Power Class D500 NSTR

Summary

In this detailed review, the presenter evaluates the Class D 500 amplifier from NSTR Electronics, discussing its technical specifications and setup procedures. The testing includes various voltage levels, highlighting performance stability and sound quality. At lower voltages, the amplifier delivers clean audio with minimal noise, although the bass response is noted to be lacking. The review contrasts Class D with Class AB amplifiers, expressing a preference for the latter's warmth. Overall, the Class D 500 is deemed a valuable option for home audio systems, with recommendations for cautious voltage usage to prevent damage.

Takeaways

• 😀 The D500 amplifier from NSTR Electronics uses a TL074CN chip and specific MOSFETs (IRF640, IRF9640) for its operation.
• 🔌 Proper connections include speaker plus, speaker minus, and ground, as well as input configurations for balanced audio signals.
• ⚡ The amplifier operates within a voltage range of 24 to 65 volts DC, with recommended AC input voltages between 16VAC to 45VAC for optimal performance.
• 🔊 During testing, clean audio output was achieved at lower voltages (20VAC to 25VAC), with no noticeable noise or hum.
• 🔥 At higher voltages (35VAC), the amplifier exhibited heating issues, particularly with the resistors and MOSFETs, necessitating caution.
• 🛑 Users should avoid exceeding the recommended voltage specifications to prevent damage to the amplifier and associated components.
• 🎛️ The speaker configuration tested included 12-inch and 6-inch speakers in parallel, providing a 4-ohm load for the amplifier.
• 🎶 While midrange sound quality was satisfactory, the bass response was noted to be less pronounced compared to Class AB amplifiers.
• 💡 The review emphasizes the importance of starting with lower voltages during setup and gradually increasing to avoid potential issues.
• 💰 The D500 amplifier is considered a cost-effective solution for home audio, suitable for casual listening rather than high-demand applications.

Q & A

What is the main purpose of the video?

The video is a review of a Class D 500-watt amplifier from NSTR Electronics, detailing its specifications, setup, and performance.

What components are used in the amplifier?

The amplifier uses the TL074CN and MOSFETs IRF640 and IRF9640 among other components.

What type of input connections does the amplifier support?

The amplifier supports balanced inputs and RCA inputs, allowing for various connection options.

What is the voltage range recommended for the amplifier's operation?

The recommended voltage range for the amplifier is between 24 to 65 volts DC, with input from a transformer supplying between 16 to 45 VAC.

What were the findings during the testing of the amplifier at different voltage levels?

At 20 VAC (26 VDC), the amplifier performed well with clear sound. However, at higher voltages like 35 VAC (47 VDC), it generated excessive heat and struggled to operate effectively.

What is the optimal operational voltage for this amplifier according to the review?

The optimal operational voltage for the amplifier is around 25 VAC.

How does the reviewer compare Class D and Class AB amplifiers?

The reviewer expresses a preference for Class AB amplifiers due to their perceived sound quality but acknowledges that Class D amplifiers are more affordable and easier to use.

What are the main advantages and disadvantages of the Class D amplifier discussed in the video?

Advantages include its affordability, ease of use, and low noise levels. Disadvantages include a weaker bass response and potential overheating at high voltages.

What recommendations does the reviewer give for using the amplifier?

The reviewer recommends starting with lower voltages and gradually increasing them while monitoring the amplifier's performance to avoid damage.

What is the price of the amplifier and what does the reviewer suggest for a stereo setup?

The amplifier is priced at 170,000, and the reviewer suggests purchasing two units for a stereo setup.