High efficiency subwoofer

hawkeyefile · 6th August 2008, 01:36 PM

Hi all, I need to know where I can buy or at least some names of high efficiency (high sensitivity, above 98dB) woofers for my car. Anything in between 10 and 15 inches. Frequency responce should be as low as 29 at least. I would also Like to know why most car audio subwoofers are crap (87dB, WTF are you thinking boss?) The best I could find where gw-15xp at 100 dB's.

sreten · 6th August 2008, 02:57 PM

Hi,

Basic physics.
Higher efficiency means less bass or a bigger box.
98dB down to 30Hz needs a massive box.

All that matters for subwoofers is basically volume displacement,
Sd x excursion and having the power to use it.
Any response can be EQ'd within excursion and power limits.

FWIW 87dB / 4 ohms = 84dB / real watt.

/sreten.

badman · 6th August 2008, 03:22 PM

Don't trust car audio specs mate. High efficiency subs are great, but take more real estate than most cars have available, every 3dB more sensitivity means a doubling of box size for the same bass extension.

Eva · 6th August 2008, 03:25 PM

Example:

Getting 102dB/W outdoors at 40Hz with a single 15 inch driver requires a 550 liter enclosure (folded horn).

Thighs are easier inside cars because cabin gain bosts efficiency by 12dB/oct below 60Hz and down to 20Hz or so. You can expect another 6dB or so of boost below 200Hz due to the inherent 0.5 pi spatial load.

I recommend 6th order bandpass boxes as they may be tuned to increase efficiency while equalizing cabin gain and keeping cone displacement under control. They allow some low efficiency drivers to sound loud with not that much power.

hawkeyefile · 6th August 2008, 08:22 PM

Thanks, I have a GW-15XP on my hands with a 100dB sensitivity and It moves a ton of air with little power.

AndrewT · 8th August 2008, 11:32 AM

Quote:

Originally posted by hawkeyefile
It moves a ton of air with little power.

is this exaggeration typical of Car Audio enthusiasts?

hawkeyefile · 8th August 2008, 06:44 PM

no, it moves 185 liters of air. and it only needs 60 watts to rattle the crap ou of the car.

AndrewT · 8th August 2008, 06:50 PM

Quote:

Originally posted by hawkeyefile
no, it moves 185 liters of air. and it only needs 60 watts to rattle the crap ou of the car.

about 220gms= 1caraudio ton
and we flush our excrement down the loo.

hawkeyefile · 8th August 2008, 06:58 PM

Quote:

Originally posted by AndrewT

about 220gms= 1caraudio ton
and we flush our excrement down the loo.

lol, I was talking figuratively. It just moves a lot of air with little power.

Brett · 8th August 2008, 07:01 PM

Quote:

Originally posted by hawkeyefile
no, it moves 185 liters of air. and it only needs 60 watts to rattle the crap ou of the car.

185 litres? Really. Then it would need an excursion of 2.23 metres (for a 15" driver with an Sd of 830cm)

6th August 2008, 01:36 PM	#1
hawkeyefile diyAudio Member Join Date: May 2008	High efficiency subwoofer Hi all, I need to know where I can buy or at least some names of high efficiency (high sensitivity, above 98dB) woofers for my car. Anything in between 10 and 15 inches. Frequency responce should be as low as 29 at least. I would also Like to know why most car audio subwoofers are crap (87dB, WTF are you thinking boss?) The best I could find where gw-15xp at 100 dB's.

6th August 2008, 03:22 PM	#3
badman Custom Title diyAudio Member Join Date: Sep 2003 Location: Sunny Tustin, SoCal	use dem eyes son! Don't trust car audio specs mate. High efficiency subs are great, but take more real estate than most cars have available, every 3dB more sensitivity means a doubling of box size for the same bass extension. __________________ I write for www.enjoythemusic.com in the DIY section. You may find yourself getting a preview of a project in-progress. Be warned!

6th August 2008, 03:25 PM	#4
Eva diyAudio Member Join Date: Oct 2003 Location: Near the sea	Example: Getting 102dB/W outdoors at 40Hz with a single 15 inch driver requires a 550 liter enclosure (folded horn). Thighs are easier inside cars because cabin gain bosts efficiency by 12dB/oct below 60Hz and down to 20Hz or so. You can expect another 6dB or so of boost below 200Hz due to the inherent 0.5 pi spatial load. I recommend 6th order bandpass boxes as they may be tuned to increase efficiency while equalizing cabin gain and keeping cone displacement under control. They allow some low efficiency drivers to sound loud with not that much power. __________________ I use to feel like the small child in The Emperor's New Clothes tale

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6th August 2008, 02:57 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, Basic physics. Higher efficiency means less bass or a bigger box. 98dB down to 30Hz needs a massive box. All that matters for subwoofers is basically volume displacement, Sd x excursion and having the power to use it. Any response can be EQ'd within excursion and power limits. FWIW 87dB / 4 ohms = 84dB / real watt. /sreten.

6th August 2008, 08:22 PM	#5
hawkeyefile diyAudio Member Join Date: May 2008	Thanks, I have a GW-15XP on my hands with a 100dB sensitivity and It moves a ton of air with little power.

8th August 2008, 06:44 PM	#7
hawkeyefile diyAudio Member Join Date: May 2008	no, it moves 185 liters of air. and it only needs 60 watts to rattle the crap ou of the car.

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