Audiolab 8000a Speaker Protection

alfajerry · 15th May 2006, 08:47 AM

Does anyone know if a total electronics novice could adjust/disable the 8000a's speaker protection system?
Years ago Audiolab told me it could be adjusted at the factory so it is possible.
Thanks for any help.

pinkmouse · 15th May 2006, 08:52 AM

What are you trying to achieve?

richie00boy · 15th May 2006, 09:18 AM

The VI limiting circuit is disable-able, but I have to ask why you want to do it. If you feel it's encroaching on your listening it's probably time to buy a more powerful amp. The protection is there for a reason.

sreten · 15th May 2006, 09:25 AM

Hi,

Yes a relative novice can adjust the trip limits in an Audiolab 8000A.

The procedure is outlined in the service manual but it is fiddly, I can't
remember the exact details, I think a set of resistor values is needed.

The trip limits should only be adjusted because the load is low impedance.

/sreten.

mikeks · 15th May 2006, 11:17 AM

Quote:

Originally posted by sreten
Hi,

Yes a relative novice can adjust the trip limits in an Audiolab 8000A.

The procedure is outlined in the service manual but it is fiddly, I can't
remember the exact details, I think a set of resistor values is needed.

The trip limits should only be adjusted because the load is low impedance.

/sreten.

Hi Sreten...you wouldn't happen to have a copy of that service manual, would you?

sreten · 15th May 2006, 12:21 PM

Hi,

I do, somewhere at home, I'll have a look for it tonight.

/sreten.

anatech · 15th May 2006, 01:15 PM

Hi Sreten,

Quote:

you wouldn't happen to have a copy of that service manual, would you?

I'd be interested also if it's not too much trouble. I've repaired a few with a schematic only.

I'm still uneasy about messing with the protection circuit. You never want to disable it completely. That is asking for trouble.

-Chris

alfajerry · 16th May 2006, 02:58 PM

I't s because it doesn't go as loud as it should before it cuts the power.
When I spoke to Audiolab several years ago and described the other equipment and the listening environment, they said straight away that it must be set too low, but I couldn't afford to have them change it.
If anyone has a guide to doing this I'd appreciate a copy.
Thanks.

sreten · 16th May 2006, 03:25 PM

Hi,

please tell me the serial number of the 8000A.
For the correct models the procedure is straightforward,
I was confusing it with resetting the bias.

The procedure prevents the mute relay operating on
high level bass transients into low impedance loads.

/sreten.

alfajerry · 16th May 2006, 04:16 PM

Thanks for your interest 'Sreten'

S/N: 207B76250

Jerry

15th May 2006, 08:47 AM	#1
alfajerry diyAudio Member Join Date: May 2006	Audiolab 8000a Speaker Protection Does anyone know if a total electronics novice could adjust/disable the 8000a's speaker protection system? Years ago Audiolab told me it could be adjusted at the factory so it is possible. Thanks for any help.

15th May 2006, 08:52 AM	#2
pinkmouse diyAudio Moderator Join Date: Apr 2002 Location: Chatham, England	What are you trying to achieve? __________________ Al I conceive of nothing, in religion, science or philosophy, that is more than the proper thing to wear, for a while. Charles Fort

15th May 2006, 09:18 AM	#3
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	The VI limiting circuit is disable-able, but I have to ask why you want to do it. If you feel it's encroaching on your listening it's probably time to buy a more powerful amp. The protection is there for a reason. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

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15th May 2006, 09:25 AM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Yes a relative novice can adjust the trip limits in an Audiolab 8000A. The procedure is outlined in the service manual but it is fiddly, I can't remember the exact details, I think a set of resistor values is needed. The trip limits should only be adjusted because the load is low impedance. /sreten.

15th May 2006, 12:21 PM	#6
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, I do, somewhere at home, I'll have a look for it tonight. /sreten.

16th May 2006, 02:58 PM	#8
alfajerry diyAudio Member Join Date: May 2006	I't s because it doesn't go as loud as it should before it cuts the power. When I spoke to Audiolab several years ago and described the other equipment and the listening environment, they said straight away that it must be set too low, but I couldn't afford to have them change it. If anyone has a guide to doing this I'd appreciate a copy. Thanks.

16th May 2006, 03:25 PM	#9
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, please tell me the serial number of the 8000A. For the correct models the procedure is straightforward, I was confusing it with resetting the bias. The procedure prevents the mute relay operating on high level bass transients into low impedance loads. /sreten.

16th May 2006, 04:16 PM	#10
alfajerry diyAudio Member Join Date: May 2006	Thanks for your interest 'Sreten' S/N: 207B76250 Jerry

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