monitor 10 - no bass what gives?

lvas12
lvas12 Posts: 6
edited December 2008 in Vintage Speakers
just bought a pair of monitor 10s off of ebay. I have a couple pair of 7a and they always worked great. anywho, the 10's look to be in good shape but polk speakers alway look good (shiny black). when I first hooked them up - nothing came out of the mids and base - just sound from the peerless. didn't mind too much as I planned on recapping anyway. bought some soniccap 12uf the mills restorors and a jenzen 33uf and recapped and put one togehter tonight. mids and peerless sound great but there is no bass out of the reflex speaker at all - none zilich. now I know these have to be sealed great and checked everything and its all good and tight. when I had the tweeter off checking it I put it almost all the way back in and then tapped on the reflex speaker and I could hear the air whoosing out the tweeter opening - so everything esle was tight - then I went ahead and closed the tweeting down tight. but still no bass at all. I was putting 100 watts through it and the mids where so loud and high it was hurting my ears - but no bass. kinda got me stumped. what do I check next??
Post edited by lvas12 on
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  • treitz3
    treitz3 Posts: 19,197
    edited December 2008
    The woofer.

    You got a DVM?
    ~ 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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  • lvas12
    lvas12 Posts: 6
    edited December 2008
    well I think I know whats up -at least sort of. I did the push test on my monitor 7a and I can quite easly see when I push the relex speaker in the mid goes out in unsion. when I do that test on the monitor 10s - nothing. I push on the relfex and the mids stay still. actually the mids dont see flexable at all. when I push on them - they don't move. :eek:
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  • lvas12
    lvas12 Posts: 6
    edited December 2008
    looks like i paid to much for these ebay "like mint" speakers. the mids are frozen up something awful.
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  • hypertone
    hypertone Posts: 150
    edited December 2008
    The woofers are notorious for having the magnets come loose if they are dropped, which is very likely if they are shipped. It may be possible to fix them if you can fabricate some type of jig that will hold everything perfectly in place while the magnets are epoxied in place. I tried to fix one, but just mangled the voice coil.
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  • ben62670
    ben62670 Posts: 15,969
    edited December 2008
    They can not be fixed. I have had around a dozen frozen drivers over the years, and I have tried to fix them. No such luck:( You need replacements.
    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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  • dorokusai
    dorokusai Posts: 25,577
    edited December 2008
    A frozen driver is a garbage driver.
    CTC BBQ Amplifier, Sonic Frontiers Line3 Pre-Amplifier and Wadia 581 SACD player. Speakers? Always changing but for now, Mission Argonauts I picked up for $50 bucks, mint.
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  • ben62670
    ben62670 Posts: 15,969
    edited December 2008
    Doro is the 6503 the replacemnt for the 6500?
    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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  • skrol
    skrol Posts: 3,393
    edited December 2008
    hypertone wrote: »
    The woofers are notorious for having the magnets come loose if they are dropped, which is very likely if they are shipped. It may be possible to fix them if you can fabricate some type of jig that will hold everything perfectly in place while the magnets are epoxied in place. I tried to fix one, but just mangled the voice coil.

    Dang, that is probably why I lost a few Polk car speakers. The cones would freeze up. The road pounding and vibrations likely caused the magnets to shift. These drivers were very similar to the MW650x series. They were labeled Mobile Monitors MM6501 and MM6520.
    Stan

    Main 2ch:
    Polk LSi15 (DB840 upgrade), Parasound: P/LD-1100, HCA-1000A; Denon: DVD-2910, DRM-800A; Benchmark DAC1, Monster HTS3600-MKII, Grado SR-225i; Technics SL-J2, Parasound PPH-100.

    HT:
    Marantz SR7010, Polk: RTA11TL (RDO198-1, XO and Damping Upgrades), S4, CS250, PSW110 , Marantz UD5005, Pioneer PL-530, Panasonic TC-P42S60

    Other stuff:
    Denon: DRA-835R, AVR-888, DCD-660, DRM-700A, DRR-780; Polk: S8, Monitor 5A, 5B, TSi100, RM7, PSW10 (DXi104 upgrade); Pioneer: CT-6R; Onkyo CP-1046F; Ortofon OM5E, Marantz: PM5004, CD5004, CDR-615; Parasound C/PT-600, HCA-800ii, Sony CDP-650ESD, Technics SA 5070, B&W DM601
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  • gdb
    gdb Posts: 6,012
    edited December 2008
    lvas12 wrote: »
    just bought a pair of monitor 10s off of ebay. I have a couple pair of 7a and they always worked great. anywho, the 10's look to be in good shape but polk speakers alway look good (shiny black). when I first hooked them up - nothing came out of the mids and base - just sound from the peerless. didn't mind too much as I planned on recapping anyway. bought some soniccap 12uf the mills restorors and a jenzen 33uf and recapped and put one togehter tonight. mids and peerless sound great but there is no bass out of the reflex speaker at all - none zilich. now I know these have to be sealed great and checked everything and its all good and tight. when I had the tweeter off checking it I put it almost all the way back in and then tapped on the reflex speaker and I could hear the air whoosing out the tweeter opening - so everything esle was tight - then I went ahead and closed the tweeting down tight. but still no bass at all. I was putting 100 watts through it and the mids where so loud and high it was hurting my ears - but no bass. kinda got me stumped. what do I check next??

    Are the 6 1/2" speakers making sound (mid/woofers)?? Because if they are...I believe you've got an air leak somewhere or a damaged passive radiator. Try playing them in a draft free room while holding a candle close to all the driver edges and see if the flame gets blown sideways at all. If it does.....you'll know where you need to do some sealing, this thread shows a good method of sealing !:)

    http://www.polkaudio.com/forums/showthread.php?t=74524
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