Radio Shack Minimus 7 repair

[Ty_Bower]

I've got a set of old Radio Shack speakers. They're labeled RCA cat# 40-5000, which I believe are identical to the old Optimus 7, which are the same as the even older Minimus 7. One of them dropped and the tweeter assembly broke off its mounting plate. Does anyone know where I might find an identical replacement tweeter?

[Stuart Easson]

Those are quite different tweeters to the ones in my minumus 7's.

The 7's I own use a 1" soft dome, with a rectangular face/mounting plate.

Yours look very similar to the tweeters often sold as part of buyouts from parts express, and very similar to the tweeters Nelson Pass was giving away for a while. I'm not presently at home, but when I get back from my thanksgiving trip I'll try and remember to get some of them out of the box and take a picture for comparison.

Stuart

[planet10]

What is the dome diameter -- tyhiose are either Audax (or one of the zillions of clones that followed), thry cam in 2 sizes and in many versions.

The version i most often use is frame ApexJr, but you might have to fiddle with the mounting. You should also be able to fins some with the same face plate. )i just put one away the other day)

dave

[Ty_Bower]

I think you're right. They aren't from the 7. The speaker is smaller than the 7, but the die cast chassis construction appear nearly the same. Out of my set of five, two are labeled Optimus and three are RCA. Radio Shack seems to suggest they were the model RCA PRO-X33AV.

Where would I measure to specify the dome size? The outside is maybe ~25mm (1") but the actual dome part is maybe 12mm (1/2").

Cosmetically, you'd never be able to tell if I just stuck the pieces back together and epoxied them. Is it going to mess with the sound too much? Can I try to pull the dome back out? It's not as if they were exceptionally high fidelity speakers in the first place, but it'd be nice if the center channel matched the left and right.

[rherber1]

That tweeter (minus the escutcheon) looks almost identical to those used in the Infinity MICROII satellites. I am trying to find suitable replacements for a pair of these speakers but so far have had no luck. Infinity repair agents say they can't help either. So, if anyone can assist with further info I would be pleased to know about it.

BTW, the outer diameter of the plastic frame on the ones I have is just under 48mm.

[Moondog55]

Many posts on modifying and improving 'Minimus 7's" from memory most of them condcerned XO but a couple mentioned replacing the tweeter with the Vifa neo D26NC, saying the benefits outwayed the cost as the woofers in these were usually reasonable.
Jaycar in Oz have discontinued a tweeter that appears to be a direct drop in, must be some around in E###

[JLC7]

I doubt you'll be able to find an exact replacement for that tweeter. Radioshack outsourced those drivers from all around the world during the life of the minimus 7. Not all were created equal during that time.

I've owned 3 pairs of minimus 7's and none of them had the same drivers. The tweeters were the most obvious difference as some of them had completely different mounting flanges from each other. So you'll probably find something that fits, but it probably won't be to the same spec as the drivers made during that time period.

[planet10]

Originally posted by Ty_Bower
Where would I measure to specify the dome size? The outside is maybe ~25mm (1") but the actual dome part is maybe 12mm (1/2").

Audax called then 10mm & 14mm... they were, i believe, just taking about the inner dome. I'd get a pair of the ApexJr tweeters and mod the existing face play so you can use that to fix the tweeter to the box... shipping will be more than the tweeters )i've gone thru a 100 some of these).

http://apexjr.com/speakerstuff.html



dave

[Moondog55]

Dave wouldn't the "Sonance" tweeter with the flat face plate be easier to retofit?? by bringing the woofer out 5mm if needed, nice smooth graph comparitively good Fs too.
I wish we had that company here

[planet10]

Originally posted by Moondog55
Dave wouldn't the "Sonance" tweeter with the flat face plate be easier to retofit?? by bringing the woofer out 5mm if needed, nice smooth graph comparitively good Fs too.
I wish we had that company here

Could well do... i was just choosing the one most similar to the original.

dave