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  Topic Review (Newest First)
07-18-17 12:48 PM
Toffkanda
Re: Diy sub

I'm not sure if your reference to svs port is a consideration of changing to a slot /square port. If you do that you must take care that the slot port surface area equals the sum of the surface areas of the two 3.75 in diameter ports and the port length will need to be re-simulated.

If the intended net volume has been accurately implemented, all you need is 1.5 inch acoustic foam lining the internal walls of the box to kill resonances.
07-18-17 11:50 AM
feelinfroggy1330 Yeah. I will build. 2 boxers @ 3.5 net after braces speaker displacement idint know I needed flare ports but I can do that should I do. Front ports or back or build it like. A svs short square but deep. Do I need to. Dampen the inside of the. Box with polyfil or foam
07-18-17 11:36 AM
Toffkanda
Re: Diy sub

I just didn't know how to. Do. The 15hz high pass

It's 18hz not 15. You just get the dsp you want (minidsp, the higher types of dbx driverack, behringer dcx and I think rane dsp) and you simply key in the settings for 3rd order 18hz highpass and you're done.
07-18-17 10:56 AM
feelinfroggy1330 The box sounds pretty straight forward or is there something I am missing I know. My sub takes up .14cuft3 I will need to factor that. In building the. Box and some braces inside. Prob round dowel good glue screws and any advice you have. I just didn't know how to. Do. The 15hz high pass
07-18-17 03:36 AM
Toffkanda
Re: Diy sub

I don't have enough experience with these DSPS perhaps someone else might chime in but my understanding is that minidsp has distinct advantages and with the mic you not only implement the filters but also measure, set up and eq your entire system.
I actually would have anticipated that you would be asking more about the details of building the boxes. Perhaps you've understood that aspect very clearly.
07-18-17 01:16 AM
feelinfroggy1330 Or like a dbx drive rack
07-18-17 01:07 AM
feelinfroggy1330 Should I get the. Dsp with. The. Mic or just the. Dsp
07-18-17 01:05 AM
Toffkanda
Re: Diy sub

You got it.
07-17-17 05:28 PM
feelinfroggy1330 Like a minidsp and 3.75 id pipe
07-17-17 03:57 PM
Toffkanda
Re: Diy sub

Check out WinISD.
3.75 inch pipe is the absolute maximum port diameter. Any bigger and the port gets long enough for its pipe resonance to distort the sub's sound.
I have attached the spl graph here from WinISD to see how the 20hz tuning was done.
The 30hz highpass on your amp is not useful for home theatre subs. Disable it and get a loudspeaker management system, put it before the amp to implement the 18hz 3rd order highpass (not 15hz) as well as a 4th order low pass which you will need at about 80hz..
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