Any risk using a 3 ch power amp as stereo (long term) ? - Page 1
Forum section: electronics / general

author: onesixright
author_rank: Frequent Contributor
timestamp: March 24, 2018, 04:47:50 pm
content: Hi,I don't think so, but double checking can't hurt i guessIs there any risk damaging a 3 ch power amp for stereo use if the third ch input and output are disconnected?Thanks!

author: NiHaoMike
author_rank: Super Contributor
timestamp: March 24, 2018, 05:32:20 pm
content: Should be just fine.

author: Zero999
author_rank: Super Contributor
timestamp: March 24, 2018, 06:25:18 pm
content: Why would you think not?If the output has nothing connected to it, then no current will flow and the output stage will not do anything, other than pass the usual quiescent current.It will be fine, just leaving both the input and output of the third, unused channel, disconnected i.e. open circuit.

author: onesixright
author_rank: Frequent Contributor
timestamp: March 24, 2018, 08:25:24 pm
content: Quote from: Hero999 on March 24, 2018, 06:25:18 pmCouldn't think of something that would causing a issue, yet I'm no export. So just wanted to double check.Thanks!

author: ebastler
author_rank: Super Contributor
timestamp: March 24, 2018, 09:27:31 pm
content: Quote from: Hero999 on March 24, 2018, 06:25:18 pmI assume we are talking about a transistor amp, not tubes and outut transformer, right? In that case, yes, it should be fine. I would probably bridge the unused input to avoid coupling any spurious noise, but I guess that's optional.A stereo amplifier with a built-in backup channel always at the ready if something fails -- great!Reminds me of this:http://throx.com/home.html

author: onesixright
author_rank: Frequent Contributor
timestamp: March 24, 2018, 09:36:41 pm
content: Quote from: ebastler on March 24, 2018, 09:27:31 pmYeah (transistors) its a DENON POA-T3 (built like a tank), nice power amp. Used in my old surround config, but since I changed the stuff I wanted to use it in a other room for stereo. So the "center" channel, will be unused.https://www.avforums.com/threads/denon-poa-t2-poa-t3-power-amps.1955696/Sorry, bridge

author: Edison
author_rank: Frequent Contributor
timestamp: March 24, 2018, 09:56:32 pm
content: Nothing will happen

author: ebastler
author_rank: Super Contributor
timestamp: March 24, 2018, 10:27:29 pm
content: Quote from: onesixright on March 24, 2018, 09:36:41 pmI simply meant to short-circuit the unused input, so it cannot pick up any noise. Amplifying input noise or hum will not damage the unused amplifier; it just "feels wrong". Probably just obsessive-compulsive disorder on my part.

author: Edison
author_rank: Frequent Contributor
timestamp: March 25, 2018, 12:19:45 am
content: they are three monoblocks, for your obsessive compulsive disorder - disconnect the unused degree source - each stage has its own

author: Brumby
author_rank: Unknown
timestamp: March 25, 2018, 02:29:32 am
content: Short the input of the unused amp. Leave the output open (not connected).

author: ebastler
author_rank: Super Contributor
timestamp: March 25, 2018, 07:15:02 am
content: Quote from: Brumby on March 25, 2018, 02:29:32 amDidn't I say that, like, twice?Quote from: Edison on March 25, 2018, 12:19:45 amNow it's my turn to add the question marks -- "degree source" ??

author: Edison
author_rank: Frequent Contributor
timestamp: March 25, 2018, 09:49:32 am
content: Quote from: ebastler on March 25, 2018, 07:15:02 amthe amplifier consists of three monoblockseach monoblock has its own power supplyDisconnect the power supply unconnected monoblockno power = no noise, no consumption

author: ebastler
author_rank: Super Contributor
timestamp: March 25, 2018, 10:11:12 am
content: Quote from: Edison on March 25, 2018, 09:49:32 amThanks; that's what I had guessed.I was just wondering about the "degree" part -- maybe a translation issue?

author: Edison
author_rank: Frequent Contributor
timestamp: March 25, 2018, 10:29:00 am
content: My English is not good, Google Translator is helping me and it looks like it sometimes ..........

author: Watth
author_rank: Frequent Contributor
timestamp: March 26, 2018, 05:29:12 pm
content: With the homeopathy-related debates over here, I read it as a 3CH amp. Like the sound is diluted to a millionth.Holly smoke ! I found a new product for audiophiles and homeopaths ! Homeopathic audio amplification (tm).