Problem with SDA 1C's

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  • phxrider
    phxrider Posts: 58
    edited August 2008
    OK, I'll test it with one of the inner drivers at a time disconnected (with no crossover cable).
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    Oops I think it's actually the outer ones that are mains and the inners are the SDA speakers, and that would make more sense having the main speaker on the side of the ear that's supposed to hear it and the SDA on the side of the ear it's supposed to cancel out.

    Anyway, it seems that was the fastest diagnosis ever... I unhooked that offending driver and now it doesn't seem to be doing it any more.... I've been listening at a good volume for several songs and no distortion! I'll keep jamming it for a while to see what happens but I think this was it. Now to get a new driver....
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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    What driver is blown? MW__?
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    Oh, and THANK YOU ALL for the help and suggestions!
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    I'll pull the driver out again in a bit... right now I've falling in love with the sound of the speakers again (even with a missing driver and placement WAY too far from the wall they still sound sweet). Does MW-6511 or 6510 sound right? I did look when it was out but didn't write it down or anything. It's the lower inner mid/woofer of a left SDA 1C. I'll check it in a little bit though.
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  • treitz3
    treitz3 Posts: 19,196
    edited August 2008
    Glad to hear that you have isolated the problem and that you are back up and running again. Once you get the new driver, you'll be all set. Unfortunately, I can not assist you with which one to get. I haven't seen the 1C's I have purchased yet.
    ~ 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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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    That sounds right. Inners should be 6511's, and outers should be 6510's.
    Just check to make sure. Let us know. Polkies hook up Polkies pretty good here.
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • treitz3
    treitz3 Posts: 19,196
    edited August 2008
    Here, this will give you what you need....

    http://www.polkaudio.com/forums/showthread.php?t=55888

    Goto post #2, select 1C and open the file. Then select the driver you need.
    ~ 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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  • phxrider
    phxrider Posts: 58
    edited August 2008
    I actually pulled it out again and looked... It's a 6511.

    I can't believe it sounds this good with a driver pulled though, even with non-optimal placement. I moved them closer to the wall but I was to lazy to rearrange the whole room, so right now they are right up against a huge Pioneer Elite 58" projection TV, which puts the driver plane well behind the front of the TV. This is certainly not good for the SDA effect, but it still has that "sound coming from everywhere in the room" sound. I think it is also hurting bass response (that and the missing driver). This being said, it still sounds great. I can't wait to hear it with the driver replaced!
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  • Ron Temple
    Ron Temple Posts: 3,212
    edited August 2008
    The 6511 is the stereo driver, 6510 is the dimensional. I had a bad driver as well, a 6510...distortion and I was about 5dbs down on the right side. Once replaced I was right as rain.

    Combo rig:

    Onkyo NR1007 pre-pro, Carver TFM 45(fronts), Carver TFM 35 (surrounds)
    SDA 1C, CS400i, SDA 2B
    PB13Ultra RO
    BW Silvers
    Oppo BDP-83SE
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  • heiney9
    heiney9 Posts: 25,204
    edited August 2008
    ben62670 wrote: »
    That sounds right. Inners should be 6511's, and outers should be 6510's.
    Just check to make sure. Let us know. Polkies hook up Polkies pretty good here.
    Ben

    If they are in fact 1C's. 1A's; 1B's used the same driver for all (4) midwoofs.
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • Systems
    Systems Posts: 14,873
    edited August 2008
    ben62670 wrote: »
    That sounds right. Inners should be 6511's, and outers should be 6510's.
    Ben ,on the surface these drivers appear to be the same,are the differences in impedance and sensitivy?
    Testing
    Testing
    Testing
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    Mine are definitely 1C's.

    Schematic is here
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  • heiney9
    heiney9 Posts: 25,204
    edited August 2008
    GV#27 wrote: »
    Ben ,on the surface these drivers appear to be the same,are the differences in impedance and sensitivy?

    Yes, and Polk hasn't released any pertinent information on the measured differences of the various MW drivers used in SDA's. I believe Raife tried to get some info for the compendium but the info was proprietary.

    One of the differences I know of (according to Stereo Review) is the drivers in the 1C's use the same side wound voice coils as the SRS drivers of the day. The 1C's were the first non-SRS model to do that of that generation.

    H9
    "Appreciation of audio is a completely subjective human experience. Measurements can provide a measure of insight, but are no substitute for human judgment. Why are we looking to reduce a subjective experience to objective criteria anyway? The subtleties of music and audio reproduction are for those who appreciate it. Differentiation by numbers is for those who do not".--Nelson Pass Pass Labs XA25 | EE Avant Pre | EE Mini Max Supreme DAC | MIT Shotgun S1 | Pangea AC14SE MKII | Legend L600 | BlueSound Node 3 - Tubes add soul!
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  • lightman1
    lightman1 Posts: 10,794
    edited August 2008
    :DDid you buy these from Doro....??:D
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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    GV#27 wrote: »
    Ben ,on the surface these drivers appear to be the same,are the differences in impedance and sensitivy?

    stereos are 4ohms in series, and dims are 8ohms parallel
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    That was how it looked to me in the schematic... so how come, with one stereo driver unhooked, the other one still works? :eek:
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  • Systems
    Systems Posts: 14,873
    edited August 2008
    phxrider wrote: »
    That was how it looked to me in the schematic... so how come, with one stereo driver unhooked, the other one still works? :eek:
    Yeah according to the schem it shouldn't.Also the review in Stereo Review of the 1c claims only one driver is operating as the DA which is contrary to the schematic.
    Testing
    Testing
    Testing
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  • Systems
    Systems Posts: 14,873
    edited August 2008
    ben62670 wrote: »
    stereos are 4ohms in series, and dims are 8ohms parallel
    Ah OK thanks.
    Testing
    Testing
    Testing
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    So does anyone have a 6511 they're looking to unload? :)
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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    Polk ;)
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    GV#27 wrote: »
    Yeah according to the schem it shouldn't.Also the review in Stereo Review of the 1c claims only one driver is operating as the DA which is contrary to the schematic.
    That would also not make sense because of how the SDA system works - it relies on the DA's placement to the side of the main drivers.
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  • george daniel
    george daniel Posts: 12,096
    edited August 2008
    phxrider wrote: »
    So does anyone have a 6511 they're looking to unload? :)

    I might let me look
    JC approves....he told me so. (F-1 nut)
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  • phxrider
    phxrider Posts: 58
    edited August 2008
    ben62670 wrote: »
    Polk ;)
    I asked because I was under the impression they weren't available any more. I ordered one today, it comes out to around $70-75 with tax and shipping.

    'Nother question for the experts... when the inside of a cone is dented in, is there a way to pull it out?
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  • F1nut
    F1nut Posts: 50,735
    edited August 2008
    Try masking tape or the like.
    Political Correctness'.........defined

    "A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."

    President of Club Polk

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  • phxrider
    phxrider Posts: 58
    edited August 2008
    DAMN DAMN DAMN DAMN DAMN DAMN! It's not the drivers, I swapped both out and it still does it.... But it doesn't when the dimensional drivers are out of the circuit. Crossover?
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  • ben62670
    ben62670 Posts: 15,969
    edited August 2008
    phxrider wrote: »
    That was how it looked to me in the schematic... so how come, with one stereo driver unhooked, the other one still works? :eek:

    It sounds like someone was messing around in there. The stereo drivers should have black wires for the positive, and white for negative. On the dimensional the positive should be blue, and white.
    Do you have a camera?
    Ben
    Please. Please contact me a ben62670 @ yahoo.com. Make sure to include who you are, and you are from Polk so I don't delete your email. Also I am now physically unable to work on any projects. If you need help let these guys know. There are many people who will help if you let them know where you are.
    Thanks
    Ben
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