Second amp needed?

[bmccord]

Hey all, it has been at least a year since I have been on here. I build a sub a couple years ago consisting of one 15" TC-3000 (I think, it was the Huge one) and two of the 15" Passive Radiators tuned to about 19 HZ and with room gain it will dig down a little lower. Anyway, I have been powering it with a Europower EP2500 and it has always started to hit the clip limiters way before stressing the sub. I have the quad VC wired in series which nets somewhere around 8 ohms. My only other option on the driver would net around 2 ohms and I didn't want to stress the amp too much.

Long story short, I was thinking of adding a second EP2500 and splitting 2 voicecoils per amp. Anyone see a problem in this? I cannot remember each vc rating off hand (I would have to dig up the box that has all the papers, specs, box/wiring calcs, etc in it) but would this work? These amps will take 4 ohms just fine. Thanks again.

More info I found on another post:
I have a 15” TC Sounds TC-3000 with twin 15” TC-VMP’s (passive radiators) tuned to 16 Hz in a 4.2 cubic foot enclosure. The TC-3k is a quad 1.4 ohm DCR (2 ohm Nom) voicecoil driver. After wiring my TC-3k in all series to net 5.6 ohms DCR (8ish Nom.) I have found that I have to turn the amp up 3/4 of the way and boost my LFE output to +4 (to bring the voltage up to what the EP2500 likes) in order to get the good healthy bass I like. The amp, a Behringer EP2500 is bridged as well.

edit-looks like I need to update the sig a little...and I guess the driver was listed right there....wow, I am off my game in the HT world.

 

[AVRat]

Since the VCs are roughly 2 ohm nominal, have you tried two in series (4 ohms) running off the amp in stereo parallel mode. This should double the power to the drivers.

EDIT: Just checked the specs on the amp again to make sure I'm not blowing smoke. OOPS!! It definitely doesn't double the output going from 8 to 4 ohms in stereo mode.

It does seem that a second amp would be best. But I'm also wondering if your Yamaha receiver is providing the proper gain to the amp? Perhaps something like an Art Cleanbox would help.

 

[WmAx]

Hey all, it has been at least a year since I have been on here. I build a sub a couple years ago consisting of one 15" TC-3000 (I think, it was the Huge one) and two of the 15" Passive Radiators tuned to about 19 HZ and with room gain it will dig down a little lower. Anyway, I have been powering it with a Europower EP2500 and it has always started to hit the clip limiters way before stressing the sub. I have the quad VC wired in series which nets somewhere around 8 ohms. My only other option on the driver would net around 2 ohms and I didn't want to stress the amp too much.

Long story short, I was thinking of adding a second EP2500 and splitting 2 voicecoils per amp. Anyone see a problem in this? I cannot remember each vc rating off hand (I would have to dig up the box that has all the papers, specs, box/wiring calcs, etc in it) but would this work? These amps will take 4 ohms just fine. Thanks again.

More info I found on another post:
I have a 15” TC Sounds TC-3000 with twin 15” TC-VMP’s (passive radiators) tuned to 16 Hz in a 4.2 cubic foot enclosure. The TC-3k is a quad 1.4 ohm DCR (2 ohm Nom) voicecoil driver. After wiring my TC-3k in all series to net 5.6 ohms DCR (8ish Nom.) I have found that I have to turn the amp up 3/4 of the way and boost my LFE output to +4 (to bring the voltage up to what the EP2500 likes) in order to get the good healthy bass I like. The amp, a Behringer EP2500 is bridged as well.

edit-looks like I need to update the sig a little...and I guess the driver was listed right there....wow, I am off my game in the HT world.

Your sub has quad 2 Ohm VCs? Wire 2 in series to get 1 4 ohm tap. Then the other 2 in series to get another 4 Ohm tap. Use one Ep2500 per tap in bridged mono. Just be sure to set the levels using a volt meter so they are set exactly the same. 4000 watts is about the ideal power for that driver and that's what you'll get with two ep2500s bridges mono into a 4 ohm load each. However, note that each Ep2500 really needs a dedicated house circuit.

-Chris

 

[bmccord]

That is fine. I have triple filter and stabilized home run 20 amp circuits to my HT room. These amps are hungry. With my plasma in a bright scene and the audio up at reference during an explosion the entire system will pull over 23 amps during a spike. I my just order another EP2500...I am thinking of running my mains off an EP1500 as well. The yami amp just doesn't cut it.

 

[WmAx]

That is fine. I have triple filter and stabilized home run 20 amp circuits to my HT room. These amps are hungry. With my plasma in a bright scene and the audio up at reference during an explosion the entire system will pull over 23 amps during a spike. I my just order another EP2500...I am thinking of running my mains off an EP1500 as well. The yami amp just doesn't cut it.

Hell, I say get an Ep2500 for the mains too. May as well. You can get one for around 280 new if you use the price match function with zzounds.com and give them the price, link and phone of a competitor with super low price. Ep1500 to me has no purpose since you can get Ep2500 for about same price or cheaper, and the Ep2500 is better in every way as compared to the Ep1500.

-Chris

 

[highfigh]

I'd like to ask three questions.

How large is the room you're using for this?

How loud is it?

How long do you expect your hearing to last?

 

[bmccord]

I'd like to ask three questions.

How large is the room you're using for this?

How loud is it?

How long do you expect your hearing to last?

1) The room size is in my sig.

2) I suppose it is not loud enough

3) It is a limited use system so I like to get the most out of it when I use it.


I may just order a couple more EP2500's. What is the easiest was to balance two amps going to the same driver? Sin signal and measure the output until they are both the same?

Thanks,

Brett

 

[WmAx]

1) The room size is in my sig.

2) I suppose it is not loud enough

3) It is a limited use system so I like to get the most out of it when I use it.


I may just order a couple more EP2500's. What is the easiest was to balance two amps going to the same driver? Sin signal and measure the output until they are both the same?

Thanks,

Brett

Just use a digital multi meter. Play sine wave bass tone, and adjust the gain on both amps until the voltge is identical.

-Chris

 

[bmccord]

Sounds good, thanks Chris.

As for the loudness, my media room opens up to about 23,000 cubic feet of space so it eats up some of the sound.