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Looking for suggestions for 7 channel amp and a second amp to run 4 subs

post #1 of 16
Thread Starter 
Hello,

I'm hoping for some help selecting a new 7 channel amp to drive the 7 speakers in my set up. I'm also looking for a second amp to drive my subs. Details below.


This HT has 7 in-wall speakers installed. They are Proficient Audio Systems W850 with the spec below.

I've currently removed a flying mole cascade that I was using as it didn't have the power needed for the LCR and was clipping when pushed. I'm currently demoing a Lexicon 7 channel GX7 but it has some cons I'm not sure I can "fix" or live with (details in my thread). The Lexicon is around 3k but I want to make sure I'm not missing out on something better for the same or a bit more money. The AVR linked to the 7 channel amp is a Pioneer Elite 82 VSX.


• 8" Kevlar® Woofers
• Frequency Response: 28Hz - 22kHz
• Cast Magnesium Woofer Baskets
• Impedance: 8Ω
• 1" Pivoting Aluminum Dome Tweeters
• Sensitivity: 92dB 1W/1m
• ±3db Bass & Treble Contour Switches
• Dimensions (H x W x D): 14-7/8" x 10-1/8" x 3¾"
• Power Handling: 175 Watts

I'm also looking for a new another new amp that will take the Crown and Behringer Amp's out of my rack. I'm hoping to get a single amp solution that will drive all 4 of my earthquake Thor's to handle the subs. My issue with the crown and behringer is that the fans are too loud other then that they work fine I've never had any issue with them. However I'm striving to make a near silent rack and both of these are the loudest things I currently have in the rack so I want them replaced. I also would like to remove the 2 amps both driving 2 subs to a single amp driving all 4 ideally to free up some space, increase cooling etc...

This second amp would need is to drive the 4 x Earthquake Thor Subs with the spec below:

Recommended Amplifier Power : 100-300 Watts
Frequency Response : 18-160Hz
Sensitivity : 89dB
Impedance : 4-ohm
Active Driver : 10" long throw SWS sub-woofer
Cabinet Design : Passive

My wish list:

Both Amps must be quiet, hopefully fan less but if a fan is installed ideally it's in the low 20 db range.

7 Channel Amp ideally is $5k or less and 6 rack spaces or less

The sub amp for the 4 subs is $3k or less and 5 rack spaces or less

(power supplies are 20 amp for all equipment)


Thanks,
Calvin
post #2 of 16
Why not go for an Emotiva or Outlaw over Lexicon? Lexicon is a good brand and all, but for a power amplifier, you're not going to gain anything by paying $3k over paying $1k.

As for a subwoofer amp, how about a Yamaha P7000S? It's still a pro amp but it's EEEngine which is described as having a "Class D power supply" which would be using Class D-like methods to create a tracking power supply to get the efficiency of Class D with what they claim to be better performance. Personally I think either way is fine. I am not running this amp myself but I've read about it and it seems to be a quiet amp as far as fan noise goes. The P7000S is what I would LIKE to have for my sub(s) but I am currently using an O-Audio 500w BASH plate amp on my (currently) single sub...

http://www.yamahaproaudio.com/global...ifications.jsp
post #3 of 16
Thread Starter 
Thanks for the post Donoman,

I did look at the Yamaha P series for the subs as well but I'm not sure about the fan noise when they are under load? They certainly have the power. I'm not crazy about the aesthetics of the new P7000S either but I'll certainly put this amp on the short list for the subs.

For the 7 channel the more I look into it the more it seems there are too many options!

thoughts on these please

Primare 30.7

Sunfire TGA-7401

NAD T975

Sherbourn PA 7-350

Outlaw 7900

ATI 3007

I think the Primare and Sunfire are lighter and less rack spaces so that appeals to me but I don't want to sacrifice power I may need as a result...

Thanks
Calvin
post #4 of 16
Here's a way to get there in 4RU and under $7k total, with a consistent aesthetic.

Mains amp: ElectroVoice CPS-8.5. Has a fan, but it's a lot quieter than the Berry EP2500 or Peavey IPR line. 250x8 into 8Ω, 500x8 into 4Ω, with any channel pair bridgeable to 1000W/4-8Ω.

Sub amp: ElectroVoice CPS-4.10. Basically the same amp as above, except half the channels with the same aggregate output (500x4/8Ω, 1000x4/4Ω, 2000x4/4-8Ω bridged).

Both have 12V triggers, too. With selectable turn-on delays. They're expensive, but I would expect that they have much higher labor costs than many others (EV is a division of Bosch, and these are marked "made in Germany.")

While I've only seen the CPS 4.10, I use the 8.5 to drive my multisub system, and it just works. No fuss, no drama, just sound. It's in the same room as the system, about 14' from the listening position.

Other brands to look at for big power in a small package are Powersoft, Camco, and Ashly. (Or Powersoft OEM'ed amps, such as the Klein+Hummel/Sennheiser rack amps.) Though to my knowledge none of those firms' amps have 12V triggers built in.

The only downside is that you'll have to cut apart your signal wires, because they have Phoenix terminal inputs rather than RCA. And read how to connect the wire, because to get full output you'll have to connect the shield and ground terminals together.

But regardless of what you pick, you should look for an amp with electrical safety approval from an OSHA-approved NRTL.

Sadly, proper safety approval (it's voluntary, not legally mandated) is fairly rare.
post #5 of 16
Thread Starter 
DS-21 thanks for the suggestion. I've never heard of ElectroVoice amps before I'll have to look into them. Have you measured the fan noise or have a guess of what it would be db wise when they are going from 8-10' away?

Thanks again
Calvin
post #6 of 16
Quote:
Originally Posted by calv1n View Post

DS-21 thanks for the suggestion. I've never heard of ElectroVoice amps before I'll have to look into them. Have you measured the fan noise or have a guess of what it would be db wise when they are going from 8-10' away?

Thanks again
Calvin

I'd not heard of 'em two months ago, either. Then I did, and one of them pretty quickly ended up in my home.

No fan noise measurements yet, but I'll get you a measurement of the CPS 8.5's fan on Friday.
post #7 of 16
Thread Starter 
Thanks DS

Anyone else have any suggestions for me to look into?

Thanks
Calvin
post #8 of 16
Well, that Sherbourn amp is a BEAST.

I've owned several Sherbourn amps and they will drive any speaker to any level, cleanly, and quietly.

Great company as well. Just good people with incredible products.
post #9 of 16
Sherbourn PA 7-350 needs a 20amp circuit and is built by Emotiva. Both are owned by Jade Designs. No reviews or independent testing out yet. Audioholics named it a product of the year without testing it. But don't take that as an endorsement imo. Look at the relationships between companies, I think.

ATI 3007 - ATI builds the amps for Outlaw, Lexicon, Cary and a number of other companies. Plain to look at (imo) but according to ATI they save a few tricks for their amps that aren't in the others.
post #10 of 16
Quote:
Originally Posted by htcritic View Post

Well, that Sherbourn amp is a BEAST.

I've owned several Sherbourn amps and they will drive any speaker to any level, cleanly, and quietly.

Great company as well. Just good people with incredible products.

Not the same company you and I knew I think. Now owned by Jade Designs aka Emotiva. Ron Fone still there but Eugene Tang amps no more. Inards look exactly the same as Emo now.
post #11 of 16
Thread Starter 
Thanks gentlemen I appreciate the input. I have the ability to bring in the Sherbourn but I don't think they'll let me demo it (I am exploring the option though to see if they will). It certainly is a beast but I don't want to shell out the 4k with out testing it unless I'm fairly certain it's going to be a winner.

I currently have a Lexicon GX-7 that I'm demoing and I like it but I have a few hesitations. One is the Lexicon runs much hotter then the flying mole I've swapped out (but it has more power). I'm also as is normal wondering if there is something better for less or the same $ which is always the way of things electronic I guess. The lexicon runs 125 watts per channel (which I think they said is capable of actually putting the full 125 to all channels driven rather then a split which is the norm as I understand it). The speakers however are 175 watt peak / max so I'm wondering if I shouldn't match the amp to this peak so I can max them if I ever needed to (the Lex seems plenty loud enough for me and wife with just 2 of us in the theater but when it's 8 or 10 people I'm not so sure).

I have the lexicon till Saturday to decide upon and then I'll take it back and try something else or keep it if I don't think I can do any better.

edit. I should mention I have 3 x 20 amp dedicated plugs in my AVR rack room for amps so the power / amperage won't be an issue in the decision making I'll be fine with any amp I think in that regard.

Thanks again.

Cheers
Calvin
post #12 of 16
I didn't know Sherbourn was purchased!

Things change fast.
post #13 of 16
Quote:
Originally Posted by calv1n View Post

For the 7 channel the more I look into it the more it seems there are too many options!

thoughts on these please

Primare 30.7

Sunfire TGA-7401

NAD T975

Sherbourn PA 7-350

Outlaw 7900

ATI 3007

I think the Primare and Sunfire are lighter and less rack spaces so that appeals to me but I don't want to sacrifice power I may need as a result...

Thanks
Calvin

Since it seems you don't want an amp that runs hot like the Lexicon, the Sunfire seems to be the way to go. They are pretty light and run cool since they are Class H amp. Plus the model you are looking at is 400x7.
post #14 of 16
Thread Starter 
I'll look into the Sunfire a bit closer thanks for the post! Does anyone have any comments on the sunfire as far a noise level or anything else that I should know about when I'm considering this amp?

Thanks again
Calvin
post #15 of 16
Quote:
Originally Posted by DS-21 View Post

No fan noise measurements yet, but I'll get you a measurement of the CPS 8.5's fan on Friday.

Sorry about the delay.

With the free JL Audio/Studio Six app on an iPhone 4S, and the top of the phone right up against the front vents of the amp but not touching it (front mike facing the amp) I measured a 24dB delta between fans at their loudest, and amp off.

Way more than I expected, to be honest, because I've never heard it in its usual spot (under a daybed, maybe 15' from the primary listening position). By contrast, a fan noise from a Peavey IPR 3000 was very obvious in the same space.

That said, to GET the fans moving, I had to let the amp idle for a while. Class D amps actually seem to generate more heat idling than when driving a load. (I'm sure there's a good technical explanation for that, but I don't know it.) And it took the fans a while for start moving when idling. 10-12min. Ambient temp was mid-70's Fahrenheit.
post #16 of 16
My suggestion may be a bit late but I'd say to take a look at crest audio cc series amps for your subs(maybe for your mains as well but I've never tried them in that capacity). They're very affordable and the fan noise is virtually non-existent. I have a cc4000 running a bridged 4ohm load and I never hear the fan. My ps3 is actually MUCH louder than the cc4000. The one downside is that the activity lights are bright enough to be seen from your neighbor's living room. I put some felt pads over them(I didn't want to use electrical tape but you could do that if you want). You can still see the lights a little bit if you're looking at them but they aren't distracting. Best of luck.
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