Denon PMA-720AE - Tone controls dead on left channel?

[hybridauth_Facebook_100000077875321]

I have a nice budget hi-fi setup includeing the Denon PMA-720AE amplifier paired with a set of Monitor Audio BX2 speakers; however today I noticed the tone controls no longer work for the left channel.

I tested the left speaker wired to the right channel; and sure enough the tone controls (loudness, bass, treble) are dead on the left channel but are fine on the right. The amp is only 10 months old.

Now I don't want to get into the debate that I should not be using tone controls; but I usualy have the trebble at max and the loudness on to make the sound colourfull and vibrent to my liking. What would have coursed this malfunction/breakdown? I also dont have the volume knob past 10 o"clock.

I hope I have not damaged it by pusing it to much?

What shall I do, just replace it as it is still in garantee?

Any help apprteciated; Elliott.

 

[hybridauth_Facebook_100000077875321]

Problem seems to gone away and all is OK after leaving the amp off for about 10 minutes.

Tempremental problem and will it come back?

 

[hybridauth_Facebook_100000077875321]

Problem has come back!, Why has this happended?

 

[MeanandGreen]

If it's 10 months old you really need to get it back to the retailer as it's still under warranty. It's too new to be messing about with, just take it back.