diyAudio Forums Archive > Top > Loudspeakers > Subwoofers Reccomend a box for this driver - Click HERE for Original Thread greg_mcquaid Hi, I would like to know what box you guys would reccomend that would get me down to 20hz using the following driver: Re: 3.7 ohms Le: 1.30 mh Fs: 23.5 Hz Qms: 2.73 Qes: 0.416 Qts: 0.361 Vas: 61.6 Ltr Mms: 232 g Cms: 0.35 mm/N Sd: 468.7 Cu Cms Bl: 17.46 T-M Xmax: 15mm I hope the driver is pretty good as it is cheap and available on my side of the pond. atb, greg sreten Hi, what is the driver ? some very good numbers there, may not be right. :)/sreten. greg_mcquaid Its the driver from this subwoofer that bk electrnics produce: http://www.bkelec.com/HiFi/Sub_Woofers/monolith.htm The driver is based around a lab12 i think. greg. sreten Hi, well according to the numbers its an excellent driver - but who sells it ?- I can't see anywhere on Bk site where you can buy it. :)/sreten. greg_mcquaid sreten here's the link: http://www.bkelec.com/HiFi/Drive_Un...monolith_du.htm Ive come up with a design in unibox, il post the graphs to see what you think (it probs needs improving). Here's some stats on the design: VB: 65l FB:21.00 F3: 20.32 2 ports (8.00cm Dia) with a total length of 99.56cm. 106db at 20hz Here's the graphs: Response Graph - http://img59.imageshack.us/img59/72...ithdrivean4.gif Excursion Graph - http://img59.imageshack.us/img59/99...lithdrivfv5.gif Am i on the right track? Thanks, Greg GM Greets! It may be OK, but the long vent's pipe harmonics won't be completely damped by flaring the ends, so they may need additional damping, which will lower output somewhat, so I'm thinking a lower tuned ML-TQWT may be a better alignment overall, though a bit larger: L = 101" SO = 200"^2 SL = 19.635"^2 zdriver = 6" zport = 98.5" Folded up, both the driver and vent cutout will be at floor level for max boundary gain. Sim shows minimal stuffing, so adding more further smooths it and rolls off the bottom end if it sounds too 'boomy' in-room. GM GM As opposed to this 45" high bottom firing sim using your alignment with the same amount of stuffing, though it doesn't show any damping due to any vent flaring: sreten quote: Originally posted by greg_mcquaid s Am i on the right track? Thanks, Greg Hi, Just my opinion but flat alignments can sound boomy, I like to tune the ports lower than that that gives flattest response, but each to there own - possibly get an adjustable port and try in situ. :)/sreten.

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