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In Reply to: RE: Sansui SP-3005 project confusion posted by Don Reid on October 05, 2016 at 18:57:01
Thank you for the encouragement. This project exists only for fun/learning. I don't think they will be competition for my good speakers.
I find it fascinating how these speakers appear to be very good quality (1" thick braced enclosures, heavy nice looking drivers, well veneered cabinets, etc) but the design is at the same time very poor. At first I didn't believe the cabinet alignment could be deliberately designed so poorly but it appears to be so. It's no wonder you didn't like the sound. All the same, what an interesting time and place in history these are from.
Once I get the cabinets sorted out I sure hope the crossovers and mids/tweeters don't need an equal amount of rework. One thing that raised a bit of an alarm is that two different types of mids are in parallel! Will cross that bridge later though, the fake JBL style acoustic lens has me convinced these are good, for now.
Follow Ups:
I owned Sansui SP-2000 speakers, and they had a similar bass alignment. I think it was deliberate. These speakers were designed for the Japanese market where people live in tightly packed apartments and low base would only get you complaints by the neighbors. On the plus side, they were efficient as hell and the drivers operated in the range where they were very pistonic. The SP-2000's are a bit older than the SP-3005's and had all alnico drivers, that I believe were made by Coral.
Dave
Those ports look very similar to mine. I'm mid way done building new cabinets for the so-3005s, am excited to hear them!
Now that you mention it, while I have heard Sansui speakers I have never had a chance to take one apart to see what's what. It is always possible that good drivers were crippled by badly designed enclosures and/or crossovers. Stranger things have happened. I might have been a negative and overly critical person when I bad mouthed the drivers so quickly.
Maxhifi,
I bought a quite similar pair of Sansuis a decade ago, with both dual (different) mid "squawkers" and two tweeters, the only way for the woofer to "keep up" with that racket was the high Fb.
As was mentioned, a lot of the Sansui cabinets came home with Vietnam vets, after listening to helicopters, machine guns and land mines, they liked their rock & roll LOUD, and the Sansui's delivered.
Considering most Pop, Rock & R&B vinyl records of the time had little content below 50 Hz (other than warped records ;^) ) 65-70 Hz is missing only about 1/3 octave of content. The Altec Lansing A7 "Voice of the Theater" was tuned in that range too, as were most PA cabinets of the era. The Sansui at least used ducted ports, it was more common to just cut holes in the cabinet, 3/4" deep "ducts" were typical.
Things have changed gradually through the decades, used to be a solid 40 Hz was the "real deal", then around 1990 bass players started adding a 31 Hz Low B string to keep up with all the synth basses, now even bluegrass recordings have plenty of 25 Hz content.
Art
Hi Art,
Did you end up using your Sansui speakers? My living room system has klipsch la scalas, so this kind of bass roll-off isn't unfamiliar, and to be honest I listen to mostly older recordings on LP, so not a big problem. The la scalas however are well designed, and don't have any gross peaks or valleys in the response to color the sound.
still have yet to measure the second woofer, am curious to see if maybe they have deteriorate over time
Best regards
Max
"Did you end up using your Sansui speakers?"
Yes, I used one pair of mids and tweeters for my kitchen speakers, using a separate sub woofer, the other pair of mids went into patio speakers, and the woofers were given away to another vendor at the Albuquerque Flea Market before I moved down into the path of Hurricane Matthew.
Power just came back on after a 27 hour outage, considering the amount of trees taking down power lines all over, I was quite surprised to get power back today.
Art
Wow, that's a lot to endure! Hope everything ends up okay!
It's cool you re-used some parts from the Sansui speakers. I've been drawing out a schematic for the crossover, it's a bit of a mess. There's switches to bypass it in order to use three separate amps and an active crossover (which makes little sense to me considering this isn't that good of a speaker)The mid and treble level controls used tapped auto transformers, which double as inductors for the high pass filters. It is a full three way second order crossover though. Next I will measure all the chokes and driver impedance at crossover frequency and simulate it to see if anything weird is going on like with the bass alignment.
Edits: 10/09/16
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