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Speakers: "Manufactured For Sound Studios" Newark, Delaware

I always have to draw a schematic two or three times to get it looking neat so you're not alone. Usually I'll do a final version with the drivers woofer to tweeter going top to bottom and just one each of + and - inputs. But what you have there makes sense.

Seems like if there are two mids the upper driver should be a tweeter though and not a supertweeter, but what do I know? :dunno:

Interesting how the high mid basically uses whatever comes through that 2.2 uf cap that is not used by the tweeter. It is almost taking the place of an inductor placed across + and - of the tweeter (for a 2d order circuit). Very efficient design, parts-wise, and probably increases the sensitivity of the speaker compared to 'wasting' that portion of the signal back to ground.
 
Well, I was able to get some work done this weekend! Here is a work in progress pic of the new crossovers (audyn capacitors), and the new terminals after installation.

IMG_20190830_185311.jpg

IMG_20190831_142250.jpg

I added a brace to support the cut outs (it was a little flexy)

IMG_20190830_122930.jpg

I sanded and freshened up the cabs with watco medium walnut, and some satin spray paint. I sealed the speakers in the cabs with the foam tape from parts express. Everything electrical was soldered in place, no more junky connectors to corrode.

IMG_20190831_164402.jpg

And all of it was done in time to enjoy the release of Fear Inoculum! :rockon:

IMG_20190831_185948.jpg

These speakers were swapped in to replace a pair of Realistic Nova 7-B's (with Realistic super tweeters) connected to my Yahama CR-1000. So, that is what I'll compare them to. I love my Nova's (they are beautiful) but these speakers sound better. They are more efficient, and provide clarity at a wider frequency range. They have bigger bass and clearer highs (but, they also have bigger/more drivers). The sound stage feels more open and immersive. The pots in the back actually provide a noticeable change to the sound (I haven't always found that to be the case with speakers, but I don't have audiophile ears). Right now I have both pots (high and mid) turned up about 75% (I also have the bass on the amp turned up a couple of notches, and my powered sub reversed and crossed at 80hz). Fear Inoculum was amazing first album for these speakers.

TLDR

If you find a par of speakers that say "Manufactured for Sound Studios Newark Delaware" at your local thrift store for 4 bucks, they are totally worth a recap.
 
Let me get your opinions on something. Dayton sells a DC300-8 12" Classic Woofer that would basically drop into these cabs. They appear to be a little stouter. The voice coil is about twice the size. But, buying them would increase my investment in these speakers by about 1.5 times. Would you pull the trigger?

https://www.parts-express.com/dayton-audio-dc300-8-12-classic-woofer--295-320

It's nothing that I feel a pressing need to do. But, it's hard to resist the urge to tweak around with things.
 
Assuming these speakers were originally built properly, then no, matching a woofer to an existing system is extremely difficult to get right, especially if you're just picking one at random*. If you're curious, you could model the T/S parameters against the cabinet dimensions with WinISD to see how it would perform, but you could still have issues regarding crossover frequencies and level matching. Best to leave it as is.

*You'll find plenty of people who have done this and say it made an improvement, but if your goal is accuracy then my previous statement stands.
 
swechsler said:
Assuming these speakers were originally built properly, then no, matching a woofer to an existing system is extremely difficult to get right, especially if you're just picking one at random*. If you're curious, you could model the T/S parameters against the cabinet dimensions with WinISD to see how it would perform, but you could still have issues regarding crossover frequencies and level matching. Best to leave it as is.

*You'll find plenty of people who have done this and say it made an improvement, but if your goal is accuracy then my previous statement stands.
Click to expand...

Thanks. That makes sense.
 
I have a near perfect original pair of these same speakers myself. I've been searching on and off for years for more info and today I decided to use BING rather than Google and had the best results yet.

I've created a gallery of images titled Maximus Sound Corp and opened it up to the public to add more in order to create an archive for this brand.

I found a set of headphones in the original packaging on eBay, a really cool MSM mini speaker on 1st Dibs as well as a few entries in the Sept 1973 issue of Audio

I've seen a lot of correct speculation that they white-labeled their speakers for other brands. This is evidenced in the advert below.

Maximus Sound Corp Add

Maximus Sound Corp Add


There are a number of inquiries about a model 300 stereo receiver which indicates it was made in Japan. I would surmise from the speaker design and the fabric on my set that they too are from Japan. The fabric is reminiscent of Sansui or Pioneer grills.

The model speaker you and I have are the M-400 Ambassador. Here's a shot of mine.
Maximus Sound Corp M-400

Maximus Sound Corp M-400

Maximus Sound Corp M-400 Ambassadors


The Below image is a Specs sheet and comparison.
Maximus M-400 Specs

Maximus M-400 Specs

 
PSYLOPHILE said:
I have a near perfect original pair of these same speakers myself. I've been searching on and off for years for more info and today I decided to use BING rather than Google and had the best results yet.

I've created a gallery of images titled Maximus Sound Corp and opened it up to the public to add more in order to create an archive for this brand.

I found a set of headphones in the original packaging on eBay, a really cool MSM mini speaker on 1st Dibs as well as a few entries in the Sept 1973 issue of Audio

I've seen a lot of correct speculation that they white-labeled their speakers for other brands. This is evidenced in the advert below.

Maximus Sound Corp Add

Maximus Sound Corp Add


There are a number of inquiries about a model 300 stereo receiver which indicates it was made in Japan. I would surmise from the speaker design and the fabric on my set that they too are from Japan. The fabric is reminiscent of Sansui or Pioneer grills.

The model speaker you and I have are the M-400 Ambassador. Here's a shot of mine.
Maximus Sound Corp M-400

Maximus Sound Corp M-400

Maximus Sound Corp M-400 Ambassadors


The Below image is a Specs sheet and comparison.
Maximus M-400 Specs

Maximus M-400 Specs

Click to expand...

That's awesome! Thanks for sharing your research!
 
For speaker :bigok: entrepreneurs... the recent release of vintage speaker systems.. through estate sales and just "young folk don't like mom/dad's old stuff :crazy:"... have started these forensic speaker investigations nationally. Lots of these speakers are hybrids of sorts yet the innards can be from reputable brands.

It's great to see they are on the road to recovery with persons willing to go the rebuild distance and base that on the original manufacture specs.. sometimes very :deal: difficult to get.

Good luck.. and I am sure they will deliver on the sound expected :banana:.. even from years past!
 
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