Need help with my AVR

polk500

Sorry that should be AVR can't seem to edit the subject line

The system consist of a B&k 5000 series 2 amp which I leave on most of the time as well the avr is a HK 3600. Accept when I'm out of town for a few days then I turn the whole system off.

So when I turn on the AVR after turning on the amp probably a half hour earlier I get a loud pop maybe not loud but certainly ( this happens every time ) noticeable to the point it made a friend jump the other day.

Is this a common thing and if so will it hurt the speakers RTI a series.

Thanks in advance Roger

Syndil

Turn on the AVR first. Better yet, use the B&K's control input to power the amp on/off in conjunction with the AVR.

polk500

Hmm I could do that. But I was woundering why it does it in the first place and will it damage the speakers? As I'm not the only one who uses it and the kids don't give a rats **** about what they turn on first.

I guess I could re-program the re-mote to leave the Amp & Avr on all the time. Its a logitech one great re-mote but doesn't always work perfectly and when it don't the kids turn things on manuely.

Oh thanks Ken for editing for me.

Cheers Roger

Syndil

Amp thump is very common with solid-state preamps (or in your case an AVR being used as a preamp). It has to do with the way the power supply ramps up the voltage when the gear is first turned on. This is why it is recommended to always turn on the preamp first, then the amp. Some people recommend doing the reverse for powering off as well (turn off amp then preamp) but IMO that's not as critical as when powering on.

The thump can damage the speakers if it is loud enough. I wouldn't recommend leaving the amp and the AVR on all the time, especially since you have a trigger input you could utilize to control the powering on/off of the amp via the AVR. That's pretty much what that trigger input is for--to provide a method to avoid amp thump. Leaving them on all the time will shorten their lifespan.

polk500

OK thanks for the replies, I will have to figure out how to use the trigger.

Cheers Roger

Syndil

http://www.bkcomp.com/fileadmin/content/content_products/manuals/Past/Amp/AV5000SERIESII.pdf

See pages 8 and 9. The trigger is activated when it senses 5V-24V DC input. What you may need to do is utilize the AC output on the back of your HK 3600 along with a plug-in DC transformer. Plug the DC transformer into the HK's AC output, then modify the end of the cable so that it will plug into the RCA trigger input on the amp.

[Deleted User]

No problem, glad to be of help.

Syndil

Alternatively you could use a multimeter to see if any of the unused outputs on the back of the HK 3600 provide a constant 5-24V DC output. It's got a few different types of IR outputs on there, so one might work. But I believe those usually pulse voltage when sending IR signals, so maybe not. Shame there isn't a dedicated 12VDC trigger output on it, like you would normally see on a preamp.

12V DC transformers with RCA plugs already on them do exist, but good luck finding one. Might be easier to find one with a 3.5mm (1/8") mono plug on it, and then use a 1/8" to RCA adapter.

B Run

I ran an Adcom amp for a while off 4 different avr's, and the ONLY one that has ever done that was the HK3600. I ended up returning it and never had the problem again.

leftwinger57

firstly ,Iam lucky enough to not have any thump while turning on either my Adcom555 or Onkyo P-301 pre in any order. I do remember a friend of mine had a Mac 2105 w/ some ESS HEILamt speakers and there was a considerable thump upon power up. He always lowered the volume then set his levels. I also knew a guy in a band situation that blew his speakers from the dreaded turn on thump.

BlueFox

I do not have the issue powering up either the two-channel or the HT, which uses an AVR as pre/pro with an external amp. However, if I turn my Bluray off first then I get a good thump. So, the AVR goes off first.