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After installing the diaphragm back into the driver without the shim, the HF sounds amazingly....normal. Thanks for the installation page, Earl K.
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I feel like the guy who bought a used Servodrive sub and posted on the LAB about his problem with only getting one tone out of the sub no matter what he did.

Turns out the speaker connection used...

Well, this is the part where I go to the corner stool and sit with my pointy hat on :crying:

The spider shim was installed between the old dia and phase plug when I took the driver apart. My...

I ordered and received an 8-ohm diaphragm from GPA and installed it on the 288 over the past weekend. The issue I was having was a breaking up - VC rubbing sound using the replacement Simply...

More to come later today, including working to get the phase alignment right.

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Once we got the H1505 and top plate assembly rigged, we rolled the 30W5 under it and eased it down into place. For once in my life, something I built fit very well on the first try!

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I use SMAART 8 for and a couple different reference mics (mainly earthworks) for general measurements, so that's what I set up to work with the 816A/MR64 combo as well. I only have the one 1980s...

​I've had some quarantine time to work on this project. Finished cleaning the H1505 up, figured out how to build and mount it onto the top plate so it doesn't actually modify the 30W5 while still...

I couldn't figure out what if any serial numbers were on the two 515B drivers I picked up. It sure looks like a S/N on the one basket, but there is no such number on the other driver. What do the...

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I've never packed artifacts before, so we mounted the drivers on plywood, bagged the serial number tags in little parchment "teabags", and double-boxed them.
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I thought it was pretty strange to see such low DCR on the voice coils, and was worried at first. But wen you look at the schematic, you see the 415s are wired as a 3 ohm load...wow. The VCs still...

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Only five pictures per post, so here we go.

script56 now owns these. I hope he can post a thread with his project and plans for these.

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The 30W5 as mentioned was cut up by the Navy contractor tasked with building a safety rail for the loft where the speaker resided. Not quite enough room, so what's the answer? Cut out a notch in...

Hi JeffW - After looking at the practicalities of even a simple anti-rust job on the H1505, I have to agree with you that it would look too "new", especially on that beat up 30W5. No part job on it...

You might have noticed the caster plate we built and put under the 30W5 horn. It doesn't actually attach to the original horn, but the 2x2s keep it from sliding off as we move it around the shop. ...

Here's a few pics of the horn and dual-throat adaptor. One question I have is, since the horn has already been painted (when it went into the theater in Seattle where it lived all these years until...

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I thought it was interesting there were QC marks and touch-up paint at this corner. A piece of wood look like it had chipped away before it left the factory. The...

I've been meaning to do this for a while, but haven't had time until now, since my business is shut down for the foreseeable future :(

Thanks for your advice earlier,4345 and your idea about...

So now we have the cabinet, two 415 drivers, and the 220V cabling / low voltage signal cabling coming out of the junction box. that was attached. It looks like the 220V supply was cut off inside the...