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SUPPORT FORUMS FOR DECWARE SPEAKER PLANS >> Wicked One Support Forum >> P21REX/DD
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Message started by Maximilian on 06/18/06 at 13:27:26

Title: P21REX/DD
Post by Maximilian on 06/18/06 at 13:27:26

First of all, helloooo just got here ;)

I've had this bassreflex subwoofer with Seas P21REX/DD 8" for a while but was never really happy with how it sounded so now I'm thinking about a WO for them and need a little input since I'm pretty much a rookie.
It's for home audio in a farely small room so will probably also be used as a table, in the 36*24" (10" high for 8" woofers right?) version.

Simulation 4th order bandpass:

Specs:
Fs: 33hz
Vas: 68.9l
Qts: 0.37
Qms: 2.36
Qes: 0.44
Spl: 91 dB

I don't know if it's a bad woofer for these kinds of subwoofer horn boxes.. doesn't seem to go very low before rolling off so.. What do you think? ???

Title: Re: P21REX/DD
Post by Maximilian on 06/18/06 at 15:19:16

I just realized I did the simulation under perfect conditions and not with the WO dimensions, will redo and check it!

Edit: Did a "quick" calculation of volume and fed it to WinISD resulting in:

Title: Re: P21REX/DD
Post by Maximilian on 06/18/06 at 17:19:59

Also, not to get myself lost in this early stage, have i got the drawing-bit right?

Title: Re: P21REX/DD
Post by 60ndown on 06/18/06 at 18:39:30

all looks good 2 me.wo works with almost any subwoofer.build with confidence ;D

Title: Re: P21REX/DD
Post by J_Rock on 06/19/06 at 02:51:57

Your drawing is spot on.

The second simulation, if correct looks better anyways.

The response may be slightly less sensitive, but it results in a larger flat response. It begins dipping off later around 40Hz, where in a small room it is not unheard of to begin getting room gain. So the drop off will be slower, if not close to none. Resulting in a nice flat response. I would build it, looking at its predicted response.

I would also build it because I absolutely love the design. Can't get enough of it. Its amazing, it will punch you in the chest, yet rumble your insides.

Title: Re: P21REX/DD
Post by Maximilian on 06/19/06 at 09:00:31

Ok thanks guys! Promise to get some pics up when I start the build :-*