Sansui Speakers

Discussion in 'Speakers' started by Harvey/ Ga, Dec 5, 2017.

  1. man00

    man00 New Member

    Messages:
    48
    I bought a pair from Service Merchandise in the 80's. I can't recall the model but they were like the line radio shack and pioneer sold. Very dull sound as I remember
     

     

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  2. doctorolds

    doctorolds AK Subscriber Subscriber

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    1,790
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    Good question, and this has been brought up several times over the years. I started a thread on this topic and another member followed through and tested it on his Sansui woofers. In his opinion the results were good and he did a good job of documenting his procedures. Hopefully this will help some of the Sansui owners.

    https://audiokarma.org/forums/index...ning-hardened-cloth-speaker-surrounds.846570/
     
  3. FluxT

    FluxT Active Member

    Messages:
    171
    The SP5500X's I had definitely had some stiff surrounds, and probably would have benefitted from a redope. I did some averaged frequency sweeps when I first got them (granted, with a not flat mic in a not flat room), and the bass sharply cuts off around 120Hz. 80Hz at -3dB from 1kHz, 70Hz at -5B, and 58Hz at -10dB. Bear in mind my mic starts to gently roll off around 200Hz and I'm correcting it with a basic +6dB/oct at 100Hz. I have a copy of the original flyer, which shows a gentler roll-off occuring around 80Hz, and I'd guesstimate the -10dB point as being around the high 40's-assuming the curve wasn't just made up on the spot and that my mic correction is spot on. Still pretty lean for a 15" woofer, but it could show that the driver has lost some of its flexibility over the years. I doubt it was ever designed to have much excursion-much like how the old Caddy's used biiiiig V8's for smoothness and not raw horsepower, Sansui and others likely used the big driver to get a lot of sound without a lot of excursion (and thus distortion). Given that the Klipsch Heresy is also famously lean on the bass and famously efficient, I’d just accept it as part of the sound and not fret too much about it. To me, it’s part of the charm.
     

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    Last edited: Mar 15, 2019
  4. SpeakerLvr12

    SpeakerLvr12 New Member

    Messages:
    3
    I recently acquired (was given) a pair of Sansui SP-1700's. I was not very impressed with the overall sound. I spent some time reading about the speakers and decided to re-cap them before I got rid of them to a friend. Once inside the speakers I noticed that the mid drivers (squakers) were wired out of phase as compared to the tweeter and the woofer. (on both of the speakers) On the back of the crossover, the terminals for the woofers, squakers, and tweeters are clearly makers with + and -...and the speakers themselves are marked with positive and negative terminals. The negative terminal on the crossover was connected to the positive terminal on the back of the squaker enclosure, and the positive terminal connected to the negative. So I swapped them. I wonder if it was just a mistake in the factory or would they be wired out of phase on purpose?

    Since I had the speakers apart, I also removed the cardboard port tubes. (something I read about on one of the forums)anyway, when I got them back together the sound had improved dramatically. Prior to my tweeks they had almost no bass. I had to run the bass control on my amp at nearly full to get appreciable bass out of these speakers. After these changes I now run the bass control at about 1 pm and I have decent bass, and the mids now sound very realistic. Tom Petty's Wildflowers album sounded very detailed, esp the vocals.

    So if you are an owner of the sausui Sp-1700 you mkight want to check the mid drivers to see if they are out of phase.
     
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  5. SpeakerLvr12

    SpeakerLvr12 New Member

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    3

    and so after spending some time reading about 3 way speaker design...apparently it is common to have the mid drivers wired out of phase...so I opened up the sansui speaers..put them back to original...and they sound even better now...lol
     
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  6. rkgren1

    rkgren1 Super Member

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    What does removal of the port tube do for the speaker?
    Is it not sized properly?
     

     

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  7. nfafan

    nfafan Well-Known Member

    Messages:
    726
    Location:
    East Coast
    I also question the depth and width of the port tube (more accurately - a port ring...) on my SP-50's as well. It seems to only be a hair deeper than the "baffle board" itself, and looks a bit too wide for what is meant for.

    What is really bizarre is that area on the baffle board around the "mouth" of the tube had a thin, foam ring - reminiscent of the rings you sometimes see around tweeters - mounted to the surface which makes no sense to me.


    ETA - my port "ring" is not removable in that Sansui inserted the plastic ring in the hole and then used a staple to staple it - from inside the ring itself - to the baffle. Talk about fiddly attention to build quality...
     
    Last edited: Mar 25, 2019 at 12:51 PM
  8. SpeakerLvr12

    SpeakerLvr12 New Member

    Messages:
    3
    well...it is hard to say as I did two tweaks at the same time. I removed the port cardboard tubes and I partially removed some of the speaker dope with acetone. Before I did these tweaks, I would have to run the bass control at between +6 to +8 (+10 is the maximum setting on my amp) to get any decent bass out of these speakers, After the tweaks, I run the bass at +2 and I have plenty of bass. I canno tsay which tweak did the most. I suspect it was treating the surround.

    I should reinsert the port tubes and see if I get a reduction in bass. I will try that tonight when I get home and report back!
     
  9. Bodyblue

    Bodyblue AK Subscriber Subscriber

    Messages:
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    Location:
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    After reading this thread I had dig out my SP70s. I dont really care for the multi driver Sansuis but these 8in two ways in a big cabinet that is freaking heavily built sound amazing. In the pics they are on top of my Optimus 5s. And they go toe to toe with them.

    20190325_152618.jpg 20190325_152734.jpg 20190325_152650.jpg
     
  10. Ken Boyd

    Ken Boyd AK Subscriber Subscriber

    Messages:
    16,911
    Location:
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    I have the Sansui SP L700's don't use them much any more, but they are best Sansui speakers I have heard.

    2e5627d2f909c1714503a39040503ae3.jpg
     
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  11. rkgren1

    rkgren1 Super Member

    Messages:
    1,067
    Location:
    Yorktown, VA
    OK. I thought that I havd enough speakers, but now I have to look for some 10-series Sansuis.
     

     

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  12. Bodyblue

    Bodyblue AK Subscriber Subscriber

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    Like many speakers from the 70s that did not look exotic or have huge woofers etc they did not sell very well. Who wants an 8 in two way when for $25 more you can score some sweet looking units with 6 drivers and 12 in woofer? No matter that most had woofers way too big for their cabinet size and all those drivers smear the sound like crazy.

    The SP70 is a simple two way speakers with a great size cabinet and 8in woofer. Great bass and accurate sound.
     
    Last edited: Mar 25, 2019 at 8:47 PM

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