Telstar said:
I'd also like to know this! The Behringer has a little more power it appears, but then some are saying it's capacitor coupled via the supply caps, which arn't that big. Mabye the Alesis is too though?
In independent tests the A500 measures about 120/8 and 180/4.Dr.EM said:
What do you mean by "capacitor coupled via the supply caps"?
It seems to me, an input limiter-compressor shown on the schematic was designed by Peavey engineer (Michael, AFAIR) for a bass guitar amp, and may be patented...
Brett said:
i've got one, but i can confirm that it is exactly the same as the QSC RMX 2450. ok, some components are different, but that does not affect the functioning of the device, only the cost 😛
the QSC schematic set is complete, the behringer contains only one channel. so use the behringer for the correct numbering and the QSC for everything else.
Brett said:
From audio asylum link posted earlier:
"maybe it sounds the way it dose because it’s a cap coupled bridge amp…let’s just add up the clues…no center tap off the toroid (single 52 volt rail), the big caps +/- connect to the positive output post, and there is no signal path for bridge mode (in mono channel 2 runs as a current mirror), four power devices."
I can't quite remember how the topology works but it uses a single polarity supply and somehow utilises the storage caps as coupling also. Most modern amps are dual polarity, DC coupled, which I assume is preferable? That said, it measured very flat down to infrasonic frequencies so perhaps it isn't a big problem. I'd only be using it for subs, a good damping factor is nice though!
If you actually look at the A500 schematic you'll see it is the same topology used in the EP1500/2500, QSC RMX, and Alesis amps with + and - voltage rails. The output is AC coupled through the power supply caps, but it is not a single rail design.
Hi,
Not to be picky but the EP2500 (and QSC RMX 2450) has the transformer center tap connected to speaker output. These amps are consequently DC coupled just as much as a 'normal' topology without output cap.
Not to be picky but the EP2500 (and QSC RMX 2450) has the transformer center tap connected to speaker output. These amps are consequently DC coupled just as much as a 'normal' topology without output cap.
The 2500 does have a center tap. Because the rail voltages are switched on demand, symmetry of the rails cannot be guaranteed without it. With a normal class AB output stage, like the 500 or 1500, a center tap is NOT needed. One could be used if you like.
Without the center tap, the caps do provide AC coupling. But the coupling is inside the feedback loop so it doesn't cause a roll-off in the bass. The input coupling cap actually does this. If the output caps are small, it does affect the clipping behavior at low frequency. And it would do that center tap or no center tap.
Without the center tap, the caps do provide AC coupling. But the coupling is inside the feedback loop so it doesn't cause a roll-off in the bass. The input coupling cap actually does this. If the output caps are small, it does affect the clipping behavior at low frequency. And it would do that center tap or no center tap.
Hi,
Yes, and you can run a 'normal' output stage without connected centertap as well by the very same reasons as you mention for the flying rail topology.
There is no argue but EP1500 has AC coupled output stage and EP2500 has not. And as you say it does not matter as it is inside the feedback loop. In this case, available power in lower frequencies will depend on power supply capacitance regardless AC coupling or not.
Yes, and you can run a 'normal' output stage without connected centertap as well by the very same reasons as you mention for the flying rail topology.
There is no argue but EP1500 has AC coupled output stage and EP2500 has not. And as you say it does not matter as it is inside the feedback loop. In this case, available power in lower frequencies will depend on power supply capacitance regardless AC coupling or not.
I'm very much interested in the schematics of the A500. Can anyone please email it to me at jojod818@yahoo.com
Thanks!
Thanks!
done, forwarded them.
they are the same as the qsc rmx2450 (i was able to do various repairs on the ep2500 with those schematics. some components have a different value, but the schematic is really the same)
they are the same as the qsc rmx2450 (i was able to do various repairs on the ep2500 with those schematics. some components have a different value, but the schematic is really the same)
A500 for a sweet price
Did you guys see this-
A Behringer A500 is normally <$200.
But if you want to you can spend $3500 for one. And its "discreet." Try to DIY that.
Linn Audio NH
And if that is too much the next amp down the page is the $158 Dayton APA 150 for $1950.
Did you guys see this-
A Behringer A500 is normally <$200.
But if you want to you can spend $3500 for one. And its "discreet." Try to DIY that.
Linn Audio NH
And if that is too much the next amp down the page is the $158 Dayton APA 150 for $1950.
Hi 🙂
If anyone is still watching this thread, I would very much like a copy of the A500 schematic as I am about to start modding mine.
t e c h n o b e a r a t b t i n t e r n e t d o t c o m
Many thanks.
Chris
If anyone is still watching this thread, I would very much like a copy of the A500 schematic as I am about to start modding mine.
t e c h n o b e a r a t b t i n t e r n e t d o t c o m
Many thanks.
Chris
I know this is off topic...
but anyone has the schematic for the new Behringer amps ??
Mainly the 2009 model as i heard there were a few changes made in the EP2500 and EP4000 is supposed to be a Class H amp :thumbup:
but anyone has the schematic for the new Behringer amps ??
Mainly the 2009 model as i heard there were a few changes made in the EP2500 and EP4000 is supposed to be a Class H amp :thumbup:
hi all,I need schematic behringer ep1500 please send to may email at asuservice@ymail.com,with regards asuservice
