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Just curious, any thoughts on this?
difference between EP4000 and EPX4000?
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i see the EPX is class-h type amp, with the benefit of "switch-mode" power. how does this stack up for sub duty vs the standard ep4000's class a/b topology?
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venturing from standard class A/B design always gets me concerned. Not sure why, ive always seemed to prefer that over D, but i dont know if ive ever heard class H
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All class H is is an AB1 or AB1G amp with a tracking power supply. Yamaha have been making them for years.
The main advantage to it over the same type with a linear (just to annoy Bob Lee) mains freq PSU is no bulky mains transformer and the weight it brings. My new generation Yamaha amps are about half the weight of the old units, but that makes no difference in a typical fixed installation.
All class H is is an AB1 or AB1G amp with a tracking power supply. Yamaha have been making them for years.
The main advantage to it over the same type with a linear (just to annoy Bob Lee) mains freq PSU is no bulky mains transformer and the weight it brings. My new generation Yamaha amps are about half the weight of the old units, but that makes no difference in a typical fixed installation.
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good to know, so i guess really the only difference is that one has the transformers and the other is switch mode, not sure what this means as far as performance goes, but both claim "ATR" accelerated transient response, so not sure if there is a difference at all.
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Question: I replaced the fans to a quiter units as per this thread http://www.hometheatershack.com/foru...0-fan-mod.html . I use the amp in stereo for dual subs, one per channel. Now I have a reduced signal on the 1st channel and a hum in the subwoofer. Any ideas????
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Are you using an eq?
| Originally Posted by bsoko2 Question: I replaced the fans to a quiter units as per this thread http://www.hometheatershack.com/foru...0-fan-mod.html . I use the amp in stereo for dual subs, one per channel. Now I have a reduced signal on the 1st channel and a hum in the subwoofer. Any ideas???? |
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I have looked this up and couldnt find any info on it being class g when I googled it. Even when I google "ep4000 class g" it still comes up with results saying class h.
| Originally Posted by A9X-308 The EP2500/4000 are G. They simply rail switch and do not have a tracking PSU. |
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Anti Mode on LFE going into the amp. I have undone the Anti Mode and still get the same results with the reduced siganl and hum. So now that I changed fans I probably blew the warrenty. Anybody recommend a good 2 channel amp with 2 ohm modes for one sub with dual drivers (4 ohm drivers) per channel????
Originally Posted by Mpray1983  Are you using an eq? |
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I doubt it is the amp...how do u have it connected? Y-cable or do you have dual subwoofer outs. Where do you plug your amp into? Is there other Plugs in the same outlet? Unplug the coax and see if the hum goes away. A simple fix for a hum is a .75 3to2 plug adapter. By removing the ground you remove the hum. Most don't recommend it but at least it will get you started.
| Originally Posted by bsoko2 Anti Mode on LFE going into the amp. I have undone the Anti Mode and still get the same results with the reduced siganl and hum. So now that I changed fans I probably blew the warrenty. Anybody recommend a good 2 channel amp with 2 ohm modes for one sub with dual drivers (4 ohm drivers) per channel???? |
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I put the 26cfm fans in my 2 EPX4000's on Monday and do not have a problem so far. I did use new connectors on the new fans and just plugged them back into the board after removing the goo from the stock fan connectors. I also used rubber mounts when reinstalling. They are a lot easier than screwing the fans into place, plus they can make the fans even quieter. How are you providing the amp with a signal? Make sure you have the setup switches in the back correct. Unless you somehow physically damaged one of the circuit boards I dont see how your problems could arise. I believe that if you are feeding both channels the same signal mono mode would be apropriate. Then only channel 1 or 2 needs the input signal as I understand.
BTW anyone using these in bridge mode the channel 2 gain seems to have no effect. I set my channel 2 at the lowest setting as recommended in the EP4000 manual. The EPX manual is not to discriptive on bridge mode.
| Originally Posted by bsoko2 Question: I replaced the fans to a quiter units as per this thread http://www.hometheatershack.com/foru...0-fan-mod.html . I use the amp in stereo for dual subs, one per channel. Now I have a reduced signal on the 1st channel and a hum in the subwoofer. Any ideas???? |
BTW anyone using these in bridge mode the channel 2 gain seems to have no effect. I set my channel 2 at the lowest setting as recommended in the EP4000 manual. The EPX manual is not to discriptive on bridge mode.
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I am having a blonde day, so... My recollection from the schematic as G, but the QSC it's supposedly a clone of is H. I can't find my copy here, so it might be on the backup. I'll look tomorrow.
| Originally Posted by Mpray1983 I have looked this up and couldnt find any info on it being class g when I googled it. Even when I google "ep4000 class g" it still comes up with results saying class h. |
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where do you order the fans from and is it as simple as pulling the cover off, unplugging one fan and plugging the new fan in? and mounting of course. Is there any soddering required?
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