If you have one of these try bypassing the mini board. I'm shocked that it sounds so much clearer and punchier than my Adcom 5400 in every regard. The change from bypassing the mini input board was huge. I forgot to mention that I had re-capped the power amp board, but has not not yet replaced to two large 15,000 uf capacitors. Removed the two 1.5K coupling resistors from the RCA connector, and then soldered the blue wires red and white wires to the RCA connectors. Did so by removing the blue wire from the gain controls to the mini boards output. To later decided to bypass the mini board entirely. But later tried swapping out the input board OP amp from an 4558 to a OPA2134, with little if no notable improvement. Didn't like the RED led indicator and that the auto turn on did not work. The sound performance was expected, but noticing the transformer and that it looked to be a high current design because doubled use of large power transistors and the heat sink size. But their sound has better clarity and transparency than many "HiFi" amps. They're Pro amps, with 1/4-inch jacks, not RCAs, and I didn't have enough adapters to use both as mono-blocks. They're Dual Mono, 100W, and can be bridged for about 200W output. I also got 2 Alesis RA-100 power amps at the same Goodwill, also for $20 each - it seems to be their standard price for a "black electronic 'thing'" they don't understand. The difference between 60W and 125W is only 3dB, not much the quality matters more than the numbers. But I'm not! The Sonance is simply a better amp. You say you're "'shocked that it sounds so much clearer and punchier than my Adcom 5400 in every regard". Even now, after the mods have been done, if you ever have time, it would help just to take the cover off, take a pic or two and indicate the Mini-Board, red LED, and other parts you bypassed. I'm an amateur, those pics would have helped. You solved the problem, possibly made it sound even better, but alas I'm not skilled enough, or confident enough, to do it, even though you make it sound easy. It was coupled with a Rotel preamp that had a "Stand-by" feature, and it was never just "Off" - this created a conflict with the Sonance's auto turn-on, which would turn itself On or Off at random, even while listening to music. but I also had problems with the auto turn-on feature. I have a Sonance 260, also for $20, and its sound is great. I'm not good enough at electronics to do it, just by following your written description. The clarity and detail ravels my I wish you'd taken pictures step by step as you did those modifications. I am still in awe of how well this amp sounds after removing bypassing that mini board. This Sonance drives the N.E.A.R's in my opinion better than the Adcom. My N.E.A.R speakers are rated for 300 watts (8 woofer). The Adcom is 125 watts, while the Sonance is only 60 watts per channel. I later also removed the red led connector from the power supply. This was last week and today I still have the Sonance as my main power amp. Then connected the amp in place of my Adcom 5400 to my N.E.A.R speakers and Hybrid Tube/Fet preamp. For the price it became a good small amplifier for one of my various small speaker systems. I picked up one of the Sonance 260's for $20.00 not long ago.
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