Multi-channel amp suggestions

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a discrete amplifier budget is often made up from 30% for chassis, 30% for amplifier, 30% for PSU & heatsink, 10% for hardware.

If one substitutes a chip for a discrete amplifier then the budget for the amplifier parts drops to 10% to 20% rather than 30%.
Your new budget should be around 35% chassis, 35% PSU & heatsink, 12% hardware and 18% for chip based amplifier.

Divide your $400 accordingly and see where your money can stretch to.
 
Class A construction costs are not insignificant requiring both large heatsinks, lots of PSU Capacitors, and large expensive high VA rated transformers.

The Class D Hypex modules are used in Commercial Channel Island amplifiers, and they also get a good review here: Hypex UcD180AD [English]
Built like this dual mono construction, after exchange rate conversion, I'm not sure how close to $500 they will be, but look like a good option if you need 5 channels eventually as they will run cooler than Class A or Class A/B.

I am interested in the ER18DXT's myself so hopefully you will comment on their sound.

I have only built a pair of 100W Aleph's and a LM3875 Chip amp.

I don't think you can build a pair of 100W Aleph's for $500, and I don't think the 30W Aleph's will be enough power for the quoted 84-85dB/2.83v sensitivity of the ER18DXT.

I would like to try the UcD180HG with HxR at some point myself.
 
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