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Denon AVR vs. Martin Logan Electrostats

My main speakers are Martin Logan "Source" (ESL electrostatic panels) added to a system powered by Denon AVR-X3000. Previous main speakers were Martin Logan SLM-XL (part of the Motion series), and volume was fine. Now with the ESL's, the AVR can't deliver enough volume, and because of the low impedance of these speakers, fear the AVR is struggling with the load. Martin Logan website recommends using 'quality' amplification, which they define as, "...nearly doubles power from 8ohm to 4ohm load, and doubles again to 2ohm load...". Denon says their "X" receivers nearly double power between 8ohm and 4ohm, but no mention of 2ohm (so I suspect 4ohm is their limit).

My question is, will an upgraded Denon AVR with more power (AVR-X4500H, or 6500H) supply the needed power to get the most of these Martin Logan's, or is a pre/pro required.

I am a fan of the Denon feature set (for HT), and have thoroughly enjoyed the X3000 for many years, so wouldn't mind upgrading if that will fix the problem. But anything above that (cost-wise) or loss of features is not the direction I want to go.

If Denon doesn't offer an AVR that will push these ESL's, then I'd rather replace the ESL's with something else. DefTech is out (can't tolerate the shrill sound of those aluminum tweeters), and I know from the Martin Logan SLM-XL's that I really like AMT tweeters, and am perfectly ok with any good soft dome. Most likely speaker substitute would be either Golden Ear (which I have auditioned - they are awesome and awesomely expensive) or Emotiva (which I have not heard) - both have good reviews. I have also heard Martin Logan Motion 60XT, but was underwhelmed (too bright and with cabinet resonance when pushed). 

Any thoughts would be appreciated. Hoping others with ML ESL experience could tell me straight if Denon AVR-X**** just won't deliver, and I need to go speaker shopping. Will be tough giving those up, if that's the case - these electrostatic speakers are truly amazing (even when underpowered).
128x128mwatsme
mwatsme's avatar
mwatsme OP
187 posts
 
Thank you for the replies, and some great ideas. The point of running setup again should have been obvious, and probably would have if I'd had a monitor connected to see the Denon on-screen menu. As it was, we moved into a new house nearly a year ago, and before the HT was unpacked, basement flooded, inspiring many months of work on my part. During that time, purchased the Source speakers and they sat in storage (after a quick connection to be sure they worked). Now the Denon is out of moth balls, but still no monitor connected. Rerunning Audyssey should be the next step, if previous settings are still in effect, the mains are probably set to "small speaker". Also, I was reading in the manual of AVR-X6500H, that impedance is selectable in the menu too, and this is probably true for my X3000 as well.

Also appreciated the idea of using pre-outs to another more capable amp for the Source speakers. This would be a great option, especially if Source's might be upgraded later to larger electrostats. I am fond of their qualities.

Taking it to the next level with Denon's sister Marantz is another good idea. Although, not sure I'm that much of a hobbyist. It opens up another level of upgrade potentials that seem endless. I was looking at Emotiva amps (really like the modular construction), and thinking that might work, then noticed the price of the matching preamp, and thought oops - this game is for enthusiasts with a different budget for such endeavors.
caphill
674 posts
 
I wouldn’t get the Emotiva amp. Get the Rotel RMB-1585 amp it’s way better than the Emotiva the Rotel RMB-1585 costs more than the Emotiva but it’s way more refined sounding and more capable and competent amplifier than the Emotiva. No comparison.

So a combination of the Marantz AV8802 preamp surround processor and the Rotel RMB-1585 five-channel power amp will make those ML Source sing and do those speakers justice. 
That Rotel RMB-1585 will drive them effortlessly as the ML Source can dip into below 2 ohms. 
mwatsme's avatar
mwatsme OP
187 posts
 
Is there a 2-channel version of the Rotel RMB-1585, or another equal performing recommendation for 2 channel? None of the other speakers in the system are as demanding and could run on AVR power.

Unless the Source's are replaced with another set of larger ML panels, and repurposed for surround use... and so begins the never-ending spiral of upgrades.

Seriously though, is there a 2-channel amp recommendation? To be used with Denon X6***-series AVR pre-outs.
caphill
674 posts
 
Yes there’s a stereo version of the Rotel RMB-1585 called the RB-1582 MK ll currently retails for $1600 new. Basically the same amplifier as the RMB-1585 except it’s two-channel. This amp will pair really well with your ML Source.

Both the RMB-1585 & RB-1582 MK ll have unlimited power reserve and able to drive just about any demanding power hungry speakers out there and they sound excellent for the money. You can never go wrong with Rotel when it comes to amplifiers. They make great gears for the money. When Kal Rubinson of Stereophile reviewed the Rotel RMB-1585 he used the amp to drive his big B&W 800 D2. These B&W 800 D2 are power hungry and require high current clean quality amplification and the Rotel RMB-1585 had no problem driving his B&W 800 D2 and drove them effortlessly.

Rotel also makes its flagship stereo power amp called the RB-1590 retails for $3k new. This is a dual monoural design. This is a monster amp weighing for around 91 pounds. The RMB-1585 five-channel amp is also a monster huge weighs in around 80 pounds. Has 2 oversized main toroidal transformer power supplies, one for the front LR channels and the other is for the center and surround channels. They are great amps for the money and will outperform or sound better than those amps in similar price ranges or even higher.
batman1971
96 posts
 
Ive had magnepans , when used in home theater, the room correction in the dennon doesnt exactly do well with planar speakers, i think manually configuring the setup will help tremendously.

the rotel amps are ive had one since the 80s and it still works, but  woiuld check out odyssey amps, they run maggies very well and can adjust the bias easily for the maggies.   Not sure you can hope a phone call wiht the owner of rotel and have him walk you thru how to bias their amplifiers. . its amazing what playing with the bias will do for electrostatics. 


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