The SCA-7511MK3 sold to a customer in the UK last month was noisy, so I sent it to Bakun Products for examination. The results are normal. SATRI amplifiers are susceptible to inverter-type fluorescent lamps and variable LEDs, and since the frequency band is extended, noise is picked up from the input and sent to the output. Also, in the case of a customer in the UK, we received an order with 220V, but the actual use was 230V, so that may have had an effect.
This time, by adopting a low-noise power supply for bri amplifiers, we were able to reduce the noise level to 1/10 of the conventional level. Until now, when this power supply was used, the voltage was lower at the expense of less noise, which lowered the output of the amplifier, so it could not be used in power amplifiers. This time, we had the problem solved for the time being by changing the circuit so that there would be no drop in output.
I'm glad that they respond to various details in detail! I think it's a response that is difficult for major manufacturers to do.
