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Old 31st October 2010, 05:12 PM   #11
gil1 is offline gil1  United States
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Quote:
Originally Posted by sakis View Post
yeap ...i will agree with the above ...P2500 is made like that ... a classic AB amplifier switable for home listening "free" enough for hifi use , first few watts is in class A like all class Ab amps ( even though bias is quiet low and could be boosted a bit for home use and add to that a bit of temperature more ) and yes ...its made with quite good quality parts and yes ...again has protection methods that are not enough for this range of power resulting a reputation about these amps that are rowbust quality amps but will not forgive mistakes

good thing is that the protection methods will never kick in to the signal at hifi home use ( low power) but still exist in the signal path

i would say yes ... regarding this pro audio amp !!!

kind regards sakis
And how would you suggest to increase the bias and how much? I adjusted the idling current to specs and the DC is where it should be.

At the moment I think I will disconnect the fans since the unit runs very cool (actually cold to the touch) but I still like to know if there are any adjustments I can make for lower volumes, all my other home hi-fi amps get very warm at moderate to low volumes.
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Old 31st October 2010, 06:49 PM   #12
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according to the service manual (which by the way is available email me if you want to have it ) its 15mv+-2mv across t TP 1 and TP2 check the rail voltage check the emmiter resistors value and do the math to see how much this is

amplifier like that could easily work with idles of 100 200 or even more milliampers but if it sound better after that its up to you to find out

make small changes taking one step at a time to see how it goes ... tune it for 15 mv then go to 25 for example to see if it makes audible diference .... If you do so double think before removing the vents ...things might get pretty warm

regards sakis
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Old 31st October 2010, 08:00 PM   #13
gil1 is offline gil1  United States
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Quote:
Originally Posted by sakis View Post
according to the service manual (which by the way is available email me if you want to have it ) its 15mv+-2mv across t TP 1 and TP2 check the rail voltage check the emmiter resistors value and do the math to see how much this is

amplifier like that could easily work with idles of 100 200 or even more milliampers but if it sound better after that its up to you to find out

make small changes taking one step at a time to see how it goes ... tune it for 15 mv then go to 25 for example to see if it makes audible diference .... If you do so double think before removing the vents ...things might get pretty warm

regards sakis
Thanks Sakis, I recently set it to specs 15 mv but will try a bit higher and see what happens, I guess I can keep the fans going if I up the idle current.
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Old 31st October 2010, 08:46 PM   #14
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I've used a few smaller amps. An ab international 600a (some hiss and needed 4vrms for full output), altec 9440a (worked great), crown psa2 (again great), but other pa amps tend to sound grainy and glassy (crown dc300a and series 2). As a sub amp (dc300a) when I bridged the amp, the sub (18" in a keele w-bin) sounded much better than it did using 1 channel (600wrms vs 150 wrms), and not just at extreme levels, it was weird. My friend said that maybe I was clipping it and I had no idea.

The trouble with pa amp is they tend to run high feedback and the protection circuitry often harms the sound quality.

Norman

Last edited by norman bates; 31st October 2010 at 08:49 PM.
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Old 15th September 2011, 12:49 AM   #15
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I run three crown xti 2000,4000,6000 as a home/shed stereo.No problems except desire for four way instead of three.midd range amp from them but that was within my budjet.Have beeen doing a few sound reinforcement gigs.All good fun and interesting.I think HEADROOM is a very important aspect of it all,I run as high impeadence load as I can afford to keep distortion numbsre down a bit.I'm not a fan of Low frequency/low impeadence combination for saftey reasons.
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Old 15th September 2011, 02:23 AM   #16
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I have also run the AB international Precedent amps, as well as the Altec amp. Both sounded good, with the Altec doing a superb job on the bass.
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Old 19th September 2011, 08:34 PM   #17
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I started using a EP4000 for my sub this week. If a driver can take 400W RMS (PD.12SB30) very few home amplifiers can supply that, especially at low cost. Slightly overkill though the most I can bear before the rooms falling apart is 100Wish.

*not the subs in my sig they would die it's a new tapped horn

*no problems with hiss or background noise apart from fan, no problems with audio quality.

**I think the EP4000 is Class H with the upper rail at least +/-141V
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Last edited by kipman725; 19th September 2011 at 08:50 PM.
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Old 20th September 2011, 07:03 AM   #18
dangus is offline dangus  Canada
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The AB Precedent Series 900A that I own has a very noisy fixed-speed fan; I've never used it at home. IIRC there are locations on a circuit board for temperature-controllinga fan, perhaps on a different model. I don't know for sure that this is the stock fan; when I got the amp, the fan had seized, so I replaced it with the same model. The air path is unusual: fan is on the side sucking in; air is blown out the back through a narrow slot and directed over the heatsinks. Cutting away the slot grille and using a wire grille should reduce the siren effect, and implementing variable speed would help. And maybe for home use the fan could be safely disabled altogether or replaced with something slow and quiet just to keep the inner temperature down.
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Old 4th October 2011, 02:56 AM   #19
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I have a Qsc RMX2450 on subs and a Mackie 1400i on tops..in the entertainment center in my living room. the Qsc fan is loud, whereas the Mackie is so quiet, the only way to know it is running is to hold my hand on the side vent and feel for airflow. Sonically, I love the Mackie..and like I said, the QSC does it's work on the subs..
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Old 4th October 2011, 04:19 AM   #20
taeedy is offline taeedy  China
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Specifically to Charles Darwin, may I ask, what are you using as an active crossover, please.
Taeedy.
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