“Hands On” with Klippel's Nearfield Scanner || How I measure loudspeakers

Summary

このビデオでは、アランがスピーカーの測定方法を紹介しています。特に、クリッパー近場スキャナーを使用した測定プロセスを紹介しています。アランはスピーカーを測定する際の重要なポイントを説明し、ケーブルの接続、スピーカーの中心配置、マイクの位置設定などについて詳しく説明しています。クリッパーソフトウェアを使用して測定を開始し、様々なポイントを設定する方法を紹介しています。また、測定結果を分析し、スピーカーの性能を評価する方法についても触れています。

Takeaways

• 🎥 このビデオはAaronがスピーカーの測定方法を紹介するものです。
• 📐 AaronはNear Field Scannerを使用してスピーカーを測定するステップを紹介しています。
• 🔌 スピーカーを測定する際には、電源コードやXLR入力などのケーブルを接続する必要があります。
• 📏 スピーカーを測定台の中心に正確に置くことが重要で、誤った配置は測定結果に影響を与えます。
• 🎤 Aaronはマイクロフォンの位置を調整し、コンブフィルタリング効果を避けるためにアルミ管を使用しています。
• 💻 測定にはClipperというソフトウェアを使用し、スピーカーの周囲での音圧を測定します。
• 📍 カリブレーションポイントの設定は、測定の正確性に欠かせないステップです。
• 📈 測定の前にスピーカーの中心位置を確認し、測定データを正確に収集します。
• 🔊 測定中には外部からのノイズを排除するために、4回のスイープを平均化して測定します。
• 📊 測定結果をもとにスピーカーの性能を分析し、データの妥当性を確認します。
• 🛠️ Aaronはスピーカーの近場測定だけでなく、歪みテストやコンプレッションテストも行っています。

Q & A

アランはどのようなビデオを制作していますか？

アランはスピーカーの測定方法を示すビデオを制作しています。特に、CLIPPER近場スキャナーを使用した測定プロセスを紹介しています。

アランが測定に使用しているスピーカーモデルは何ですか？

アランが測定に使用しているスピーカーモデルはCali in8v2です。

スピーカーを測定する際に最初に行うべきことは何ですか？

スピーカーを測定する際に最初に行うべきことは、スピーカーをスタンドに置くことです。

測定プロセスでアランはどのようにケーブルを整理していますか？

アランはケーブルをチューブを通して整理し、そのチューブをスタンドの下まで引き延ばしてCLIPPERマシンに接続しています。

スピーカーの測定において、中心配置の重要性とは？

スピーカーの中心配置は、測定の正確性に影響を与えるため非常に重要です。もしスピーカーが中心からずれていると、測定値がずれる可能性があります。

アランはマイクロフォンのブーススタンドに何を使いましたか？

アランはマイクロフォンのブーススタンドにアルミニウム製のチューブを使い、フェルトテープで固定しました。

CLIPPER機器とその周辺機器の接続順序について説明してください。

アランはまずスピーカーをCLIPPER機器に接続し、次に外部アンプ（必要な場合）に信号を送ります。アンプからの出力はCLIPPERに返され、損失などの計算に使われます。

アランがCLIPPERソフトウェアを使用する際の初期設定とは何ですか？

初期設定としてアランはCLIPPERをオンにした後、まずCLIPPERが自らのベアリングを理解するための初期化プロセスを実行します。

アランが測定プロセスで使用するリモコンは何を使用できますか？

アランはCLIPPER近場スキャナーを制御するリモコンを使用して、マイクロフォンの位置を調整します。

アランはスピーカーのどのポイントを測定する必要がありますか？

アランはスピーカーのキャリブレーションポイント、クリティカルポイント、ツイーターポイント、参照ポイント、開始ポイントなどを測定する必要があります。

アランが測定時に使用するポイントの数にはどのような基準がありますか？

ポイントの数はスピーカーの複雑さに応じて決まり、単純なスピーカーは100ポイント程度で十分で、より複雑なスピーカーには1000ポイント以上が必要になることがあります。

アランは測定後にデータをどう使いますか？

アランは測定後のデータを使用して、KlippelのリスニングウィンドウモジュールのためのSpinoramaデータセットを定義します。また、歪みテストや近場測定も行います。

アランはスピーカーの測定においてどのような注意事項を挙げていますか？

アランはスピーカーの測定において、外部ノイズや室内のモーダル問題による影響を最小限に抑えるために、4回の平均を取ることや適切な測定ポイントの設定など、いくつかの注意事項を挙げています。

アランが紹介したスピーカー測定プロセスにはどのような利点がありますか？

アランが紹介したプロセスは、アネコイックチャMBERを必要とせずにスピーカーの詳細なデータを得ることができます。また、CLIPPER近場スキャナーはスピーカーの様々なパラメータを正確に測定するのに役立ちます。

Outlines

00:00

🔍 スピーカー測定の準備とセットアップ

この段落では、Aaronがスピーカーを測定するための準備過程を紹介しています。Calin in8v2というスピーカーを測定する際に、まずスピーカーをスタンドに設置し、電源コードやXLR入力などのケーブルを接続します。ケーブルは筒を通して下まで引き、Clipperマシンにプラグインします。スピーカーのセンターに位置させるためには、ヤードスティックを使って調整し、測定の正確性を確保します。また、マイクロフォンの位置も調整して、コンブフィルタリング効果を避けています。

05:01

📐 クリッパーソフトウェアを使った測定設定

この段落では、Clipperソフトウェアを使用してスピーカーの測定を設定する方法について説明しています。まず、クリッパーを初期化し、軸の位置を設定します。次に、様々なポイントを測定するために手動でマイクロフォンを動かすためのリモコンを使用します。キャリブレーションポイント、クリティカルポイント、ツイーターポイントなどを測定し、それぞれのポイントをソフトウェアに登録します。

10:04

🎛️ リファレンスポイントと開始ポイントの設定

この段落では、スピーカーの測定におけるリファレンスポイントと開始ポイントの設定方法について説明しています。リファレンスポイントは、通常はツイーターポイントと同じですが、特定のスピーカーではミッドウーファーとウェイブガイドの中心点になることもあります。開始ポイントは、スキャナがスピーカーに最も近づくポイントを定義し、他の測定はそのポイントから始まります。

15:04

📊 測定ポイントの決定と測定の開始

この段落では、スピーカーの測定ポイントを決定し、測定を開始する方法について説明しています。測定ポイントの数はスピーカーの複雑さに応じて変わりますが、1000ポイントから2500ポイントの間で測定します。Clipperソフトウェアを使用して測定を実行し、周波数特性を測定します。

20:04

🎵 測定結果の分析と応用

この段落では、測定結果を分析し、応用する方法について話しています。測定データを使用してスピノラマデータセットを作成し、リスニングウィンドウモジュールで使用します。測定過程で外部ノイズが混入していないか確認し、データが正しいことを確認します。さらに、歪みテストや近場測定を行い、スピーカーの性能をよりよく理解します。

🛠️ 近場スキャナーの利点と応用

最後の段落では、近場スキャナーの利点を強調し、製造業者がアネコイックチャンバーを建設する必要がない理由を説明しています。近場スキャナーを使用することで、スピーカーの性能を測定し、製品開発に役立てることができます。また、スピーカーの測定を専門家に依頼するオプションも紹介しています。

Keywords

💡ニアフィールドスキャナー

ニアフィールドスキャナーは、スピーカーの性能を測定するために使用される装置です。ビデオでは、AaronがCalin8v2というスピーカーをテストするためにニアフィールドスキャナーを使用するプロセスを説明しています。これは、スピーカーの周囲に回転しながら測定を行い、スピーカーの特性を詳細に把握することができます。

💡クリッピングマシン

クリッピングマシンとは、スピーカーの測定に使用されるデバイスであり、スピーカーに接続されたケーブルを通過させて測定を行います。ビデオでは、Aaronがスピーカーのケーブルをクリッピングマシンに接続し、測定の準備を整える様子が見られます。クリッピングマシンは、測定データを収集し、分析に役立ちます。

💡センター位置

センター位置とは、スピーカーが測定台の中央に位置している状態です。ビデオでは、Aaronがヤードスティックを使ってスピーカーを中央に配置し、測定の精度を確保する重要性について説明しています。スピーカーが中央にない場合、測定結果がずれてしまう可能性があります。

💡マイクロホンブーム

マイクロホンブームとは、測定時に使用されるマイクロホンを支えるスタンドです。ビデオでは、Aaronがマイクロホンブームにフェルトテープを巻いて、コンブフィルタリング効果を防ぐ方法について説明しています。これは、測定データの精度を高めるための重要なステップです。

💡キャリブレーションポイント

キャリブレーションポイントとは、スピーカーの測定を開始する基準点です。ビデオでは、Aaronがマイクロホンをスピーカーのツイターの先端に合わせ、キャリブレーションポイントを設定するプロセスを説明しています。これは、正確な測定結果を得るために重要なステップです。

💡クリッパーソフトウェア

クリッパーソフトウェアとは、スピーカーの測定データを収集し、分析するためのアプリケーションです。ビデオでは、Aaronがクリッパーソフトウェアを使用して、スピーカーの測定を開始し、データの確認と保存を行う様子が見られます。このソフトウェアは、スピーカーの性能を理解するために不可欠です。

💡測定配列

測定配列とは、スピーカーの周囲で測定を行うポイントの数です。ビデオでは、Aaronがスピーカーの複雑さに基づいて、空間で測定するポイントの数を決定しています。これは、スピーカーの音響特性を正確に把握するために重要な要素です。

💡スタートポイント

スタートポイントとは、ニアフィールドスキャナーがスピーカーの近くから測定を開始するポイントです。ビデオでは、Aaronがマイクロホンを適切な位置に設定し、スタートポイントを定義するプロセスを説明しています。これは、スピーカーの周囲の音場を正確に測定するために必要です。

💡リファレンスポイント

リファレンスポイントとは、リスナーがスピーカーから直接聞くポイントです。ビデオでは、Aaronがリファレンスポイントを設定し、スピーカーの設計に基づいてリスナーが最も適切な位置で音を聞くことができるようにしています。これは、スピーカーの音響特性を理解する際に重要な役割を果たします。

💡オリエンテーションベクトル

オリエンテーションベクトルとは、スピーカーの測定において、マイクロホンがスピーカーの上方または下方にあることを示すベクトルです。ビデオでは、Aaronがオリエンテーションベクトルを設定して、スピーカーの垂直方向の音場を測定するプロセスを説明しています。

💡スピーカーテスト

スピーカーテストとは、スピーカーの性能を評価するために行われる測定プロセスです。ビデオでは、Aaronが様々なスピーカーをテストし、その特性を分析するプロセスについて説明しています。スピーカーテストは、スピーカーの音質や出力、およびその他の特性を客観的に評価するのに役立ちます。

Highlights

Aaron from Aaron's Audio Corner demonstrates measuring speakers using the CLIPPER Near Field Scanner.

The video is not a tutorial but an overview of the process Aaron follows for his measurements.

Aaron is testing the Cali in8v2 speaker and explains the setup and connection process.

Speakers are placed on a stand and connected to the CLIPPER machine through a tube system to prevent wire tangling.

The importance of centering the speaker on the stand for accurate measurements is emphasized.

Aaron discusses modifications made to the microphone boom stand to avoid comb filtering effects.

An aluminum tube and felt tape are used to secure the microphone and prevent additional cone filtering.

Aaron's computer setup includes a 22-inch Samsung monitor, a Dell laptop, and the CLIPPER hardware.

The CLIPPER software is used to run the speaker tests and requires an initialization process.

The calibration point is set using a metal reference point recognized by the CLIPPER software.

Aaron explains the process of setting up the critical point bottom, tweeter point, and reference axis in the software.

The orientation vector and starting point are defined for the scanning process.

The number of measurement points can vary depending on the complexity of the speaker.

Aaron uses 4x averaging and sets the output voltage for the measurement array.

The measurement process involves the CLIPPER machine scanning around the speaker and recording data.

Aaron discusses the importance of ensuring data integrity by checking for noise and fitting errors.

Further testing includes distortion, compression, and near-field measurements for a comprehensive analysis.

Aaron shares his experience with complex speakers and the learning curve involved in setting up reference planes.

The video concludes with Aaron discussing the practicality of the Near Field Scanner for manufacturers and enthusiasts.

Transcripts

[Music]

what's up everybody this is aaron from

aaron's audio corner

and this is a video showing you the

steps or some of the steps

of how i measure speakers using the

clipper near field scanner there have

been

questions and sometimes i think people

maybe just don't quite

understand what the near field scanner

is now this isn't a tutorial

of any nature or anything like that it

really is more just a

hey here's the process that i go through

when i conduct my measurements now

in this case i am testing the cali in8v2

as you can see it's

currently on the stand behind me and i'm

going to start off with what i'll always

start off with is i take the speaker

i put it on the stand step one done

then i go through this process of

connecting all the wires so in this case

it's got the power cord

input and it's got an xlr input as well

those wires come

up through this tube and this tube

extends down to the bottom

and it runs out and those wires are

plugged into the clipper machine

clipping machine is on my computer desk

stand that's over here i'll show you

that in a second

and then that way you know when this

doohickey spins around the speaker to

measure uh the wires don't get tangled

up they're all

taken care of and sealed up in here they

come out the back

and they route into the speaker after i

connect the speaker

wires what i do is i make sure that the

speaker is centered up on the stand so

there's a metal stand right here

and i put the speaker on the stand i use

this yardstick

and i just walk around and make sure

everything is lined up well

why do i do that well it's pretty simple

if i were to

put the speaker off center and then send

this thing around and i told it the

origin point was at the center

well the measurements would be off

center so for example

uh if the speaker were let's give an

extreme example if the speaker were

pushed

two inches to the side well the

microphone center location

would be like right here

instead of at the tweeter and obviously

that wouldn't be a correct measurement i

mean that just makes sense

same thing goes for the vertical

measurement you know you want to make

sure that the speaker is

flat on the stand you don't want it to

be tilted one way or the other

i mean this is pretty common sense stuff

but make sure that you

put the speaker in the center of the

stand you just you know use your

yardstick or a

ruler or something like that and always

make sure you do that first because you

want to make sure that you set the

speaker up correctly the first

time you don't have to go back and

re-measure it another thing that i did

with this particular setup

is i'll talk to this camera over here if

you notice

the microphone boom stand thing here

it's got some

felt tape around the stand now this may

look kind of gaudy

and honestly yeah it probably is but if

you go back and look at one of my videos

i created previously and i'll put it up

here in the corner

uh what i talk about in that video is

the microphone boom that comes with

the clipboards it's more regarded for

engineering purposes

but since i'm not engineering and i'm

not r d i'm

publishing data for everybody to see i

wanted to make sure that my data is as

accurate as it could possibly be

and therefore i got rid of the little

microphone boom holder

because that was causing comb filtering

effects above like i think two kilohertz

or so

and i made sure to put my microphone

through a tube this is aluminum tube

and then i just secured it in with some

felt tape here to make sure that the

microphone stays in place but also that

there's no really hard surface edge or

anything like that that could cause

additional cone filtering so in regards

to how my

measurement system is put together it is

a-ok

i made sure to make sure that everything

was set up properly

before i even began doing my first test

just for what it's worth

after i have made sure that the speaker

is at the center of the stand

then i go to my computer setup so i'll

spin the camera around show you guys

what i'm looking at

right now and that's it now it's it's

dark but what you can see

here is my monitors it's just a 22 inch

samsung monitor i've had it for

no joke probably 14 or 15 years

seriously and then i've got a dell

laptop that i'll run

the computer stuff or the clipper

software through and then i'll show you

where the clipper

hardware is and the amplifier that i use

so

down here is the clipper box

and that's where all the ios run through

so the the power cable

the amplifier cable the signal cable all

that stuff

and if i'm doing powered speaker testing

i don't need anything else other than

this

but if i'm doing passive speaker testing

then you need an external amplifier so

in this case this is my external

amplifier

and the signal is routed to there

basically to provide

additional output comes back into the

clippers so the clipper knows what it's

going

out and uh it can account for any kind

of losses or anything like that in the

line

luckily you don't have to worry about

that uh let's see here

then i go to the clipper software so i'm

going to kick off this screen

recorder here and i've cheated a little

bit

i've already measured this speaker once

before did a couple days ago so i'm just

using the same template that i was using

before

and i'm just going to kind of quickly

show you some of the steps that you go

through to make sure everything is good

now

there's an initialization process that

you have to when you turn the clip on

for the first time or once it's been

uh disconnected from power you have to

initialize it and that

basically just gets the clipper you know

to

understand its bearings so to speak so

it says you know

uh i'm this far out in the r axis or i'm

this high up you know it you tell it the

limits that it can go

and you set it up that way it's very

simple but that's just the

initial portion of testing then you get

to

what is the calibration point this is

the second step

that you go through and in order to make

sure that you move the microphone to

each of these individual points that you

want to

set up you would go to manual movement

so now i'm in manual movement and

clipple

sends out this really neat little remote

and this remote

actually controls i'll show you

the near field scanner so

with the remote i can control

uh the different location of the

microphone so right now

you know i'm moving the microphone

inward toward the speaker but what we're

going to do right now

is start off with the calibration point

so i'm going to say well let me cancel

this first

i want to put the microphone at the

calibration point talking to you camera

so what i'm going to do

is i'm going to bring it to the z-axis

i'm going to bring the microphone down

and i'm going to get down here

and i'm going to wait until it gets to a

decent point and we'll stop it

now i'm going to switch back to the

r-axis remember i'm doing all this from

the remote

pretty neat

and okay so the calibration point is

this

metal thing right here matter of fact i

can take it out for you if you want to

see it

i'll hold it up to the camera

that's a little calibration point so it

sits inside the clipboard the clipboard

software knows where it's supposed to be

relative to the center

line and you just make sure that you're

matching it up correctly

all right now my r axis is correct it's

right over the tip of the cone

and i'm going to push this twice i'm

going to get to my z-axis

and i'm going to bring this down and set

the z-axis right on top

and actually it looks like i can back

this out just a tad

uh the other way there you go and that's

pretty much perfect so i have set up my

calibration point in the clipper

software

and this is from an old test i'm just

going to hit set new origin

at calibration point okay that's fine

uh save yeah i've already done all that

so i just need to confirm it

yeah normally what would happen uh if

this were brand new run

let me go find a camera guy if this were

a brand new run i wouldn't have these

series of

points already loaded in the software so

it's going to ask me to confirm if i'm

if i want to make sure that

these points are okay and it is normally

they're all blank and it doesn't pop up

with a confirmed symbol but

i'm just saving myself a little bit of

trouble using the template from last

time

all right now the next point that i have

to measure is the critical point bottom

and what that means is basically get as

close to the pole as you can

without hitting any wires and in this

case you can see i've got a couple wires

back here i've got them velcroed

out of place and i'm going to go

up

oop let's go this way there we go all

right i'm going to go up

i'm going to go to a point in space on

the r axis

and this would be pretty close to it now

i'm not trying to go for absolute

certainty here i'm just providing a demo

i've already done the measurement

and we're going to say this is my

critical point bottom i'm happy with

that

and the next point would be the tweeter

point

and while i'm thinking about it let me

set this back to zero

okay tweeter point i'm one more r access

i want to back this out

twitter points now i need to go up

and i need to put the microphone right

at the tweeter

and that's pretty good z-axis now i'm

going to move this inward

got to be a little bit careful here so

right now i'm just a touch too high

so what i'm going to do is i'm going to

bring it down a little bit

and that's pretty good in line with the

tweeter now i want to back it out to the

baffle

they say about five millimeters or so so

that's pretty close

put it right there twitter point

okey dokey i'm gonna skip starting point

now reference point is the interesting

one

in the clipable software you set the

tweeter point but you also set a

reference point because they can be two

totally different things for example

most two-way speakers with a mid woofer

and a tweeter

the reference point will be the tweeter

point but let's say you have a wave

guided speaker with

a large eight inch woofer and a large

waveguide

dome tweeter a lot of speaker designs

like that

their reference point like their design

axis the way that you're supposed to put

your ears

on level at is the center point between

the mid woofer and the wave guide so if

this were something like that

then my reference point would be

different than my tweeter point

but it's not like that this is a

concentric design and my reference point

is the tweeter line so i'm actually just

going to move

the uh r-axis let me check this can you

keep up where i'm at right now

uh let's see r-axis all right i want to

move the

reference point basically the tip of the

microphone

to the baffle right in front of the

tweeter well not right in front but at

the tweeter line

but in the baffle space because the

point of origin of the sound that

everything should be referenced to is

right in front of the tweeter

right on the baffle and that's what i've

done here

and i'm going to hit save

and reference axis

reference axis that's pretty easy that's

the uh that's the plane that you're

going to be listening on and most of the

time it's

you know out in front of the speaker and

in this case yeah it is out in front so

the reference axis is going to be

that way away from the speaker so i'm

just going to move him outward

some number doesn't matter how much i

move them out clippable software knows

that i've moved it in the r-axis

so i've done that orientation vector

orientation is the

above or below the speaker so the

speaker is standing up and its

orientation is

vertically so i'm going to change the

orientation vector by

moving the microphone up okay

so there's my orientation vector it's

going up

pretty simple save

now starting point is the one that um

i won't say tricky but it's just

something you kind of need to pay

attention to so starting point defines

the starting point of the cylinder that

the clipper scans around

and by that i mean the clipper point the

clipper has a point in space that says

all right

this is the closest that i'm going to

get to the speaker

you kind of define something at the

bottom down here but it's different okay

so this is the closest point that i'm

going to get to the speaker in space

and my other measurements are going to

be based from that point

or backwards if you do a dual scan uh

and that's something else that would

probably

need to be discussed later on i want to

keep this kind of simple

so in order to set that up i'm going to

set my microphone up at some point in

space

above the speaker

uh and it it's somewhat arbitrary i mean

it's not fully arbitrary

but it is somewhat arbitrary where i set

the

uh starting point the clipper software

or the manual i believe says five to ten

centimeters

uh that kind of varies for some speakers

so in

some cases what i found works better is

placing the microphone further out to

make sure that you have proper summation

of a base driver and a port or multiple

base drivers in this case i do have a

large base driver

and a pretty decent size port so i want

to put the

r-axis point pretty far out and also

another thing is i don't really want to

put the microphone too close because i

don't want to get into the point of

potentially run into some distortion

artifacts from the microphone i mean

it's spl limit i think is 130 or 140 db

so you'd have to be pretty close but i

just you know it's another risk that i

kind of stay

mindful of so now the starting point is

set let me kick this off

starting point save alrighty

and i'm going to hit ok because i've

done everything that i wanted to do

now i go into edit setup

and you normally would test the speaker

uh test the outputs so what i do is i

use 4x averaging and in this case i've

already determined that 0.2 volts gets

me about 86 db

uh at 1 meter so that's going to be my

output voltage setup and then comes the

uh measurement array so how many points

in space do you want to measure

and here's the thing about that okay the

number of points of space that you

measure

can be anywhere from like one to i don't

know probably several thousand if you

want to do that the

the more simple the speaker is the less

measurement points you need for example

a subwoofer maybe needs like 100 points

this is actually covered in the manual

pretty well so i'm

trying to recall from memory uh more

complex speakers may need

a thousand two thousand twenty five

hundred for example the jbl hdr 3800 i

think i measured either 2200 points

or 2500 points a speaker like this

1000 points of measurement in space is

enough to define the spherical

uh balloon i guess if you want to call

it that of the

sound so the sound field and then from

that i'll

extrapolate the cea or cta 2034

measurement specifications

so i've done that i've set the number of

points

already i need to run this array

and it is done and now what i would do

is i would just say start so before i

start i will need to move this phone

now what i'm going to do is i am going

to start the process for measuring the

speaker

and i'm actually just going to do a time

lapse once this thing kicks off but i'll

show you the first few measurement

points

then we'll do a time lapse and then

we'll come back now i'm going to talk

through this because as i said before

i've already

measured the speaker so we're going to

look at the results of

the measurement that i've already

conducted but i just want you to kind of

see what's going on here

so the clipable machine is going to a

starting point behind the speaker and

now it's going to come forward

and it's going to measure above the

speaker it's going to measure in a

couple different places so let's let it

do its thing it's going to be kind of

loud so cover your ears

your little click microphone or not

microphone but amplifier

worst worst worse

okay so there's five sweeps if you

counted them the first sweep is a

pre-loop it's just telling the system

hey i'm about to do some measurements so

everything afterwards

first one worst worst

everything after this first one you can

ignore then it's gonna do the four

sweeps and it's averaging those to make

sure there's no external noise worse

worst worst worst because if there's

external noise you don't want that to

creep into your measurement also it

helps to lower the noise floor

worse worse

so i'm going to let this run i'm gonna

time lapse a video on my iphone

i'll throw it in here and we'll come

back and as you can see

you know the the boom arm is spinning

around the speakers taking measurements

and in real time it's storing those off

into the clipper software and once it is

done with that what i can do is i can

take that data

and i can use it to define the uh

spinorama data set

which comes from klipple's module uh for

the listening window module so

it's one of the options in the listening

window module

and it's it's pretty much all automated

once i do that

and i verify that the data looks good

which just means that fitting error is

low

that there's no noise that creeped in

for instance like

if i was measuring overnight which i do

often and maybe a thunderstorm came

along

uh you know it could corrupt the data so

for that reason i would need to

rerun measurements and there could be

other things along those lines maybe a

very very loud car

came and parked out front of my house

and made a bunch of noise just something

like that you know you just never know

so you've always got to make sure that

the data makes sense and then once it

makes sense

i go to my next step which is to

do my distortion testing do my

compression testing

maybe my near field measurements just to

check ports driver break up

kind of get an idea where the crossover

region is let's see what else is there

i just do all sorts of other

measurements so that's how i get to

where i provide you all with the data

it is a process it does take time some

speakers are

more complex than others for example

i've got this

dan lee let me see here let me move it

out

good lord this thing is heavy

[Music]

can you see this let me check the camera

make sure you can see this

okay yeah you can see this i've got this

dan lee

sound labs this is the i think it's the

sh-50

and it is a big old speaker synergy horn

the acoustic center i can't even

remember where it is i'm gonna have to

ask tom to find out for sure

uh but yeah it's gonna be a complex

speaker i don't imagine that i'm gonna

get it right the very first time

as far as you know understanding where

the actual acoustic center is and what

makes

most sense with setting up the reference

plane i'm sure the reference plane is

probably dead center

and the acoustic center may be actually

the center of the speaker uh

or i should say you know back in the

throat of the waveguide

but it's just an example of a speaker

that's probably going to take a lot of

different measurements

to fine-tune especially when it spins

around at the back i'm going to have to

set my averaging

to at least 4x because if i don't do

that what's going to happen is

the noise in the room by noise i just

mean modal issues

are going to creep up they're going to

corrupt the measurements because i doubt

there's been

much energy thrown to the rear of this

speaker i don't know

i'd guess that it's probably not quite

omni at very low frequencies but it

could be i just

i truly don't know so that's why i say

that

some of this stuff is a learning

experience for me but i really just

wanted to share with you all

a an idea of what it takes to do the

speaker measurements and

i don't want to say that the near-field

scanner is idiot-proof certainly i've

run into

issues and especially learning curves

but i mean within like two or three days

i was off to the races and measuring

stuff and i've learned some things along

the way to help me get better at it

the folks at klipple have been great

answering my questions and

so i mean yeah it's it's a great

incredible piece

uh if you are a manufacturer and you're

watching this video

you may not be but if you are and you're

thinking you know i've got to build an

anechoic chamber you don't have to build

an edict chamber my garage i don't know

this is what 22 by

maybe 14 22 feet long 14 feet wide

uh i've got the near field scanner so

the one thing that i will

note is the ceiling is 10 feet so that

means that with the base

z axis which is the height portion of

the near field scanner

i can only measure speakers about as

tall maybe around three feet tall

36 inches so roughly a meter tall but

the cool thing

is that i added the rx r-axis extension

brings the r-axis out even further

another

about half a meter and because of that

what i can do and i've done this

i can lay tall tower speakers on their

side so i can measure up to about

i'm going to say maybe 50 inches is

probably

pushing it 50 inches tall lay a speaker

on its side and measure it that way

and it's cool because in the clipper

software all i've got to do is say

the orientation vector instead of up and

down now it's left and right

super easy super super easy um but if

yeah if you're a manufacturer and you're

looking at something like this

it's to me it's a no-brainer uh or

alternatively you can send your speaker

to warquin if you're looking for r

d work one up in minnesota michigan

one of those places up that way because

i'm in alabama so it's up that way

send it up there i don't know what they

charge but it's not going to be the full

price of a near field scanner

probably a couple iterations to help you

really nail down the process of

what the speaker that you're trying to

achieve should be doing

uh and those guys are great at that kind

of thing i mean they're they're

engineers so they're gonna be able to

provide you with

advice on what to do but enough rambling

for me

i hope that that gives you a good idea

of my process

how the near field scanner works and

that's it so

i will talk to you all later i hope you

have a great one bye