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Dtour
10-18-2007, 11:09 PM
I have a 03 civic 4 dr, I want to go IB and wondering which drivers will sound great, any advice is welcome

Immacomputer
10-19-2007, 12:09 AM
Look for something with a Qts higher than ~.5 or so and a low Fs (lower than about 28hz). Those two things will help you find a woofer that will get low and should sound very nice.

The Qts value of the sub will be your Qtc value and it will be the alignment that you will be left with if it is a true IB system.

Dtour
10-19-2007, 12:36 AM
what about a qts of .37 and a Fs of 20hz?

req
10-19-2007, 01:14 AM
he said higher than .5 man. but that fs is right.

is that the aura one?


but then again, the idq has a qts of .25 and a fs of 20hz. so it might work well. those numbers are just rules of thumb that make any driver sutible for this application.

hayden
10-19-2007, 01:17 AM
Q series from Fi. Scott will make adjustments to them so that they are perfect IB drivers. He as done this for numerous HT guys. You can also get a killer deal on four of them.

JP

Immacomputer
10-19-2007, 11:26 AM
what about a qts of .37 and a Fs of 20hz?

It can work, just like the IDQs and it will probably get pretty low with that Fs. What subs are you looking at? Other parameters do matter as well and just looking at Qts and Fs is kind of over generalizing.

Dtour
10-19-2007, 06:17 PM
Aura Sound

NS15-992-4A


Nominal Diameter . . . . . . . . . . . . . . .15 inches (393 mm)
Nominal Impedance (Z) . . . . . . . . . . 4 Ohms
Sensitivity, 1W/1m (E) . . . . . . . . . . . 86 dB @ 100 Hz
Power Capacity, RMS (Pe) . . . . . . . . 800 W
Power Capacity, Peak . . . . . . . . . . . 3200 W
Frequency Range (-10dB) . . . . . . . . Fo - 1.5 kHz
Minimum Impedance . . . . . . . . . . . . 5 ohms
Voice Coil Diameter . . . . . . . . . . . . . 99.2 mm
Voice Coil Winding Length (h) . . . . . 25.4 mm
Voice Coil Number of Layers (n) . . . . 1
Voice Coil Former Material . . . . . . . . Glass composite
Voice Coil Wire Composition . . . . . . Aluminum Ribbon
Magnetic Material . . . . . . . . . . . . . . Neodymium radial
Stray Flux Shielding . . . . . . . . . . . . . Inherent
Magnetic Gap Depth (He) . . . . . . . . 50.8 mm
Cone Material . . . . . . . . . . . . . . . . . Aluminum
Surround Material . . . . . . . . . . . . . . Injecton molded rubber
Polarity, Outward Motion . . . . . . . . . Positive voltage on (+) terminal
Net Weight . . . . . . . . . . . . . . . . . . . . 20.1 kg
Thiele / Small Parameters
Resonant Frequency (Fo) - Fs . . . . . 20 Hertz
Voice Coil DC Resistance - Re . . . . . 3.3 ohms
Total Q - Qts . . . . . . . . . . . . . . . . . . 0.37
Mechanical Q - Qms . . . . . . . . . . . . 8.0
Electrical Q - Qes . . . . . . . . . . . . . . 0.40
Equivalent Volume of Air - Vas . . . . . 169 L
Radiating Piston Area - Sd . . . . . . . . 765 cm 2
Electrical / Mechanical Parameters
Flux Density x Length - BL . . . . . . . . 18 Tesla-meters
Compliance - Cms . . . . . . . . . . . . . . 206 mm/N
Total Mass - Mms . . . . . . . . . . . . . . 314 grams
Impedance
Frequency Response (1W, 1m)
Maximum Excursion . . . . . . . . . . . . . 75 mm peak to peak
Xmax . . . . . . . . . . . . . . . . . . . . . . . . 38 mm peak to peak
Distortion (1W, 1m)

I purchased one last night, read a ton of reviews and have yet to find anything negative about them, these ar used in Wilson Audio cabs

Immacomputer
10-19-2007, 06:34 PM
Actually, yes, I think those would work out very well in an IB environment. They should get pretty low and should be very smooth sounding.

IamDeMan
10-19-2007, 06:39 PM
Aura Sound

NS15-992-4A


Nominal Diameter . . . . . . . . . . . . . . .15 inches (393 mm)
Nominal Impedance (Z) . . . . . . . . . . 4 Ohms
Sensitivity, 1W/1m (E) . . . . . . . . . . . 86 dB @ 100 Hz
Power Capacity, RMS (Pe) . . . . . . . . 800 W
Power Capacity, Peak . . . . . . . . . . . 3200 W
Frequency Range (-10dB) . . . . . . . . Fo - 1.5 kHz
Minimum Impedance . . . . . . . . . . . . 5 ohms
Voice Coil Diameter . . . . . . . . . . . . . 99.2 mm
Voice Coil Winding Length (h) . . . . . 25.4 mm
Voice Coil Number of Layers (n) . . . . 1
Voice Coil Former Material . . . . . . . . Glass composite
Voice Coil Wire Composition . . . . . . Aluminum Ribbon
Magnetic Material . . . . . . . . . . . . . . Neodymium radial
Stray Flux Shielding . . . . . . . . . . . . . Inherent
Magnetic Gap Depth (He) . . . . . . . . 50.8 mm
Cone Material . . . . . . . . . . . . . . . . . Aluminum
Surround Material . . . . . . . . . . . . . . Injecton molded rubber
Polarity, Outward Motion . . . . . . . . . Positive voltage on (+) terminal
Net Weight . . . . . . . . . . . . . . . . . . . . 20.1 kg
Thiele / Small Parameters
Resonant Frequency (Fo) - Fs . . . . . 20 Hertz
Voice Coil DC Resistance - Re . . . . . 3.3 ohms
Total Q - Qts . . . . . . . . . . . . . . . . . . 0.37
Mechanical Q - Qms . . . . . . . . . . . . 8.0
Electrical Q - Qes . . . . . . . . . . . . . . 0.40
Equivalent Volume of Air - Vas . . . . . 169 L
Radiating Piston Area - Sd . . . . . . . . 765 cm 2
Electrical / Mechanical Parameters
Flux Density x Length - BL . . . . . . . . 18 Tesla-meters
Compliance - Cms . . . . . . . . . . . . . . 206 mm/N
Total Mass - Mms . . . . . . . . . . . . . . 314 grams
Impedance
Frequency Response (1W, 1m)
Maximum Excursion . . . . . . . . . . . . . 75 mm peak to peak
Xmax . . . . . . . . . . . . . . . . . . . . . . . . 38 mm peak to peak
Distortion (1W, 1m)

I purchased one last night, read a ton of reviews and have yet to find anything negative about them, these ar used in Wilson Audio cabs
Those will work very well in IB. Xmax is also a concern. You will want a lot of linear travel to get useable output.:verymad:

5 Or better is a rule of thumb but way off from necessity when doing IB. When placed in the vehicle the final system Q will raise dramatically.