Two questions about API lunchboxes...

[max cooper]

Just picked up a couple of API 525 comps and I'm wondering if anyone's using them with the stereo link in a lunchbox and if anyone knows a way to make the stereo link switchable.

Also, from the 6B lunchbox description on the API website:

"The 500-6B comes with "nominal level" jumpers located on the connector board. Although it comes factory set at +4, the levels for either the input and/or the output can be changed to -2. This can be accomplished easily by using needle-nose pliers. Instructions are printed on the connector board for the nominal selections. Extra jumpers are also supplied and attached to the connector board just in case a channel jumper gets lost."

It seems that this is a discontinued function that can be made functional at the factory. The pinout diagram lists pin 2 on the pre as:

512c, 550b, 525, 560b OUTPUT + (+4)

and pin three as:

512c, 550b, 525, 560b OUTPUT + (-2)

I'd prefer not to send the box back for this. If anyone's got experience with this, I'd be grateful.

thanks!!!

[David Kulka]

By connecting a switch between pin 11 of the two edge connectors ("side chain in"), you can have a switchable stereo link.

What was the other question?

[max cooper]

oh...I didn't get to the question part of that. I'd like to be able to switch between +4 and -2 if there's an easy way to do so on a lunchbox manufactured after the jumper feature was discontinued.

Many thanks for the info on the link!

[David Kulka]

If you really wanted to, I'm sure you could connect a switch or two to the the links of the PCB, to be able to go back and forth. Wiring it neatly could be a little tricky.

I question whether this is really a good idea. The -2 option is mainly there for situations where the module is permanently installed in a console and will not be patched to the "outside world".

Out of curiousity, what would be the reason for the switch?

[max cooper]

It's not as important to me as the stereo link for the 525's. I figured if it was an easy thing it would be nice to have the option (especially in the absence of a fader).

I ordered a blank panel to install the compressor link switch and figured this would be the time to implement the gain switch...but I'm sold...it's not that important.

Many thanks for the info..I love API gear, but there's scant info on their modules. Web search for "API 525" (for example) only gets you the same text from the "brochure" again and again on different websites.

Someone here's looking for a pinout diagram on a 225 and for some reason it's not on the API website, although the info for the 500 series stuff is.