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View Full Version : JBL 4333A selector switch for mono / bi-amping



spirou38
06-06-2011, 11:32 AM
Hi folks,

Is the 4333a selector switch for mono / bi-amping still available from JBL :confused:?
Or can I buy a compatible part elsewhere :crying: ?

Thanks for your help:applaud:,

Pascal

BMWCCA
06-06-2011, 05:39 PM
Is the 4333a selector switch for mono / bi-amping still available from JBL :confused:?
Or can I buy a compatible part elsewhere :crying: ?I believe not too long ago someone here was sourcing a modern replacement for the 4-ways. Shouldn't be any different for a 3-way. :dont-know: Member "4313B" perhaps?

But remember, the switch is often to blame for problems and the suggestion is usually just to bi-amp them and bypass the switch altogether. From the "Designer's Post" under 4345 in the Forum's System Information heading; Greg Timbers wrote:
There was the added complexity that the Marketing folks of that time required switchable bi-amp capabilities in which the incorrect setting of the switch was not allowed to hurt anything. These little things all add up to additional insertion loss for the woofer and loss of damping control.

spirou38
06-07-2011, 02:26 AM
Hi BMWCCA,


I believe not too long ago someone here was sourcing a modern replacement for the 4-ways. Shouldn't be any different for a 3-way. :dont-know: Member "4313B" perhaps?

Are you thinking of that post http://www.audioheritage.org/vbulletin/showthread.php?166-4333-S300-L300-equivalent-bandbass-circuit&highlight=modern+replacement+4-ways where Giskard proposed schematics of new filters for 4333A without the rotary selector ... but I will need 2 filters : 1 for mono and one for bi-amping :crying:


But remember, the switch is often to blame for problems and the suggestion is usually just to bi-amp them and bypass the switch altogether. From the "Designer's Post" under 4345 in the Forum's System Information heading; Greg Timbers wrote ...

Yes, I know :(, but I would like to keep my 4333A as close to the original as possible.
It's why I am looking for rotative selectors and that is not obvious :banghead:

Pascal

BMWCCA
06-07-2011, 07:04 PM
Are you thinking of that post http://www.audioheritage.org/vbulletin/showthread.php?166-4333-S300-L300-equivalent-bandbass-circuit&highlight=modern+replacement+4-ways where Giskard proposed schematics of new filters for 4333A without the rotary selector ... but I will need 2 filters : 1 for mono and one for bi-amping :crying:

No. Whoever it was was receiving such a switching device from Russia (?) maybe and was disappointed in the first prototype or version awaiting a second or had received one that was claimed to be superior to the OE version. At least that's what my near-60-year-old mind remembers. :dont-know: I'm no expert in this stuff so I might be thinking of a three-way switch or something else.

We are talking about this type of switch, right?: http://www.audioheritage.org/vbulletin/showthread.php?5209-4430-help!&p=47729&viewfull=1#post47729 (http://www.audioheritage.org/vbulletin/showthread.php?5209-4430-help%21&p=47729&viewfull=1#post47729)

Though Tom is no longer with us, this thread mentions a replacement:
http://www.audioheritage.org/vbulletin/showthread.php?521-Bi-Amp-Question

Then there's this contribution from another departed member, if it's applicable:
http://www.audioheritage.org/vbulletin/showthread.php?5209-4430-help!&p=47729&viewfull=1#post47729 (http://www.audioheritage.org/vbulletin/showthread.php?5209-4430-help%21&p=47729&viewfull=1#post47729)

51612

Good luck. Just trying to help.