DIY sub recommendations

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joeytvr

Member
2013-04-23 5:07 am
  • #1
    Looking for sub setup to go under cabinet. Space I have to work with is 7.5" tall 12" deep and 34" wide. I can get right at 8" tall and 10" deep letting box go up behind face of cabinet. I was thinking something like pony sub etc. And double it basically building two in one piece. Budget for sub or subs and crossovers around $200 would be great. I am a wood worker and metal fabricator with many years running car audio shop. Just say that as a complicated box design that makes smaller less expensive subs do the job I would love.
    Another though was to see how much room is in bottom of the cabinet and building something to slide in it. But not sure on vibration noises.
    Hk3390 reciever . Set of cabasse antigua 222's right now. Will be building overnight sensations MTM's after sub to replace them. Room is 15x24 . I sit 10ft straight from speakers. I like blues and classical older music from frank Sinatra to queen and so on. Wide range I know. Blues is my favorite and most played.
    Looking to do a 2.1 system I can also use for movies. I use just the cabasse at moment. Sound bar in pic needs to go to garbage. Lol
    Side note, what's opinion on center channel? And do you think the sensations is enough listening at moderate levels? For reference I am happy with volume of the Antigua's. Just moved living room into this configuration though and want to do something custom. 20200108_113651.jpg
    That's all the details I can think of. If there's questions on something please ask. I am very serious and not just day dreaming and respect alot of your opinions.
     
    Last edited:
    T

    Think

    Banned
    2017-11-07 1:36 am
    Den Haag, Holland
  • #8
    https://billfitzmaurice.info/AutoTruckTuba.html " TruckTuba has similar response to AutoTuba in a narrow box. The front dimension is 24 x 36 inches, and it can be made as shallow as 5 inches
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    "
    It is for cars and needs cabin gain to boost the low end. Not so good for a room.

    Go for a sealed sub and the low end gets a boost from your room, that compensates for the gentle roll off. Not the most efficient, but best SQ and you probably will never use it at max levels.
     
    Last edited:
    T

    Think

    Banned
    2017-11-07 1:36 am
    Den Haag, Holland
  • #10
    From post #1
    " Looking to do a 2.1 system I can also use for movies."


    So you want good low end.


    Tangband%20W6-1139G,%2038Hz%20TH_SPL.jpg


    The Tangband 38Hz Tapped Horn has even less low end. (<40hz)
    I assume you don't need discotheque sound levels at home, so better trade output for SQ and low end.
    Sealed sounds best and is easiest to integrate in your room (room gain) and system.

    Go for 2x sealed as 2 sound often better then one due to better placement options. 2nd sub gives +6dB. Better get 2 small ones then 1 big one, but in general bigger goes lower.


    With a sealed box(es), the shape is up to you and is most flexible as there is no horn or port to fit in and tune correct. Woofers best face a corner/wall instead of forwards like most setups.
     
    J

    joeytvr

    Member
    2013-04-23 5:07 am
  • #11
    Thanks for reply. Yea I'm thinking about doing a 8" inside that cabinet where old speakers went. Theres a big void at bottom. Maybe even have them fire back at wall. Sealed or basic ported. Use a dayton sub as they are easier to port than tang band if I go ported.


    Think said:
    From post #1
    " Looking to do a 2.1 system I can also use for movies."


    So you want good low end.


    Tangband%20W6-1139G,%2038Hz%20TH_SPL.jpg


    The Tangband 38Hz Tapped Horn has even less low end. (<40hz)
    I assume you don't need discotheque sound levels at home, so better trade output for SQ and low end.
    Sealed sounds best and is easiest to integrate in your room (room gain) and system.

    Go for 2x sealed as 2 sound often better then one due to better placement options. 2nd sub gives +6dB. Better get 2 small ones then 1 big one, but in general bigger goes lower.


    With a sealed box(es), the shape is up to you and is most flexible as there is no horn or port to fit in and tune correct. Woofers best face a corner/wall instead of forwards like most setups.
    Click to expand...
     
    Brian Steele

    Brian Steele

    Member
    2007-11-21 3:46 am
    www.diysubwoofers.org
  • #13
    That particular driver, the MCM 55-2421, has always intrigued me. A 8" driver with a 16mm Xmax for only $29? Something can't be right here. The Dayton DCS205, which is a decent but cheap 8" subwoofer driver, is $20 more...

    I suspect that 16mm Xmax is a peak-to-peak rating, so it's more like 8mm when comparing with other drivers that have Xmax defined properly, which still isn't too bad, but more like what I'd expect from an 8" driver with what seems to be an ordinary suspension and "cup" type spider.

    I ran a tracer on the impedance plot, ran the resulting ZMA file through the semi-inductance workbook and it came up with the following specs:

    Fs: 24.5 Hz
    Qes: 0.219
    Qms: 515.986 (!!)

    Re': 4.04 Ohms
    Leb: 0.702 mH
    Le: 4.008 mH
    Ke: 0.274 sH
    Rss: 252.812 Ohms

    Of course that Qms figure is ridiculously high, and I'd just use the published Qms instead - it's not going to make much difference to Qts anyway.

    I've seen this driver suggested for TH designs, but some sims I've done suggest that a simpler offset 1/4 wave damped line will produce similar results, without all of the out of band nastiness that you can get with a TL.

    I'd never build something for that driver without fully testing its t/s parameters though :)
     

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