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Pioneer CS-88A Mod

wasillaguy

wasillaguy

Technician & Fishin'
Looking to mod my CS-88A's. I bought them missing 3 of the 4 tweeters (P/N 77-701F). I plan to keep looking for originals, but in the mean time wanted to get operational with some sort of replacement. Originals were (2) 16 ohm in parallel, but there's really nothing out there for replacements.
So, I'm thinking why not (2) 4 ohm in series?
This is a 4-way, and info I've found says the tweets cross in @ 3.5KHz. Super tweet takes over at 10KHz.

I've found a 4 ohm that will fit the existing screw holes and the cutout (except the terminals, I will need to cut notches :thumbsdn:)

SB Acoutsics SB26STAC-C000-4

https://www.madisound.com/store/product_info.php?cPath=45_229_324&products_id=8823

Fs is way down at 750Hz, resistance is nice and flat across the band of interest at about 3.7 to 3.9 ohm.

I'm new to this, so if a guru or two could critique my plan, I'd really appreciate it. I'm concerned about the unknowns, such as the characteristics of the original that I don't have details on- coil inductance, sensitivity, rated power, and how differences may effect the sound.
 
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Interesting idea. I have a pair of 88a's awaiting a tweeter refoam. If you don't need to use them right away I know tweeters come up on eBay every so often. You would probably spend less and would keep them original. Keep us posted on what you do.
 
Decided that with the cost of shipping to Alaska what it is, and the relative scarcity of these tweeters, and the cost of re-foam, I might as well mod these.
The SB Acoustics was pretty pricey though, so I went with BC25TG15-04 instead. $12.50/ea from Madisound.
New Daytons in the crossovers and fired 'em up. Came out a little too bright for my taste, so set the crossover selectors for min tweet and mid bass. I like. So much more sensitive than my Bose. These are rated for 80W, but I doubt they'll ever see more than 10 or 20W for my needs.
 

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Glad this worked out for you. I like these speakers. I'm currently listening to their slightly smaller sibling, the CS-77a's. I really like the 77a's - seem more coherent and throw a better soundstage. Trying to find the time to recap these.
 
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