Hey Guys, I have been wanted to experiment with a newish type of amplifier this IMO looks to be good value for what you get...the idea has been to find a hi power watt amplifier but use small wattage and keep the distortion low...
please tell me what you think..
Sure Electronics AA-AB32291 2x250W IRS2092 Class-D Amplifier Board 844632096730 | eBay
Thank you for your time
Lawrence
please tell me what you think..
Sure Electronics AA-AB32291 2x250W IRS2092 Class-D Amplifier Board 844632096730 | eBay
Thank you for your time
Lawrence
Without dwelling on what people sometime believe, the promises in the advertisement are credible from my quick calculations.
The power MOS-FETs are of a 200V type with 100mOhm saturation impedance. If we for a moment look at the TDA8954 from NXP as reference. The TDA8954 is stated to be able to handle up to 420W! (BTL / 8 Om) with 110mOhm/105mOhm switches. NXP is serious with specifications and the cooling of the TDA8954 chip is less good than for two discrete TO220 MOS-FETs.
The TDA8954 can only handle +/-42.5V so it has to be configured for BTL to get such high output power.
The MOS-FETs used for the amplifier discussed can theoretically handle +/-100V. The specifications for the amplifier is rather unclear on supply voltage, but in-between 65V and 80V should be possible as maximum rail voltage.
Let's be prudent and use 65V and for maximum modulation even just 60V. 60Vpeak will leave above 40Vrms. 40Vrms in 8 Ohm leaves 200W (clipping point, as a conservative estimate).
500W at 10% THD! Very few will like to listen to 10% THD at 500W. The 1% THD specification of 2x180W is more useful. And, with the voltage handling ability (assuming all the capacitors have sufficient voltage rating), 180W seems credible. Sound quality - I'm no expert.
Evidently, no 2x180W without the right power supply. The advertisement mentions a regulated power supply!
The power MOS-FETs are of a 200V type with 100mOhm saturation impedance. If we for a moment look at the TDA8954 from NXP as reference. The TDA8954 is stated to be able to handle up to 420W! (BTL / 8 Om) with 110mOhm/105mOhm switches. NXP is serious with specifications and the cooling of the TDA8954 chip is less good than for two discrete TO220 MOS-FETs.
The TDA8954 can only handle +/-42.5V so it has to be configured for BTL to get such high output power.
The MOS-FETs used for the amplifier discussed can theoretically handle +/-100V. The specifications for the amplifier is rather unclear on supply voltage, but in-between 65V and 80V should be possible as maximum rail voltage.
Let's be prudent and use 65V and for maximum modulation even just 60V. 60Vpeak will leave above 40Vrms. 40Vrms in 8 Ohm leaves 200W (clipping point, as a conservative estimate).
500W at 10% THD! Very few will like to listen to 10% THD at 500W. The 1% THD specification of 2x180W is more useful. And, with the voltage handling ability (assuming all the capacitors have sufficient voltage rating), 180W seems credible. Sound quality - I'm no expert.
Evidently, no 2x180W without the right power supply. The advertisement mentions a regulated power supply!
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