Weak SDA Driver?

stubby
stubby Posts: 723
edited February 2009 in Vintage Speakers
So dig, I was listening to my CRS (blade/blade) speakers and they didn't sound quite right. Almost no SDA quality. I re-checked phase and interconnect-good to go. I then did the full left-full right balance procedure. The sound went far to the right of the speaker, right side, stayed at the left cabinet when cranked full left. So, what do you guys think? Left SDA driver getting weak? I pulled it out and it was working, but hard to tell if it was stronger than the stereo driver. Thanks!

stubby
SRS 3.1TL
Harman Kardon Citation 5.1
Anthem AVM2



Post edited by stubby on
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  • stubby
    stubby Posts: 723
    edited January 2009
    More weekend update.....I swapped SDA drivers from left to right cabinets with no change. I did notice something even stranger than the usual strangeness. When I turn the balance all the way right, all the sound goes to the right side; way to the right. When I turn it all the way left, most of the sound goes left, but I still have some sound between the speakers. Whats up with that?
    Starting to think the crossover is kaput, OK, maybe just faulty. Any suggestions on where to start? I have a volt meter but not sure I have the intelligence to wield it.

    stubby
    SRS 3.1TL
    Harman Kardon Citation 5.1
    Anthem AVM2



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  • treitz3
    treitz3 Posts: 19,211
    edited January 2009
    Operator error.
    ~ In search of accurate reproduction of music. Real sound is my reference and while perfection may not be attainable? If I chase it, I might just catch excellence. ~
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  • stubby
    stubby Posts: 723
    edited January 2009
    treitz3 wrote: »
    Operator error.
    Could be. ALTHOUGH, I have had my thorzine drip for the day.
    SRS 3.1TL
    Harman Kardon Citation 5.1
    Anthem AVM2



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  • Dennis Gardner
    Dennis Gardner Posts: 4,861
    edited January 2009
    In a proper working SDA, you should get right channel from the left dimensional and left channel from the right dimensional drivers. The signal should be a diminished (lower) level than the main stereo driver's signal. This is how SDA works.

    If your description is correct, the dimensional driver is out on your left side. This should be labeled MW6511 and be placed on the far left (outside) of the cabinet. The stereo drivers are MW6510s and are to the inside of the cabinets.
    HT Optoma HD25 LV on 80" DIY Screen, Anthem MRX 300 Receiver, Pioneer Elite BDP 51FD Polk CS350LS, Polk SDA1C, Polk FX300, Polk RT55, Dual EBS Adire Shiva 320watt tuned to 17hz, ICs-DIY Twisted Prs, Speaker-Raymond Cable

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  • stubby
    stubby Posts: 723
    edited February 2009
    Dennis Gardner wrote: »
    In a proper working SDA, you should get right channel from the left dimensional and left channel from the right dimensional drivers. The signal should be a diminished (lower) level than the main stereo driver's signal. This is how SDA works.

    If your description is correct, the dimensional driver is out on your left side. This should be labeled MW6511 and be placed on the far left (outside) of the cabinet. The stereo drivers are MW6510s and are to the inside of the cabinets.
    Thanks for the input, Dennis. I swapped out the dimensional drivers with no change. They were labeled MW6503, matter of fact ALL mids were 03's. All were labeled SDA CRS and within a few weeks of each other on QC tests. I think they are original.

    stubby
    SRS 3.1TL
    Harman Kardon Citation 5.1
    Anthem AVM2



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  • stubby
    stubby Posts: 723
    edited February 2009
    And just to clarify my ramblings above, when I say the sound goes way to the right, I mean to the right of the speaker cabinet. Between the cabinet and the right wall. On the left side, sound does not extend past the cabinet. It stays betwixt the two cabinets.

    stubby
    SRS 3.1TL
    Harman Kardon Citation 5.1
    Anthem AVM2



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  • thsmith
    thsmith Posts: 6,082
    edited February 2009
    Could the problem be with your AMP or power source?
    Speakers: SDA-1C (most all the goodies)
    Preamp: Joule Electra LA-150 MKII SE
    Amp: Wright WPA 50-50 EAT KT88s
    Analog: Marantz TT-15S1 MBS Glider SL| Wright WPP100C Amperex BB 6er5 and 7316 & WPM-100 SUT
    Digital: Mac mini 2.3GHz dual-core i5 8g RAM 1.5 TB HDD Music Server Amarra (memory play) - USB - W4S DAC 2
    Cables: Mits S3 IC and Spk cables| PS Audio PCs
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  • stubby
    stubby Posts: 723
    edited February 2009
    thsmith wrote: »
    Could the problem be with your AMP or power source?
    I don't think so. Tried it on the living room system with the same results.
    Thanks for the driver info, Lasareath. I was hoping that was the case.
    I'm gonna check the drivers for resistance and see what that turns up.
    Thanks all.

    stubby
    SRS 3.1TL
    Harman Kardon Citation 5.1
    Anthem AVM2



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  • inspiredsports
    inspiredsports Posts: 5,501
    edited February 2009
    stubby wrote: »
    And just to clarify my ramblings above, when I say the sound goes way to the right, I mean to the right of the speaker cabinet. Between the cabinet and the right wall. On the left side, sound does not extend past the cabinet. It stays betwixt the two cabinets.

    stubby

    It almost sounds as if it is the left stereo driver (the louder of the two and the closest to the center) that is not generating enough sound.

    Grilles off, amp turned full left at medium volume, go to the left speaker and determine which driver is loudest.
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  • Stew
    Stew Posts: 645
    edited February 2009
    stubby wrote: »
    And just to clarify my ramblings above, when I say the sound goes way to the right, I mean to the right of the speaker cabinet. Between the cabinet and the right wall. On the left side, sound does not extend past the cabinet. It stays betwixt the two cabinets.

    How close is your left speaker to the side wall? If less than 3 feet, the sound stage will suffer on that side.
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  • stubby
    stubby Posts: 723
    edited February 2009
    Stew wrote: »
    How close is your left speaker to the side wall? If less than 3 feet, the sound stage will suffer on that side.
    I've got about 5 feet on both sides.

    stubby
    SRS 3.1TL
    Harman Kardon Citation 5.1
    Anthem AVM2



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