Diy sub - Home Theater Forum and Systems - HomeTheaterShack.com

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post #1 of 17 Old 07-16-17, 10:21 PM Thread Starter
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Diy sub

Car subs In a home theater. Build please help
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post #2 of 17 Old 07-17-17, 04:26 AM
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Re: Diy sub

Hi, Please describe in detail what you intend to do, what you have and what you aim to achieve so I can see if and how I can be of assistance.

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post #3 of 17 Old 07-17-17, 11:03 AM Thread Starter
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dual 4 ohm I wanna use as ho.e theater subs. I can, build new box,s right now they share a 25d x 14h x 34 1/2 w with a slot port 5w x 13h x28 deep tuned to. 34 I need them. Tuned lower I think. Specs

Re 1.7 dual4 ohm
Levc/mh 2.185
Fs 33.6
Sd/msqM 51.0
Bl 13.940
Qms 3.611
Qes 0.497
Qts 0.437
Vas 31.9
Cms/um/N 83
Mms 268.6 grams
Xmax 19mm
Can I tune this setup in the. 20hz range.
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post #4 of 17 Old 07-17-17, 11:04 AM Thread Starter
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I have a crown xls1502 to power them. They. Are 1000 watts rms a piece. I have 2 of them,
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post #5 of 17 Old 07-17-17, 02:29 PM
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Re: Diy sub

I hope I simmed it right on this quick one. It seems you will do well with each of those in a 3.5cuft(net) ported box tuned to 20hz. It looks like each can hit 112hz at 20hz with 1000 watts with a 3rd order highpass at 18hz. Two round ports 3.75 inch diameter and port length a little over 39 inches are needed. It's a compromise with many parameters at the border line but if I'm right you'll get it good down to 17hz.

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post #6 of 17 Old 07-17-17, 02:38 PM Thread Starter
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So I. Can tune them lower than. There. Fs can I ask. How. You figured this out. Can I use. 4 in pvc
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post #7 of 17 Old 07-17-17, 02:39 PM Thread Starter
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And. I only have the ability to. Do. 30hz high pass or I can. Do. BANDPASS how can I do. A 15hz 3rd order
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post #8 of 17 Old 07-17-17, 03:57 PM
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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..
Attached Files frog(1).pdf (320.3 KB) 

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post #9 of 17 Old 07-17-17, 05:28 PM Thread Starter
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Like a minidsp and 3.75 id pipe
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post #10 of 17 Old 07-18-17, 01:05 AM
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Re: Diy sub

You got it.

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