YAMATOSOUL

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I've recently put a lot of work and money into my sound system. Most of the equipment (Alpine head unit, Boston separates up front, JL separates in back, two JL 10" subs, MTX 50Wx4 amp, MTX 125Wx2 amp) came out of my last car, so I decided to put the money into the foundation this time and had an installer do a full on Dynamat installation on my entire car, along with Tacmat along the firewall (17 rolls total of Dynamat, 4 rolls of Tacmat). The JL separates and subs(I forget the model# but according to the receipt, it's CVS210G-W3V2), I ended up buying to replace my old Boston 6.5" for the rear and the single Boston 10" sub. The result? In a word, the thing quakes!! But my installer tells me that I'm only giving the JL subs about 1/3 the power it's capable of handling, so they're not performing at their peak performance level. Now, this is the first time I've ever had such an elaborate system, and I do notice that the subs are a little slower than my single 10" used to be. But all new speakers need to be broken in and it's only been a few days. Can anyone tell me if I really do need to get more muscle behind the subs? For the subs, I'm running the MTX 125Wx2 bridged, which should put out more than 250W RMS - more like 280W-300W.

erty67

iTrader: (104)

What model JLs do you have? If they are W0s or W1s, you should have plenty of power. W3, W4, W6, and W7s could handle more.

YAMATOSOUL

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They're the newest, W3V2. Most people haven't even heard of them. The installer was telling me, they're like the old W6's.

erty67

iTrader: (104)

are they dual 2, 4, or 6ohm subs? Also, is that MTX amp 125x2 at 4 ohms?

YAMATOSOUL

iTrader: (1)

I believe they're dual 4ohms and the MTX's are 125x2 at 4ohm as well.

erty67

iTrader: (104)

I know i keep asking questions, but I'm thinking what you can do with what you have also. What's the model # of the mtx amp?

erty67

iTrader: (104)

i dug this up. it show you the optimal range for your sub. Being that you have the dual 4 ohm subs, you can set them up to be 2ohm or 8ohm each. Your best options would be to set up at 2ohms and use a 2 channel amp(2ohm stable amp), or set them up at 8ohm and use a mono amp. If your MTX amp is 125x2 at 4ohms, it could be like 250x2 at 2ohms(if stable at 2ohm). Optimal range for your subs is 300W each. If this is how they are setup, you are doing good. If they are set at 8ohms and your amp is 125x2, you are only getting about 75W each at 8ohms. Wiring can make you or break you. Let me know what model amp you have and i'll look up the specs. Also, do you know how the subs are wired up?

http://www.jlaudio.com/subwoofers/pdfs/12W3v2_MAN.pdf

YAMATOSOUL

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The model#is RT2200, and pretty sure my installer said they're set up at 4ohms. BTW, thanks for your help.

erty67

iTrader: (104)

RMS Power measured at 12.5 Volts DC:
50 Watts x 2 into a 4 Ohm load with less than .5% THD
100 Watts x 2 into a 2 Ohm load with less than 1% THD
200 Watts bridged into a 4 Ohm load with less than 1% THD

Dynamic Power (IHF-202 Standard) measured at 14.4 Volts DC:
85 Watts x 2 into a 4 Ohm load
140 Watts x 2 into a 2 Ohm load
280 Watts bridged into a 4 Ohm load

Signal to Noise Ratio:
100dB A-Weighted (Referenced to Rated PWR at 1VRMS Input Sensitivity)

Damping Factor: >200

Frequency Response: 20-20,000 Hz ±.25dB

Bass Boost: Variable Boost centered at 40Hz (0 to 18dB)
Defeatable 18 dB/octave crossover at 85 Hz, selectable for high pass, low pass, or full range.

Dimensions:
7" x 9" x 2" (17.8cm x 22.8cm x 5cm)

erty67

iTrader: (104)

100 Watts x 2 into a 2 Ohm load with less than 1% THD

This is mostly likely what you have going. Each sub has two 4ohm coils. If you parrallel them you have a 2ohm sub. multiply that by two and you have 100x2 running out of that amp. Minimum suggested power for that sub is 75W each and you are hitting it with 100W. You could do a more powerful amp and get a lot more BOOM out of those subs. An amp pushing 250x2 or 300x2 at 2ohms is your best bet.

YAMATOSOUL

iTrader: (1)

Hey thanks a lot for your help! Man, you really know your car stereo

erty67

iTrader: (104)

your welcome. I used to have a MTX pro752, which is compareable to your amp. I had it on my two 12" w0s and it struggled. I had the gain almost all the way up. I upgraded to a kenwood PS200T(excelon before excelon was a name) and it's been going for 5 years now. Also, the gain is only about 1/3 of the way up, so it's not straining the amp. Maybe that's why I've had it so long Good luck!

YAMATOSOUL

iTrader: (1)

Thanks. I'll let you know how it turns out.