Will my SR7007 run my B&W CMs? - AVS Forum
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post #1 of 6 Old 10-20-2012, 03:14 AM - Thread Starter
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Hello all.
I just purchased some new HT gear and was wondering how well my AVR is going to deal with the speakers I chose. I have a Marantz SR7007 running B&W CM9s in the front, a B&W CMC2 in the center, and temporarily Klipsch Synergy SF2s in the rear (these will be replaced with CM8s or CM5s in the future). I keep reading about how the CMs are power hungry and are hard to push at higher volumes due to the low impedance. Do I need to be looking at an external amp? If so, would most agree that an Emotiva XPA-5 fits the bill? This setup will be 50/50 movie/tv watching vs music listening. Thanks for any info that can be provided.

SS

Elite PRO70X5FD, Fat PS3 for BluRay/DVD/CD, Marantz AV7701, McIntosh MC8207, Paradigm Studio 100 v.5s, Paradigm cc590 v.5 center, Klipsch SF2 rears(temporary)
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post #2 of 6 Old 10-20-2012, 04:24 AM
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You may want to review the CM9 threads in the Speakers forum to include the one below ...

http://www.avsforum.com/t/1382584/av-amp-suggestions-from-b-w-cm9-speakers/0_100

Unless you're in a very large room or running them all out, the AVR alone will likely suffice; however, should you decide on additional amperage, the XPA-2 or XPA-3 should be more than sufficient.

Also note there is a dedicated thread for SR7007 Owners .....

http://www.avsforum.com/t/1420942/marantz-sr7007-av-receiver-owners-thread/0_100

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post #3 of 6 Old 10-20-2012, 06:56 AM
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I was using Paradigm Studio 100s with my 7007. Since these speakers are basically 4 ohms I too was concerned.

I talked to several Marantz techs regarding this issue. They all assured me the 7007 could handle the 4 ohms just fine... but. They also recommended I make certain the AVR is adequately ventilated. Free standing in an open environment is fine. Placed in a cabinet generally requires some type of fan or forced cooling. This is because the higher speaker load represented by the low impedance translates to increase heat being generated, specifically during aggressive listening. Hence the specific owners guidelines for AVR clearances in cabinetry.

I did notice my 7007 did get quite warm... no that's not right, hot is more appropriate. I did add a 220 vac muffin fan running on 120 vac which provides a slow speed (very quiet) flow of air in my cabinet. It did make a notable difference although I did not take actual measurements.
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post #4 of 6 Old 11-22-2012, 07:48 PM
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For those who want to know, this is the best deal on the Marantz SR7007 I've seen so far:

$1,295 (it's usually $1800). I thought I got a good deal for $1440, but this beats it.

http://www.*****************.com/product/MARA10/Marantz-SR7007----FREE-SHIPPING.html?gclid=CPzO2uWO5LMCFal7QgodMFkAyA
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post #5 of 6 Old 11-22-2012, 10:30 PM
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Quote:
Originally Posted by Testpattern View Post

I was using Paradigm Studio 100s with my 7007. Since these speakers are basically 4 ohms I too was concerned.

The Studio 100s are not basically 4 ohms or they would have been rated as 4 ohms. I think many people exaggerate how hard their speakers are to drive. Sure it doesn't hurt, but it is by no means required and you will likely not notice a difference.

I have a pair of Paradigm S6s that play to ear blistering levels without clipping on every amp I own. None are rated higher than 140W. They sound their best (from what I've tried) on a Marnatz PM8004 rated at just 70W.

From B&W website:
Sensitivity: 89dB spl (2.83V, 1m)
Nominal impedance : 8Ω (minimum 3Ω)
Recommended amplifier power: 30W - 200W into 8Ω on unclipped programme.

The Marantz output should be well within the recommended power range, and they will only appear as a 3Ω very briefly. This should not be enough to cause any overheating of the SR7007 if properly ventilated.
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post #6 of 6 Old 11-28-2012, 08:42 PM - Thread Starter
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I decided to go with Paradigms myself, as the B&Ws just didn't sound as good in my home as they did in the listening room. I ended up with a pair of Studio 100 v.5s and a CC-590 v.5 center. I also ordered a Marantz AV7701 as well as a Marantz MM7055 amp. The folks at the Magnolia AV store are letting me keep the SR7007 while I wait for the amp to come in. Sorry, I should have edited the thread when I made the change.

Edit: Ended up with an McIntosh MC8207 instead of the Marantz MM7055... The Wife ain't very happy.

Elite PRO70X5FD, Fat PS3 for BluRay/DVD/CD, Marantz AV7701, McIntosh MC8207, Paradigm Studio 100 v.5s, Paradigm cc590 v.5 center, Klipsch SF2 rears(temporary)
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