Need Help SDA 2A

westmassguy

I scored a pair of SDA 2As for practically nothing. Problem #1 is they're completely disassembled. The original owner had planned to refinish the cabs, but never got around to it. So I've got several boxes of components, cabs and grills.
I've gone through all the parts, and everything is there, except the interconnect cable and the blade connectors that mount to the cabs.
Finding a two conductor panel mount connector and matching plugs/cable isn't a problem, but the schematic for the 2A posted on here is a bit confusing. The right channel is supposed to have a connector with blue and white wires, and the left channel black and white wires. These wires then connect to the spade terminals on the dimensional modules.
This is where I'm confused, between pins A & B, and which spade terminal gets which wire.
The notation on the schematic, where it says "Backwards" is even more confusing.
Any help would be appreciated.

Schurkey

The schematic for the 2A SDA jack is labeled "B" above "A". Then there is a notation that this is backwards. The upper connector should be "A" (which traces back to the + binding post) and the lower should be "B" which will connect to the 130uF + 130uF capacitors. For confirmation, see the schematic for the SDA 1B.

Beyond that, the chart at the bottom of the schematic shows which wire connects to which position in the SDA jack. It varies between the left and right speaker cabinet.

Right cabinet:
Blue wire = wide blade = eventually connected to + binding post.
White wire = short blade = eventually connects to capacitors

Left cabinet:
Black wire = short blade = eventually connects to + binding post.
White wire = wide blade = eventually connects to capacitors.

westmassguy

Schurkey wrote: »

The schematic for the 2A SDA jack is labeled "B" above "A". Then there is a notation that this is backwards. The upper connector should be "A" (which traces back to the + binding post) and the lower should be "B" which will connect to the 130uF + 130uF capacitors. For confirmation, see the schematic for the SDA 1B.

Beyond that, the chart at the bottom of the schematic shows which wire connects to which position in the SDA jack. It varies between the left and right speaker cabinet.

Right cabinet:
Blue wire = wide blade = eventually connected to + binding post.
White wire = short blade = eventually connects to capacitors

Left cabinet:
Black wire = short blade = eventually connects to + binding post.
White wire = wide blade = eventually connects to capacitors.

Thanks, I think I get it now

westmassguy

Well got everything hooked up, and fired them up. Big difference between these and my CRS+s. These have a sound stage that's wider than my room, and I'm hearing things coming from the sides. Amazing

bmbguy

So it was a rather 'ear-opening' experience, was it? Congrats!

westmassguy

bmbguy wrote: »

So it was a rather 'ear-opening' experience, was it? Congrats!

You could say that. As I said, very different than the CRS+s. I know these pre-date the CRS+s by a few years, and have different drivers, but it's really profound. I'm wondering if the CRS+s were actually functioning properly. Going to have to do some testing with the CRSs.

TennMan

You should consider swapping your CRS+ crossovers and 6511 MWs into your 10B cabinets. (Keep 10B 6503 MWs on the inside and use 6511 MWs on the outside.) You might like what you hear. I did the swap a couple of months ago and really like the sound. It would be interesting to hear your input on how that combination compares to the 2As.

westmassguy

TennMan wrote: »

You should consider swapping your CRS+ crossovers and 6511 MWs into your 10B cabinets. (Keep 10B 6503 MWs on the inside and use 6511 MWs on the outside.) You might like what you hear. I did the swap a couple of months ago and really like the sound. It would be interesting to hear your input on how that combination compares to the 2As.

I read your thread on that with great interest. Regardless of what some people said, I thought it was a great concept. Glad it worked out for you. I'm a little hesitant, only because I just recapped the 10s, did the RDO-194 tweets and they sound real sweet. The CRS+s were recapped about 4 or 5 months ago, and they impressed me a lot, but these 2As, even though they're older than the CRSs have a whole different SDA effect for some reason.