building my SR124 Enclosure

KineticKinetic Posts: 437
edited December 2007 in Car Subwoofer Talk
Guys I recently download a software to design my sealed enclosure, this is for one Polk Audio SR 124 DVC Subwoofer ( I use Bass Box Pro)

CAJON%20POLK.gif

all the walls are going to be made of 3/4 MDF

height: 370 mm
Long: 780mm
deep: 227mm

for a total of (46.51 Liters) - (the little reinforcement in the middle)

the maximum recomended eclosure is 46.439 Liters (pretty close)


So is it my design ok?

How much space do i need between the bottom of the sub and the back wall of the enclosure?

the mounting depth is 7.6" and I have just have 0.588 inches between the bottom of the sub and the back enclosure wall.

is it a 1/2 inche, enough?
Z
/////Alpine CDA-9887 HU
/////Alpine KTX-1000EQ
/////Alpine PDX-4.150
/////Alpine PDX-1.1000
Polk Audio SR 6500
Polk Audio SR 124 DVC
KnuKonceptz MKS Kable

G35
/////Alpine CDA-9887 HU
/////Alpine KTX-1000EQ
/////Alpine PDX-4.150
/////Alpine PDX-1.1000
/////Alpine SPX 17PRO
/////Alpine SWX 1243D
KnuKonceptz MKS Kable
Post edited by Kinetic on

Comments

  • eloplayspoloeloplayspolo Posts: 1,117
    edited December 2007
    if u are going for sound quality i would go small as u can... i mean ur just gonna be louder if u go big. its my understanding, and i could be wrong, and please correct me if i am... but if u go with a smaller encloser your music is more true, meaning its going to sound how it should and not be artifical. It's also my understanding that a sub will actualy hit HARDER in a smaller box.
    2013 Toyota Prius
    Audible Physics 3 Way: H6MB, AR3-A, AR2.0
    Image Dynamics iDMax 12" D2v4
    (2) Alpine PDX-V9 Bridged, Alpine PDX-M12 (500w Mid-Bass, 200w Mid, 200w Tweet, 1200w Sub)
    Mosconi 6to8 v8
  • GLN305GLN305 Posts: 96
    edited December 2007
    Sq people will tell you to either use a larger sealed enclosure or a low-tuned ported enclosure.
  • black magicblack magic Posts: 799
    edited December 2007
    I'd go for a sealed box... 1.2 to 1.5 cubic feet depending on what you're looking for. 1.4-1.5 will give you a near perfect Q measure. A smaller box will sound more "tight" and quick and have more "punch", but will lack deep bass extension. a box too big will sound "boomy". The key is to find a good balance. Keep in mind that you can fry your sub easier if you try to push it hard in a box thats too small. If you have good mid-bass with your components, I'd go for a 1.4 ft3 box.

    But as for your concern, I think you're fine in regards to clearance.
  • KineticKinetic Posts: 437
    edited December 2007
    I'd go for a sealed box... 1.2 to 1.5 cubic feet depending on what you're looking for. 1.4-1.5 will give you a near perfect Q measure. A smaller box will sound more "tight" and quick and have more "punch", but will lack deep bass extension. a box too big will sound "boomy". The key is to find a good balance. Keep in mind that you can fry your sub easier if you try to push it hard in a box thats too small. If you have good mid-bass with your components, I'd go for a 1.4 ft3 box.

    But as for your concern, I think you're fine in regards to clearance.

    ok yes I think I have good midbass, i have a DB6500 component system, but im going to change them for a set of SR6500 in 2 or 3 months.

    and im planing to use the sub from 20 to 100 hz, and the DB6500 or SR6500 from 100 hz and up..

    so i think the 1.4 cubic feet should be ok, am I right?

    also my trunk its very big, does this can change my subwoofer sound?
    Z
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    Polk Audio SR 6500
    Polk Audio SR 124 DVC
    KnuKonceptz MKS Kable

    G35
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    /////Alpine SPX 17PRO
    /////Alpine SWX 1243D
    KnuKonceptz MKS Kable
  • KineticKinetic Posts: 437
    edited December 2007
    Guys I talk to Polk Audio tech support, and the told me that the SR124 DVC handles 1200 RMS Watts at 2 Ohms, is this correct?

    And what about the LPF crossover, can i put it on 20 - 100 hz?
    can i go more than 100hz? like 120 hz ?
    Z
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    Polk Audio SR 6500
    Polk Audio SR 124 DVC
    KnuKonceptz MKS Kable

    G35
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    /////Alpine SPX 17PRO
    /////Alpine SWX 1243D
    KnuKonceptz MKS Kable
  • black magicblack magic Posts: 799
    edited December 2007
    Those subs can take a beating, 1200 rms sounds a little too much, but if you're careful with your gain then you probably won't have problems.

    The freq. response for those subs is 20-200hz, so yes, you can go higher than 100, but if you go too high, the bass becomes localized and you can tell where the woofer is. You might even here some voices sound like they're coming from the woofer. Generally, most people will have the lpf at 80hz, but play around with it and see what you think sounds best.
  • KineticKinetic Posts: 437
    edited December 2007
    thanks, i would try the 80hz and the 100hz and i think no more than that.

    and the enclosure i go for the 1.4 feet3, as you told me, now we are redesigning the enclosure to give us 1.4.

    i would probably have some pictures in 2 weeks.

    PD: the SR124DVC looks beutiful, and is one of the best looking subs i have ever seen.
    Z
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    Polk Audio SR 6500
    Polk Audio SR 124 DVC
    KnuKonceptz MKS Kable

    G35
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    /////Alpine SPX 17PRO
    /////Alpine SWX 1243D
    KnuKonceptz MKS Kable
  • BruizerBruizer Posts: 27
    edited December 2007
    Just got my 2 SR124-DVC installed today with a Kicker SX1250.1 amp wired in at 1ohm putting 705watts to each sub. The box is 14x28x14 sealed and chambered which I think comes out to (after displacement) 1.02cft for each sub. They sound great, hit fast and accurate. Right now I'm just breaking them in, so in a week or so I'll probably turn the gain up a little because even with my Alpine HU's subwoofer level turned up to +15 it still takes a bit to get them loud. After break in and I get everything straightened out, I might go a little bigger with a 14.75x29x14.75 box which I believe came out to be (after displacement) 1.21cft for each sub. (This is all with 3/4 MDF.)
  • KineticKinetic Posts: 437
    edited December 2007
    Bruizer wrote: »
    Just got my 2 SR124-DVC installed today with a Kicker SX1250.1 amp wired in at 1ohm putting 705watts to each sub. The box is 14x28x14 sealed and chambered which I think comes out to (after displacement) 1.02cft for each sub. They sound great, hit fast and accurate. Right now I'm just breaking them in, so in a week or so I'll probably turn the gain up a little because even with my Alpine HU's subwoofer level turned up to +15 it still takes a bit to get them loud. After break in and I get everything straightened out, I might go a little bigger with a 14.75x29x14.75 box which I believe came out to be (after displacement) 1.21cft for each sub. (This is all with 3/4 MDF.)

    but for that sub you need from 1.2 to 1.5 cubic feet, the 1.0 cubic feet is for the SR104, plus the driver displacement.

    http://www.polkaudio.com/downloads/whitepapers/SR_WhitePaper.pdf

    page 12 (13 on the Adobe Acrobat Reader)

    i havent installed them i cant wait to listen to them, what is your opinion so far, can you compare them with other subs?
    Z
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    Polk Audio SR 6500
    Polk Audio SR 124 DVC
    KnuKonceptz MKS Kable

    G35
    /////Alpine CDA-9887 HU
    /////Alpine KTX-1000EQ
    /////Alpine PDX-4.150
    /////Alpine PDX-1.1000
    /////Alpine SPX 17PRO
    /////Alpine SWX 1243D
    KnuKonceptz MKS Kable
  • black magicblack magic Posts: 799
    edited December 2007
    Kinetic wrote: »
    but for that sub you need from 1.2 to 1.5 cubic feet, the 1.0 cubic feet is for the SR104, plus the driver displacement.

    http://www.polkaudio.com/downloads/whitepapers/SR_WhitePaper.pdf

    page 12 (13 on the Adobe Acrobat Reader)

    i havent installed them i cant wait to listen to them, what is your opinion so far, can you compare them with other subs?

    you're right, but the manual says 0.88 (net) + 0.14 (displacement) = 1.02 (gross). This is the absolute minimum, though. Its what I have now, although I think it sounds very tight and quick, I'm going to go bigger when building my next box b/c my components have good enough mid-bass, so the subs can sacrifice a bit of punch for bass extension
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