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Kingnoob 9th March 2013 05:45 AM

SI sub?? help
I am getting the SI- 15" sub-woofer , does anyone own this is it better in a Sealed or Ported box for movies
one calc said sealed was best, but most sites say ported have higher Spl

Can a 500w Rms bash amp power it well? or do you know a cheaper better amp for the price
This ampBash 500W Digital Subwoofer Amplifier 300-752

Inductor 9th March 2013 10:42 AM

Do you mean this?
Stereo Integrity HT 15" Subwoofer

It works nicely in a bass reflex system, also sealed.
I advise you to use a VB = 130.5 L tunned to FB = 16.9 Hz. F3 is 25 Hz (19Hz in room).
Sealed system has F3~42Hz, so much different.


but most sites say ported have higher Spl
Sensitivity it's the same.
Ported: 1.00 m 121.5 dB (V=98.92 V, Pmin ~2057.6 W/4.8 Ohms/103.5 Hz)
Sealed: 1.00 m 114.2 dB (V=42.73 V, Pmin 493.6 W/4 Ohms)

m R g S r 9th March 2013 04:04 PM

Go on Check out the DIY subwoofer section. People love the SI subs....for The price they're great.

Kingnoob 9th March 2013 09:18 PM

which calculator is the best for DIY subwoofers??
The only thing that confuses me is how you wire this speaker to the bash amp?:confused:

Inductor 10th March 2013 01:50 AM

1 Attachment(s)
Quote: you wire this speaker
Is that a problem?

Inductor 10th March 2013 01:54 AM

Do you know how to use WinISD? others?
UniBox - Unified Box Model for Loudspeaker Design

Kingnoob 10th March 2013 03:09 AM


Originally Posted by Inductor (
Is that a problem?

Yes ! Exactly the problem :D I need help with that....

Kingnoob 10th March 2013 06:11 PM

wiring the SI Subwoofer to the bash amp is confusing.
What is better D2 model , or D4 sub:confused:
2+2 ohms = 4ohm in series I think.

So I should get the 2 ohm per coil version probably??:snowman:

Inductor 10th March 2013 08:49 PM

2 Attachment(s)

3 questions.

1st - With a 4 ohm amp I would want to buy the Stereo integrity 2+2 ohm per coil woofer right??

2nd- I want to know how to wire in Series this DVC sub-woofer for 4ohm to run with the bash-500 amp

3rd- Which amp would you suggest? To power Stereo integrity HT 15" Dual 2 Ohm subwoofer.
I don't know if the PM went trough or not so again,
The 500w rms bash amp is knowed as a very best in it's class by this forum. Others diy'ers can give you more references in what amp to choose.

2+2 Ohm DVC vs. 8+8 Ohm DVC
"2+2 ohms = 4 ohm in series",
or a 8+8 Ohm DVC (paralel), both are good for a 4 Ohm amp.
(In case you have a 4+4 Ohm DVC just connect one coil and will be fine.)

How to connect one DVC?
All speaker drivers are different, but all connections are almost identical.
Please refer to a printed pic.

1. DVC wiring. For a dual 8 ohm voice coil drivers in parallel (4 Ohm)
2. DVC wiring. For a dual 2 ohm voice coil drivers in series (4 Ohm)

Kingnoob 10th March 2013 09:54 PM

SO buying a 4+4 ohm Voice coil and hooking one coil up would give the Sub-woofer full power correct?
Or does a 2+2 series sound better, and deliver more power?

Now all I need to know is what sized Port I will need:D Ill look at calculators I guess.

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