F/S Rockford Fosgate 10" Subwoofer - diyAudio
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Old 24th September 2010, 07:46 PM   #1
Apex Jr is offline Apex Jr  United States
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Default F/S Rockford Fosgate 10" Subwoofer

I just picked up a good quantity of a 300W RMS - 4 Ohm - 10"
Freq response 24-250Hz for sealed enclosure subwoofers
These are just the speakers that fit in the R300-10 enclosures
These are new surplus.
http://www.onlinecarstereo.com/CarAu...e_R300-10.aspx

Price $29.95ea


Steve @ Apex Jr.
steve.apexjr@prodigy.net

Last edited by Apex Jr; 24th September 2010 at 07:49 PM.
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Old 24th September 2010, 10:52 PM   #2
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Quote:
Originally Posted by Apex Jr View Post
I just picked up a good quantity of a 300W RMS - 4 Ohm - 10"
Freq response 24-250Hz for sealed enclosure subwoofers
These are just the speakers that fit in the R300-10 enclosures
These are new surplus.
Rockford Fosgate R300-10 Powered Subwoofers - Car Subwoofers at Onlinecarstereo.com

Price $29.95ea


Steve @ Apex Jr.
steve.apexjr@prodigy.net
TTIUWP :-)
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Old 25th September 2010, 01:26 AM   #3
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Old 25th September 2010, 04:30 AM   #4
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Are the T/S parameters available?
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Old 25th September 2010, 04:52 AM   #5
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Hmm, according to the owner's manual, driver Fs = 36 Hz, Re = 0.36 ohms, so is this a misprint or a custom driver with little/no practical DIY usefulness?

GM
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Old 25th September 2010, 05:02 AM   #6
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Or is it this driver?

GM
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Old 25th September 2010, 07:24 PM   #7
Apex Jr is offline Apex Jr  United States
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GM...
Very good question....

I'm going to have to find someone locally to check these out
The part is marked 0003594541-21 and nothing else.

Does anybody know someone who can check these besides
Speaker City.

Steve @ Apex Jr.
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Old 26th September 2010, 08:13 PM   #8
GM is offline GM  United States
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Considering the business you're in, I'm surprised you don't have a woofer tester or similar. Anyway, I emailed them about this, though after I sent it, I noticed a tidbit in the manual about the drivers being 'application specific/optimized', so might want to measure 'Re' to see if it's really a fractional ohm one.

GM
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Old 27th September 2010, 03:48 PM   #9
Apex Jr is offline Apex Jr  United States
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GM...
Guess your right, should step up to the plate and buy a woofer tester
since I get offered drivers all the time.
Is the Parts Express WTF 3 the best choice ?

Hope I didn't make a major mistake, bought 300 of the Rockford Fosgate
drivers(big investment)
Also if they answer please post there response.

Steve
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Old 27th September 2010, 03:59 PM   #10
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Quote:
Originally Posted by Apex Jr View Post
Is the Parts Express WTF 3 the best choice ?
For your purposes, yes. Takes a few seconds to test a driver. I suggest just taking a few drivers out, running a low frequency signal through them for a few minutes that's high enough to get significant excursion, let them cool down a bit, then use the WT3 to measure their t/s parameters (Qts, Qes, Qms, Fs, Re).

You'll need a test box to measure Vas (I recommend the test volume method, not the added-mass method).

The WT3 will not be able to measure Xmax.
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