Amp running hot in home theater mode

[MAAudioGuy]

I'm a newby to this site, so apologies if a similar question like this has been posted. Moderators feel free to redirect it to another thread.

I have a Rega Osiris integrated amp, which drives my two main 2-channel speakers. When I run it with my CD player, the Osiris runs fairly cool. Last night, I was running the Osiris through my home theater system. The Osiris has an input called "Direct Line" for home theater to allow my home theater preamp to send a signal to the two main front speakers. I have a Sony 9000ES preamp that handles the home theater processing, including the volume.

When I went to shut off my Osiris, it was running extremely hot. Almost too hot to touch. I'd never experienced that before with an amp or preamp. This is my first integrated amp.

Does this sound like a defect with the product or maybe some kind of electrical issue with my apartment? I'm living in a rental apartment and don't know much about its electrical capabilities (number of amps service, wiring, etc.) I obviously don't want to damage an expensive integrated amp like this.

If an amp runs hot like this is it that a sign of it not getting sufficient voltage? I'm no electrical expert, so I'd appreciate any insights our more technical readers have.

Let me know if readers need additional details.

 

[ZeGhostbear]

I have a Rega Osiris integrated amp, which drives my two main 2-channel speakers. When I run it with my CD player, the Osiris runs fairly cool. Last night, I was running the Osiris through my home theater system. The Osiris has an input called "Direct Line" for home theater to allow my home theater preamp to send a signal to the two main front speakers. I have a Sony 9000ES preamp that handles the home theater processing, including the volume.

Do you have different speakers in your home theater system? Efficiency varies greatly across models and can present different loads to an amp.

When I went to shut off my Osiris, it was running extremely hot. Almost too hot to touch. I'd never experienced that before with an amp or preamp. This is my first integrated amp.

Could just mean that the heatsinks are doing their job of transferring the heat away from the internals. It appears to be all passive without fans. Do you have enough ventilation around it?

Read p.4 of the manual on ventilation:
http://www.rega.co.uk/downloads/Osiris%20manual.pdf

Does this sound like a defect with the product or maybe some kind of electrical issue with my apartment? I'm living in a rental apartment and don't know much about its electrical capabilities (number of amps service, wiring, etc.) I obviously don't want to damage an expensive integrated amp like this.

If an amp runs hot like this is it that a sign of it not getting sufficient voltage? I'm no electrical expert, so I'd appreciate any insights our more technical readers have.

It has nothing to do with the electrical supply in your building. Also on p.4 of the manual you will find mention of the "thermal cut-out" protection feature. As long as that is not kicking in you are not running at danger level. Of course heat kills electronics and the cooler you can run it the longer it might last. My ONKYO TX-NR905 receiver has had me worried for years as it runs too hot for my comfort, but other owners are reporting the same issue (and the fan never seems to kick in).

Maybe some Osiris owners can chime in?