Bas X A700 - static sound in speakers when starting

[newfieninja]

Hi All,
I've recently added a BASX  A700 to my system to run my surround speakers.  I have it triggered from my Marantz SR7800 receiver which since adding the 700 is now running as a prepro with none of its internal amps being used.  I now get a loud static sound through my speakers when I first power the system up, it basically happens as soon as the amp powers on and then everything is fine.  I am worried that this may cause damage to my speakers.

  To give a little background on my system, I am running Paradigm Monitor series 7 speakers with Monitor 11 fronts, Monitor 3 center channel and assorted series 7 speakers for surrounds in a 9.2 configuration.  I already had an XPA 3 gen 2 amp running the fronts and center  and also have it triggered from the receiver. I never noticed this sound on startup before adding the BASX.  I am using the same cables for both amps so don't think that is the cause.  Is anyone familiar with this issue with any of their setups? 

On a positive note, as soon as the BASX was added I noticed that my surround speakers sounded more full, it was a substantial difference over the sound from the receivers amps which I always thought sounded good on their own.  I am extremely happy with the performance of the amp and it's build quality is on par with the XPA gen 2. If I can get the startup issue solved I will be happy with my system.  At least for now anyway

Cheers

[gus4emo]

Oct 6, 2016 19:48:03 GMT -5 newfieninja said:

Hi All,
I've recently added a BASX  A700 to my system to run my surround speakers.  I have it triggered from my Marantz SR7800 receiver which since adding the 700 is now running as a prepro with none of its internal amps being used.  I now get a loud static sound through my speakers when I first power the system up, it basically happens as soon as the amp powers on and then everything is fine.  I am worried that this may cause damage to my speakers.

  To give a little background on my system, I am running Paradigm Monitor series 7 speakers with Monitor 11 fronts, Monitor 3 center channel and assorted series 7 speakers for surrounds in a 9.2 configuration.  I already had an XPA 3 gen 2 amp running the fronts and center  and also have it triggered from the receiver. I never noticed this sound on startup before adding the BASX.  I am using the same cables for both amps so don't think that is the cause.  Is anyone familiar with this issue with any of their setups? 

On a positive note, as soon as the BASX was added I noticed that my surround speakers sounded more full, it was a substantial difference over the sound from the receivers amps which I always thought sounded good on their own.  I am extremely happy with the performance of the amp and it's build quality is on par with the XPA gen 2. If I can get the startup issue solved I will be happy with my system.  At least for now anyway

Cheers

Try bypassing the triggers, turn on receiver first then amps....

[newfieninja]

Thanks, I'll try that this evening after work and will update.

[newfieninja]

I tried using a different trigger cable I had on hand but had the same effect. I also tried triggering the a700 from the xpa 3 but it caused some type of feedback and caused my receiver to power off so I don't want to try that again. When I power on the a700 using the power button after the receiver and xpa 3 is powered on there is absolutely no static at all. Is it possible there is something wrong with the trigger circuit on my A700.

Thanks for the help

[leonski]

Is there ANY way to install a time delay relay? Continue to use the 12v trigger. When the trigger input to the amp is energized, it really starts a time delay relay of maybe 3 to 5 seconds.
Everything ELSE is powered on, the amp than starts normally.
This is a fairly EASY thing to do. Automotive stores might have such a relay and for sure an electronics supply house could fix you right up.

[newfieninja]

Thanks. I'll check it out at my local electronics store early next week to see what hey have to say about it. I'm not really experienced with this sort of thing but they should be able to give me the yay or nay. I'll post an update after I speak to them.

[leonski]

The things to look for are how much CURRENT the coil of the relay needs.
Also, their is something called a 'solid state relay' which may be a module which would work.
Talk to your people and see if you can source what you need thru DIGIKEY. They have a large selection and I don't have time to winnow thru them all.

[newfieninja]

Thanks for the help. I checked with my local company today. They weren't really familiar with 12v triggers on audio equipment. They did have one type of delay/timer there but it didn't seem like it would work and was a little more than I was willing to pay. I am from a small town and there aren't a lot of options when it comes to electronics etc. I am not familiar with electrical at all. The amp works perfectly when it is powered on using the power button so I guess I'll stay with that option for now. It's only a minor inconvenience really.

Thanks again

[leonski]

I'll research 12v turnon and get back to you. I'd suspect a RELAY in whatever was controlled. But, is the 12v constantly applied or does it 'pulse' on/off?
If it is as simple as I hope, i'll go to the next level, look at a suitable part, and make a drawing.

[newfieninja]

That is incredible, again thanks for the help