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In Reply to: RE: Sansui SP-3005 project confusion posted by maxhifi on October 05, 2016 at 22:18:10
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
Follow Ups:
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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