Alesis reference amps in home stereo setup?

[georgehifi]

OK, let`s ask GOD see if he`s listening, Nelson can you tell us why you have not used switch mode power supplies in your X or XA series power amps.

Thanks George

[Eva]

Of course, because audiophiles and subjectivists have their own philosopy telling them not to buy anything with PWM inside, and of course this would bring little profit, bad reputation and even bankrupt for any manufacturer triying to use PWM techniques

The business works this way, audiophiles and subjectivists expend huge amounts of money, manufacturers design attractive gear to get large profits [and everybody is happy ]

Specifications and performance don't matter, even 20% THD amplifiers working in open-loop with 0,5 damping factor and speakers placed randomly in an untreated reverberant room sound great to audiophiles and subjective people [the more expensive, fashioned and bulky the gear, the better the 'subjective experience']

As somebody says in its signature : "If it still does`nt sound any good, you have`nt spent enough money."

[georgehifi]

Your kidding Eva, manufcturers of high end power amps would love to use switch mode power supplies, the savings are massive, and audiophiles will welcome lighter, cheaper amps.
You yourself said your not an audiophile, does that mean? you do`nt hear to good? and that`s a statement not a question.
Cheers George

[RussianBlue]

Originally posted by georgehifi

If you want a stop gap amp that you`ll get your money back on get a second hand Yamaha P-2200 or P-2100 proper power supplies heaps of grunt 250rms 8ohms and cheap, their the only ones that come from that studio/pa type of amp that`s ok for hifi use (no fans, generous external heatsinks, big power supply 25kgs). their built to take a hammering and can almost double their wattage into 4ohms, they also have Alps Black Beauty gain controls at the input, the perfect passive for a cd player. You should be able to pick one up in tatty condition for $100.
Cheers George

Thanks for the suggestion on the Yamaha. IYO, what kind of DIY improvements could be done to this amp? I also have a 2050, which I use for the tweeters.

Cheers

[georgehifi]

Quick improvement on the P2200, would be to up the bias so the heatsinls are warm to touch at idle. This will improve the sweetness of the amp. For zero dollar outlay.
The second improvement i made was to double the power supply caps in value, this had to be done with a separate outboard box as there is no room left inside for more caps, should say keep the conecting lead as short as possible and use very high amperage lead, this mods makes the bass rock solid. (this mod is going to cost you for the caps, and box)
As for the circuit i would love to direct couple the input, but never got around to doing it, that would give the amp more transparency and also kick the bass along some more.
As for the rest of the circuit, at a quick glance it looks ok.
Cheers George