ONLY 143Db's? 3 JL Audio 15" W6 subs in a TRANS AM! What can be wrong..EXPERTS HELP!!
#1
ONLY 143Db's? 3 JL Audio 15" W6 subs in a TRANS AM! What can be wrong..EXPERTS HELP!!
I have a 2000 Trans AM with IVA-C800 head unit, boston pro series components in the front and rear and a JL Audio 300/2 going to each pair. I also have a JL Audio 1000/1 Amp running in mono to 3 JL Audio 15" W6 subwoofers. 0 guage wiring, extra battery and 3 caps. Why am I only hitting 143Db's? I have 1.92 cubic feet going to each subwoofer...and I found out they call for 1.00-1.50 cubic feet per speaker...would the extra .4 cubic feet make this big of a difference and make me lose that much DB? Can someone please help?? I had 3 12" W6 subs in my old 96 camaro and it hit 144Db's with half the size amp and 3 smaller subs. Please someone help, I need the input!!
#4
Originally posted by themushine
The Microphone was hung from the rear view mirror...
The Microphone was hung from the rear view mirror...
secondly.........this years dbdrag official mics are about 6-7db lower than last years............and other mics that other sancioning bodies use are all different..........you can score a 150 on one mic, then a 145 on another.
#5
Originally posted by themushine
would the extra .4 cubic feet make this big of a difference and make me lose that much DB?
would the extra .4 cubic feet make this big of a difference and make me lose that much DB?
#6
Three 12s should hit more than 144, let alone three 15s. Maybe it is the mic, but sounds low to me. How does the output compare audibly? Do the 15s sound louder to your ear than the 12s did? I wonder if it isn't something else...
#8
Originally posted by firebirdude
Did you make the box yourself? Did you have a shop do it? Sure the box isin't leaking? Are you REALLY sure? That is a really low score..... I do 145's with three 10"s!
Did you make the box yourself? Did you have a shop do it? Sure the box isin't leaking? Are you REALLY sure? That is a really low score..... I do 145's with three 10"s!
#12
Are you running sealed or ported enclosure(s) for the subs?
If you're ported, what's the tuning frequency and what's the peak frequency for the box?
Placement will have an effect on output as well, however in our cars the hatch tends to minimize this effect.
What type of meter were you measured on?
For example: I meter out at 147.8 on USACIs recalibrated AudioControl meters, when tuned to 35Hz (Peaking around 40), but I metered at 143.5 on MECA's Linear-X recently with the same setup tuned to 45 Hz (Peaking around 50). The weather was cooler at the USACI show (it was in April) and the MECA show was just last month it was HOT and HUMID (rained half the day). With my last setup (sealed enclosure) I metered at 141.0 on the Linear-X and 142.9 on the recalibrated AudioControl. Very similar weather.
If you're ported, what's the tuning frequency and what's the peak frequency for the box?
Placement will have an effect on output as well, however in our cars the hatch tends to minimize this effect.
What type of meter were you measured on?
For example: I meter out at 147.8 on USACIs recalibrated AudioControl meters, when tuned to 35Hz (Peaking around 40), but I metered at 143.5 on MECA's Linear-X recently with the same setup tuned to 45 Hz (Peaking around 50). The weather was cooler at the USACI show (it was in April) and the MECA show was just last month it was HOT and HUMID (rained half the day). With my last setup (sealed enclosure) I metered at 141.0 on the Linear-X and 142.9 on the recalibrated AudioControl. Very similar weather.
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