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    Polk Audio MM840 DVC

    I've read a ton of great reviews on this sub i believe im going to get one any final advise?
    it will be ported in the trunk and 350W@2ohms....thanks for any feed back







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    Re: Polk Audio MM840 DVC

    for a boat, be more specific.




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    Re: Polk Audio MM840 DVC

    i didnt know a boat had a trunk! its going in a car




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    Re: Polk Audio MM840 DVC

    if you abuse them they won't hold up for long. but they sound good with very little space requirements.



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    Re: Polk Audio MM840 DVC

    i see u have the 10s well i wont abuse them im getting in my 30's now and want quality not quantity and im truck driver gone 95% of the year so they wont get used much but the xmax is rated high and the vids of the 10's look retarted i believe they will hit plenty hard enough with one 8 ported!!




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    Re: Polk Audio MM840 DVC

    yeah my 10's are pretty good but I think their rms is over rated though.



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    Re: Polk Audio MM840 DVC

    There is more to a "good" sub than just a high xmax figure.



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    Re: Polk Audio MM840 DVC

    got any other ideas for a 8 around $100 for sound Quality...ive looked at all of them!!!




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    Re: Polk Audio MM840 DVC

    Skar VVX 8 or DC LVL 2 but those are a little over $100. PM mylows10 for a price quote on the DC, he is a DC rep.

    skar link: SSA Store - SKAR Audio VVX Sub woofer note the low inductance, this is important for transient response, or the ability to sound musical and not boomy.

    The Infinity Reference series also comes in an 8 and sells for under $100. It has even less inductance than the Skar 8. The only downside is that it comes in svc 4 ohm only. Here's a link to it, the pdf downloads for the manuals arent working, but I have a pdf for the 8 on my pc, I'll see if I can dig it up. http://www.infinitysystems.com/car/p...=US&Region=USA

    copied and pasted from my pdf:

    SPECIFICATIONS
    DIAMETER: 8" (200MM)
    SENSITIVITY (2.83V @ 1M): 91dB
    POWER HANDLING: 250WR M S (1000WPEAK )
    FREQUENCY RESPONSE: 30HZ ~ 400HZ
    NOMINAL IMPEDANCE: 4 OHMS
    VOICE COIL DIAMETER: 2.0" (51.0MM)
    THIELE-SMALL PARAMETERS
    VOICE COIL DC RESISTANCE: REVC (OHMS) . . . . . . 3.30
    VOICE COIL INDUCTANCE @ 1 KHZ: LEVC (MH) . . . . . . . 2.31
    DRIVER RADIATING AREA: SD (IN2) . . . . . . . . 33.17
    SD (M2) . . . . . . . 214.00
    MOTOR FORCE FACTOR: BL (TM) . . . . . . . . 12.56
    COMPLIANCE VOLUME: VAS (FT3) . . . . . . . . 0.54
    VAS (LITERS) . . . . . 15.23
    SUSPENSION COMPLIANCE: CMS (μM/N) . . . . 232.70
    MOVING MASS, AIR LOAD: M MS(GRAMS). . . . 124.20
    MOVING MASS, DIAPHRAGM: MMD (GRAMS) . . . 122.40
    FREE-AIR RESONANCE: FS (HZ) . . . . . . . . 29.60
    MECHANICAL Q: QMS . . . . . . . . . . . 6.10
    ELECTRICAL Q: QES . . . . . . . . . . . 0.483
    TOTAL Q: QTS . . . . . . . . . . . . 0.45
    MAGNETIC-GAP HEIGHT: HAG (IN) . . . . . . . . .0.315
    HAG (MM) . . . . . . . . 8.00
    VOICE COIL HEIGHT: HVC (IN) .. . . . . . . . . 1.34
    HVC (MM) . . . . . . . . . . . 34
    MAXIMUM EXCURSION: XMAX (IN) . . . . . . . 0.513
    XMAX (MM) . . . . . . 13.00



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    Re: Polk Audio MM840 DVC

    yea i considered those but have u actually heard them???




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    Re: Polk Audio MM840 DVC

    Skar and DC no, Infinity, yes but it was sealed.



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    Re: Polk Audio MM840 DVC

    what did u think of the Infinity? i really thought about getting that one. is it the Infinity Reference 860W




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    Re: Polk Audio MM840 DVC

    Yea, it did pretty good for an 8. Its the only 8 that I've heard in person. SQ was great and it got fairly low due to the low fs and 13mm of xmax. It didnt get that loud to me, probably due to the sealed box and I'm used to hearing bigger speakers so I think I had high expectations. And the amp was a 250w rms so it wasn't getting much power after box rise. I recommended that a friend get one, after they heard my Ref 1262w's and wanted something better than stock. If I would have known about ported boxes then like I do now, I would have built a box for it.

    can't go wrong for $50 though. You could even get 2 and not go much over $100. In WinISD with .7cu/ft tuned to 30hz it yeilds an f3 in the mid 20s.

    http://www.google.com/products/catal...wAQ#scoring=tp



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    Re: Polk Audio MM840 DVC

    yea the price and the freq. range is what really draws me to get these there r so many choices out there though, but i think im gonna go with the Infinity!




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