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In Reply to: RE: Sansui SP-3005 project confusion posted by maxhifi on October 04, 2016 at 23:01:53
I could find barely any info on these in English, so decided to search yahoo.jp. Up came lots of stuff, of course, I can only look at the photos, but the frequency response graph doesn't show any huge peaks in the bass region.
I tried doing OCR and then google translate, but the result is beyond gibberish.
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Looks like SP-3005s were intended for Japanese market, maxhifi. Using experience from previous 'sui speaker projects, put a 12 uf polyprop on large mid-range driver along with direct-wiring woof(no coils nor inductors). You'll elicit bomb-tastic bass from woof, combined with fat mid response. For those mid squalkers surrounding the tweets, wire them in series & a 6.8 uf polyprop should suffice. Will solidify upper mid response quite nicely. Put a 4.7 uf polyprop on one tweet, & 2.2 uf polyprop on the other. Being positioned side-by-side rather than one on top of the other(like with SP-2500), it shouldn't make much difference which tweet gets which polyprop value. So just use personal preference. Mod one speaker, then compare it to stock. Results should be quite startling. 73s para Sactown
Thanks for the ideas! I am about to make a cap order at parts express for the original values, wil toss in some polypropylene caps too for later experimentation. Looking at the frequency response chart I can see this speaker is naturally very strong in the mids! I have an idea that I could also use my minidsp to fix things up a bit, with a small single ended triode amp on the mids and tweeters, and the big powerful push pull amp on the woofers.
I have to wonder how such a pair of foreign speakers, for which Information only seems to exist in Japan first of all ended up here in Canada, only to be abandoned and mistreated and eventually rebuilt.
Cabinets are coming along, so far I've got them built out of 3/4" birch plywood, all corners blocked and glued and screwed, in the spirit of how Sansu made cabinets. The baffles are mounted, and next step is to make cutouts for all the drivers, and then Have them finished. I am going to make a mirrored pair rather than two identical speakers, just because I can so why not. Definitely a bit slower going than I had hoped but should have some sound in a few weeks!
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