Thermal shutdown

[Bill R]

Hi everyone,

Thermal shutdown question. I have a Denon AVR-X2700H running a pair of Martin Login 60XTi's. I know it's a little low on power for these speakers but I can't afford a better amp currently. I like to crank it up when I am by myself, I have been around home and car audio my whole life and I am good about knowing where to run the volume, depending upon the type of music. But for some reason this amp just doesn't like more than 5-10 minutes at around 3/4s volume(68 - 71ish) on the volume control. The amp has 3-4" of top clearance and good flow front to back. Is it safe to add cooling like a fan and if so any good ideas? Or is adding cooling likely to cause damage or a waste of time.

Thank you in advance.
Bill

 

[AcuDefTechGuy]

Yeah, add 2 or 3 big 150mm USB fans atop the AVR. Works every time.

Also, I would change the power mode to ECO or Economy mode if the X2700 has it, which will help cool the amps. Or try this first before adding the fans.

 

[ryanosaur]

AC Infinity has solid product, either independent fans designed to be placed on top or a complete smart option like their AirCom T8

Amazon.com

or

Amazon.com

Of course, there are many other options out there, too.

Most important is that you need to always make certain you have room above AND ON THE SIDES of the AVR. Also, the back should be open and not closed. Technically, I think they spec something like 6" of open space on the sides and above.

Those AC Infinity products will vent directionally. If you do not have an open back cabinet, you will need to aim them forward into your room. Or if you like that AirCom unit, get the front vent option.

Because you have so little space, avoid fans that just pull air up and directly into the shelf above. That won't help you out much.

ECO mode may help, but it will also nerf your amp stage a little.

 

[TLS Guy]

Hi everyone,

Thermal shutdown question. I have a Denon AVR-X2700H running a pair of Martin Login 60XTi's. I know it's a little low on power for these speakers but I can't afford a better amp currently. I like to crank it up when I am by myself, I have been around home and car audio my whole life and I am good about knowing where to run the volume, depending upon the type of music. But for some reason this amp just doesn't like more than 5-10 minutes at around 3/4s volume(68 - 71ish) on the volume control. The amp has 3-4" of top clearance and good flow front to back. Is it safe to add cooling like a fan and if so any good ideas? Or is adding cooling likely to cause damage or a waste of time.

Thank you in advance.
Bill

I would certainly add fans. However I would be very careful, those speakers are a nasty load.

This is the NRC measured impedance curve.

Phase angles are negative during most of that dip, being minus 60 at 100 Hz.

The frequency response is not encouraging.

So I would be very careful with the volume control, fans or not. Those speakers are in the receiver buster category, so I'm not surprised the receiver shuts down. You only have a limited number of thermal shutdowns before the receiver is destroyed due to blowing an output transistor. So be careful and moderate your volume.

 

[lovinthehd]

Just turn it down a bit until it doesn't happen any more would be a good approach until you can get burlier amps. But a fan can only help.

 

[Verdinut]

I don't think the fans will be sufficient. The OP needs a 3-channel external amplification. Either a Monolith or a Buckeye 3 channel amp would do the job taking into account that he often likes to play his system at high SPL.

 

[TLS Guy]

I don't think the fans will be sufficient. The OP needs a 3-channel external amplification. Either a Monolith or a Buckeye 3 channel amp would do the job taking into account that he often likes to play his system at high SPL.

The OP says he has no funds for a bigger amp, so he will have to go easy on the volume control fans not withstanding. Those speakers are real receiver busters. But more to the point they are another in a long line of incompetently designed speakers from multiple manufacturers.

The impedance curve is something to be ashamed of. These are big speakers, yet they have a false bass with a 100 Hz peak and then the bass drops out like a falling rock and they are 8 db down by 60 Hz and falling fast.

I don't know how these designers can be happy with that sort of result. But this sort of design malpractice is just common.

I would never pass off a design like that. I have much higher personal standards than that. You would think that with all the design software available now you would never see those sort of results. There is no other way to describe it, other than a disgrace. I bet they have blown more than a few amps and receivers.

 

[AcuDefTechGuy]

Always doom and gloom all the time.

I used to own a Denon AVR-3000's which powered various speakers (Philharmonic 3, Dynaudio, Focal, Infinity, B&W, Revel, KEF, TAD, and others). This was in my family room 20' x 18' x 10' ceiling, open to 3 sides.

It would never shut down with any volume when just listening to music (classical, pop, rock). But every time we sang karaoke, it would shut down after about 15 minutes.

So I added a few USB fans atop the Denon AVR. It NEVER SHUT DOWN again even after hours of karaoke during the family parties.

I don't think the older Denon AVR had the ECO power mode or I would have tried that. But the problem was HEAT.

So just COOL IT DOWN and CHILL OUT.