SDA-1C Project

westmassguy

This was a straight forward upgrade. Clarity PX Caps, Mills Resistors, Erse Super-Q Sub Bass Inductors, Insulating Binding Posts, and Conversion to SpeakONs for the Interconnect. I developed a new Mounting Plate when the original Sub Bass Spool Inductors are no longer needed. This keeps everything in one place, and makes it easier to mount. The Circuit Boards are attached with short, nylon risers, and the new Super-Q Inductors mounted adjacent to them. The Plate has a 1/4-20 Hurricane nut in the center, and new shorter Cap Screws are provided.
The Binding Post Cup was modified, with new Insulating Binding Posts, SpeakON Connectors (and rubber gaskets, thanks Jesse). Lastly, a New #10 Gauge OFC Interconnect Cable was fabricated.

Faustin

Nicely done.

westmassguy

Thanks Bruce

nspindel

Nice!

westmassguy

Thanks Neil

pumpkinman

Good morning David,
1st off thanks again for sharing. I have a question regarding the use of 10 gauge cable. I to made mine from 10 gauge but had difficulty in getting the stripped ends into the SpeakOn connector. Are there different connectors that allows one to use heavier gauge cable ?? Mind you I managed O.K. but would like to know for the future.

Thanks
P-man

westmassguy

pumpkinman wrote: »

Good morning David,
1st off thanks again for sharing. I have a question regarding the use of 10 gauge cable. I to made mine from 10 gauge but had difficulty in getting the stripped ends into the SpeakOn connector. Are there different connectors that allows one to use heavier gauge cable ?? Mind you I managed O.K. but would like to know for the future.

Thanks
P-man

What I do, is loosen the set screws on the SpeakONs just to the point where they almost fall out. I then take a Phillips Head, Jewelers Screwdriver, and insert it in the connector to expand the inner sleeve fully. It's still a PITA to get #10s in without a few strands popping out, but with practice, you can do it.

voltz

You should see the cable I gave Dave to put SpeakOn's on, there the "Analysis Plus" oval 12's. After I got them I was looking at them thinking wow is this going to work?

westmassguy

voltz wrote: »

You should see the cable I gave Dave to put SpeakOn's on, there the "Analysis Plus" oval 12's. After I got them I was looking at them thinking how is this going to work?

It's a flat braid. I should be able to work something out. If not, I'm coming to Kansas and beat you with them!

pumpkinman

I like to meet Voltz. I'll go with you but I want to meet him before you start whooping him.

PolkieMan

Nice work Dave. That one cap in the upper right hand comer I would put some under it for support, no?

westmassguy

PolkieMan wrote: »

Nice work Dave. That one cap in the upper right hand comer I would put some under it for support, no?

It has 3M VHB Tape under it, and Double, Heavy Duty, Nylon Wire Tie Belly Bands holding it in place. I couldn't pull it off even if I wanted to. How much more support would you suggest?

PolkieMan

I was thinking of filling in underneath the board with hot glue.

westmassguy wrote: »

PolkieMan wrote: »

Nice work Dave. That one cap in the upper right hand comer I would put some under it for support, no?

It has 3M VHB Tape under it, and Double, Heavy Duty, Nylon Wire Tie Belly Bands holding it in place. I couldn't pull it off even if I wanted to. How much more support would you suggest?

westmassguy

PolkieMan wrote: »

I was thinking of filling in underneath the board with hot glue.

westmassguy wrote: »

PolkieMan wrote: »

Nice work Dave. That one cap in the upper right hand comer I would put some under it for support, no?

It has 3M VHB Tape under it, and Double, Heavy Duty, Nylon Wire Tie Belly Bands holding it in place. I couldn't pull it off even if I wanted to. How much more support would you suggest?

I don't see the point of filling in under the crossover with hot glue. The circuit boards are secured to the new back plate with Nylon Stand-Offs that are screwed in place, unlike the original Polk Stand-Offs that merely snapped in. The large cap weighs a few ounces. The Inductor next to it weight 10 times more, and needs no additional support. You're looking at the crossovers laying on their backs. They're mounted vertically in the speaker cabinet, and there will be no added stress on them. I never use hot glue on a crossover unless there's no other alternative. It's fine for sealing the backs of the binding post cups, but for holding components in place, there are much better alternatives.

MrBuhl

Quality work as usual David! I gotta get to my 2b's someday soon!

westmassguy

Thanks Ed

bdibble

I can attest to the brilliance of the mounting plate. The build was so nicely done it was almost ashame to tuck them away in my cabinets...thank you David! They sound wonderful, my wife lets me turn them up to levels she would scream at me before. Life is good.

westmassguy

bdibble wrote: »

I can attest to the brilliance of the mounting plate. The build was so nicely done it was almost ashame to tuck them away in my cabinets...thank you David! They sound wonderful, my wife lets me turn them up to levels she would scream at me before. Life is good.

Was my pleasure Brian

JNinja

Looks very nice. If I'm understanding correctly, you did this all for a 'client'. How much would you charge to do my SDA-2A's?

westmassguy

JNinja wrote: »

Looks very nice. If I'm understanding correctly, you did this all for a 'client'. How much would you charge to do my SDA-2A's?

I don't conduct business directly through the forum. Sent you a PM

PolkieMan

Getting all of that to fit on a standard board is a well thought out process done perfectly.

westmassguy wrote: »

PolkieMan wrote: »

I was thinking of filling in underneath the board with hot glue.

westmassguy wrote: »

PolkieMan wrote: »

Nice work Dave. That one cap in the upper right hand comer I would put some under it for support, no?

It has 3M VHB Tape under it, and Double, Heavy Duty, Nylon Wire Tie Belly Bands holding it in place. I couldn't pull it off even if I wanted to. How much more support would you suggest?

I don't see the point of filling in under the crossover with hot glue. The circuit boards are secured to the new back plate with Nylon Stand-Offs that are screwed in place, unlike the original Polk Stand-Offs that merely snapped in. The large cap weighs a few ounces. The Inductor next to it weight 10 times more, and needs no additional support. You're looking at the crossovers laying on their backs. They're mounted vertically in the speaker cabinet, and there will be no added stress on them. I never use hot glue on a crossover unless there's no other alternative. It's fine for sealing the backs of the binding post cups, but for holding components in place, there are much better alternatives.