Martin Logan 60XTi, what to power these with?

T

TheTallOne89

Audioholic Intern
How far do you sit, and the spl you mostly listen to if you don't mind sharing? Thank you.
They are 11-12 feet away. About 85 dbs generally I would say, not sure how high the peaks get, it is mostly movies as well.
 
P

PENG

Audioholic Slumlord
They are 11-12 feet away. About 85 dbs generally I would say, not sure how high the peaks get, it is mostly movies as well.
I forgot to ask for the spl from one speaker, if it was measured during a movie or stereo music, most of the time you would get 3 to 5 dB louder than just one speaker. So yes it looks like the AVR alone can do the job, but I suspect without an ext fan on top the unit would run quite warm.
 
Kvn_Walker

Kvn_Walker

Audioholic General
Following tests which were reported to have been done at the NRC in Ottawa for Sound Stage Network, this ML Motion 60XTi loudspeaker shows an impedance curve that goes down below 3 ohms between 80 and 400 Hz and with lowest values of 2 ohms at 100 Hz and at around 350 Hz. In addition, the phase angle response is really demanding with a -65° at 80 Hz. In my opinion, no AVR can handle that speaker and solid external amplification is required. The driving amplifier is actually seeing a 3 ohm speaker.


Possibly the Outlaw Monoblock would be able to handle that hard to drive speaker, but I'm not so sure. Perhaps @PENG could answer this. However, some pro audio amps such as the two channel QSC DCA 1222 definitely would, as it is specifically designed to drive in cinemas, with each channel, four 8 ohm speakers in parallel. It isn't cheap but it is reliable and you can't kill it. I'm actually using three of them in my HT:

I mentioned in another part of the forum the Niles 275 which I purchased used for 100+ shipping to drive my PSB Goldi's which were kicking my AVR's ass. They also made a more powerful version of that amp (2125 or 2150 or something). Those are designed to be stable down to 2.7 ohms (three pairs of 8 ohm speakers wired in parallel).

Crown XLS are also stable down to 2 ohms and built for rugged use. So a few inexpensive options are out there.
 
Mikado463

Mikado463

Audioholic Samurai
Just got a great deal on these locally! Paid $1800 for a pair in mint condition!
late to the party here and safe to say you've gotten a lot of good advice, just wanted to say congrats on the Logans. Excellent price on a very good speaker ! I've listened to them on several occasions and yes they do like plenty of 'stable' power. Keep us posted as to how you make out on the journey ahead.....
 
T

TheTallOne89

Audioholic Intern
I forgot to ask for the spl from one speaker, if it was measured during a movie or stereo music, most of the time you would get 3 to 5 dB louder than just one speaker. So yes it looks like the AVR alone can do the job, but I suspect without an ext fan on top the unit would run quite warm.
Yeah that is with the whole system running, watching movies; I have not tested just a single speaker. While watching 4k discs, I usually have the volume around -8. I should test what my usual stereo/music spl is, have not done that yet (I generally listen to music less loud than I watch movies).

The top of the Denon does get warm, although not scalding. I don't have a fan but it is just sitting on a media stand in open space with nothing on top of it, so as good of ventilation as you will get without a fan.

Out of curiosity, is there some warning sign I should be looking for other than the system going into protection mode? I have not, as I said, had any issues with the volume or anything, but I don't want to be potentially damaging something without knowing it.
 
Verdinut

Verdinut

Audioholic Ninja
Yeah that is with the whole system running, watching movies; I have not tested just a single speaker. While watching 4k discs, I usually have the volume around -8. I should test what my usual stereo/music spl is, have not done that yet (I generally listen to music less loud than I watch movies).

The top of the Denon does get warm, although not scalding. I don't have a fan but it is just sitting on a media stand in open space with nothing on top of it, so as good of ventilation as you will get without a fan.

Out of curiosity, is there some warning sign I should be looking for other than the system going into protection mode? I have not, as I said, had any issues with the volume or anything, but I don't want to be potentially damaging something without knowing it.
I would suggest that you get a pair of AC Infinity fans to put on top of your Denon. That should help prolonging its life.

 
Trell

Trell

Audioholic Field Marshall
Yeah that is with the whole system running, watching movies; I have not tested just a single speaker. While watching 4k discs, I usually have the volume around -8. I should test what my usual stereo/music spl is, have not done that yet (I generally listen to music less loud than I watch movies).

The top of the Denon does get warm, although not scalding. I don't have a fan but it is just sitting on a media stand in open space with nothing on top of it, so as good of ventilation as you will get without a fan.

Out of curiosity, is there some warning sign I should be looking for other than the system going into protection mode? I have not, as I said, had any issues with the volume or anything, but I don't want to be potentially damaging something without knowing it.
Depending on the ambient temperature (around 20 C/68 F )that is supposed to work well, but heat is an electronics destroyer in the long term, so some kind of external cooling will generally be beneficial.
 

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