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My Restoration of KLH Model 5...an Ordeal! Finished!

rotobadger

Suffering AZ Cardinals Fan
Subscriber
Thought I'd share a story about my restoration/fix-up of my recently acquired KLH Model 5 speakers.

First off, I want to be clear that I have little to no experience with wood restoration, paint, speaker repair, etc. This was a learning experience and an, at times, painful one!

So, as some of you may recall, I was able to purchase a pair of KLH 5s locally for a low negotiated price of $130. Part of the reason these went so inexpensively is that they had been painted black at some point in their life. It was not a good paint job either. The grill backs are original but the fabric was cheap black stuff.

Initially, I was going to live with their condition and sound but, after some chatting here and through personal messages, I was convinced that I should recap them. I ended up opening them up myself and took out the crossovers. I then shipped them off to a fellow AKer (Spark1) who has experience and knowledge. In retrospect, this was a very wise decision on my part. I think I could have ended up botching this part of the restore badly. Steve ended up doing the job perfectly.

While the cabs were sitting without their woofers in place, I decided "what the hell, I'm gonna strip off that awful black paint! How hard could it be? Shouldn't take too long!"

Three days later...

I won't go into all the details so as not to bore you all to death but I will say it was a slow, MESSY, frustrating, sore back-causing, wife annoying, 3 trips to the hardware store, and did I say messy, job. After about 3 hours into starting on the first speaker, I found myself wishing for a time machine so I could go back in time and stop myself from doing this. I would say, "Trust me! Black isn't that bad!"

But, I was in it and there was no turning back so I finished it. It's not perfect but it looks a million percent better than when I got them.

Other stuff I did:

Picked up the sticky tape surround gasket from Parts Express and replaced the old stuff with the new gasket around the woofers.

Resealed the surrounds with the Vintage AR goop.

Re-covered the speaker grills with, what I think is a low thread count, nice fabric. The color is much lighter than original but I really like that look. Bad news is, I think they may not be acoustically transparent and it's likely I'll replace the fabric with something more acoustically appropriate (assuming I can't source out the originals which are pretty much unobtanium).

Also, one big headache on the first speaker was, when I got the crossovers back, I replaced the first one and foolishly put EVERYTHING back together (stuffing, screws, switch knobs) before I tested it. When I plugged it in, disaster. It was badly distorted and my amp shut down into safety mode. Long story short, after opening it up again, I discovered I had inadvertently placed the separating washer on the lead connecting to the metal backplate on the wrong side of one of the screws. So, it was shorting out on the plate. Got that fixed and everything works great now.

I checked the cork inside the cabs and it had been replaced with putty. Looked like they were still fully intact so I didn't mess with them. I'm still unsure if the I'm getting a great seal so I've ordered another dose of Vintage AR sealer. RoyC suggested a third coat would be fine if I'm still not seeing a "slow return" on the speaker push test. Pretty sure the new gaskets I put into place are getting a good seal.

So, thanks for reading this long post. That's actually the short version of my one and a half week torture gauntlet. But, I posted a few pictures of before and after. Pretty happy with everything now with the exception of the speaker grill cloth. I also didn't do such a great job on applying them so I'll be more careful and buy the right glue in a few weeks when I figure out what to put on them.

Thanks for all the advice I received! Feel free to ask questions. I'm sure some here can learn from my mistakes and, sometimes, stupidity!IMG_7258.jpg IMG_7344.JPG IMG_7345.JPG IMG_7509.JPG
 
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Wow. Quite the transformation on the cabinets. Great work! But your story is pretty
much the norm on 'projects' :-)

To check for grille cloth transparency, pull one and compare it to the sound with it on.
If you haven't already. You might be fine.
 
Congratulations! You did a fantastic job. The Five's are certainly worth the effort. Now they'll not only sound great but look great too.

Enjoy!
 
Beautiful work, and well worth it as far as I'm concerned!
The grills look nice, but if inhibiting the sound, then it must be replaced. If you're after the vintage look, 123stitch has 18ct Lambswool linen that is an exact match to various vintage AR models including the 3a's. I've used it on numerous restorations and it looks fantastic. A bit pricy, but looks beautiful.
Cheers to you and your efforts.
Glenn
 
Good job,,, took a normal amount of time, in my experience,,, FWIW, I found a very low cost, excellent, generic speaker cloth... Its the "backing material" used for needle point,,, I tripped over it at a crafts type chain store (ACMoore,IIRC), its very porous, can see thru it, when held up to light.... Used it on this Rickenbacker git amp clone...
 

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Excellent restoration job on the cabinets!

Following up to RoyC's suggestions to check that the woofer returns slowly after pressing it in, this is actually a critical test to be sure the cabinet is full sealed. In addition to installing new gaskets for the woofers themselves, also the tweeter seal and the seal around the crossover board on the back make up the other ones that must be air-tight.

If not, the test RoyC suggests will not work well and you'll miss out on some the most awesome bass you've heard. Ask me how I know this!

Cheers,

David
 
Excellent restoration job on the cabinets!

Following up to RoyC's suggestions to check that the woofer returns slowly after pressing it in, this is actually a critical test to be sure the cabinet is full sealed. In addition to installing new gaskets for the woofers themselves, also the tweeter seal and the seal around the crossover board on the back make up the other ones that must be air-tight.

If not, the test RoyC suggests will not work well and you'll miss out on some the most awesome bass you've heard. Ask me how I know this!

Cheers,

David

I know how you know:beerchug:
 
It is my understanding that the cabinet must be adequately sealed, as opposed to completely sealed, to get the best bass frequencies performance. As I've suggested in your earlier thread and as reiterated above, run a bead of silicone caulk around the edges of the back plate (not the crossover board). Also as suggested earlier, the original thin foam gaskets on the tweeters can become leaky over time as the foam dries out. Replacing these may help. Assuming the midrange enclosures are well sealed, the gaskets on the mids are not as likely to be a source of excess leakage. And, if the rubber washers on the speaker posts (shoulder washer inside, flat washer on the other side) are dried out, they can leak...and also increase the risk of shorting thru the backplate.

Fortunately, your amp apparently has a well-designed protection circuit and did not suffer damage from the short you created. Many older amps, with or without protection relays, would not have fared so well.

Last thought....while the woofer return "test" is a good way to determine if the seal is adequate (that is, the seal is slowing the rate of air exchange enough to allow for appropriate cone movement while still providing good mechanical control), some folks seem to exaggerate the ideal return speed. I've seen threads suggesting it should take "a second or two". In my experience, the return should be noticeably slower than it would be in open air, but not much more than a second, at most. Unrealistic expectations in this regard can lead to chasing a problem that does not exist.
 
No KLH badges?

Probably going to pick up a couple once I settle on the grill fabric. But I agree, they need them.

Great job getting the paint off. What did you do for that?

I actually used a citrus based stripper that worked better than I expected. The trick was (I learned the hard way) to wait at least 30 minutes before removing it so it had time to soak in and loosen the paint.
 
It is my understanding that the cabinet must be adequately sealed, as opposed to completely sealed, to get the best bass frequencies performance. As I've suggested in your earlier thread and as reiterated above, run a bead of silicone caulk around the edges of the back plate (not the crossover board). Also as suggested earlier, the original thin foam gaskets on the tweeters can become leaky over time as the foam dries out. Replacing these may help. Assuming the midrange enclosures are well sealed, the gaskets on the mids are not as likely to be a source of excess leakage. And, if the rubber washers on the speaker posts (shoulder washer inside, flat washer on the other side) are dried out, they can leak...and also increase the risk of shorting thru the backplate.

Fortunately, your amp apparently has a well-designed protection circuit and did not suffer damage from the short you created. Many older amps, with or without protection relays, would not have fared so well.

Last thought....while the woofer return "test" is a good way to determine if the seal is adequate (that is, the seal is slowing the rate of air exchange enough to allow for appropriate cone movement while still providing good mechanical control), some folks seem to exaggerate the ideal return speed. I've seen threads suggesting it should take "a second or two". In my experience, the return should be noticeably slower than it would be in open air, but not much more than a second, at most. Unrealistic expectations in this regard can lead to chasing a problem that does not exist.
Hi Steve...I will likely look into your suggestions to further "seal" the cabs. I'm a little concerned that I may be, in fact, overthinking it as you suggested. I might be expecting too much "slow return" when they might actually be ok.
 
Just an update:

I am enjoying these speakers SO much. I think I may just put my Klipsch KG 4s on the market because these KLH speakers sound incredible.

Right now, Dave Brubeck sounds perfect.
 
Nice. I'm sure it was the updated crossovers that made all the difference.:)

Agreed! That's the biggest bang for the buck for the mids/tweets.

When you get a chance, raise those speakers up about a foot or so and see what happens to the sonic presentation.

Cheers,

David
 
47D1742B-5431-487C-9931-AAC501915668.jpeg
Agreed! That's the biggest bang for the buck for the mids/tweets.

When you get a chance, raise those speakers up about a foot or so and see what happens to the sonic presentation.

Cheers,

David
That’s exactly my plan! Any thoughts on these? The tilt back 5 degrees too.
 
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