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/CarAudio/p_23629_Rockford_Fosgate_R300-10.aspx
Price $29.95ea
Steve @ Apex Jr.
steve.apexjr@prodigy.net
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/CarAudio/p_23629_Rockford_Fosgate_R300-10.aspx
Price $29.95ea
Steve @ Apex Jr.
steve.apexjr@prodigy.net
Last edited:
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
GM
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.
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.
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
GM
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
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
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.
The Smith & Larson Woofer Tester II is a little nicer/more accurate, but to be honest, either should work.
Ooooh. The amplifier may be designed to drive very low impedance loads so it doesn't have to have a switching power supply. 0.36 ohms is probably correct; Kicker (Stillwater Designs) had a similar subwoofer system in the mid 1990's with a 0.5 ohm 10" driver.
I hope I'm wrong, but I'll bet I'm not. 😱
Last edited:
- Status
- Not open for further replies.