Subwoofer question

[aldive]

With the MTX powered subwoofer that >>Built-in Crossover: The crossover frequency can be varied from 50Hz to 150Hz for a seamless transition between the output of this unit and that of the other speakers in the vehicle.<<.

How does one know how to make this adjustment. Any help greatly appreciated.

Thanks....

 

[MSTNGGUY88]

I only adjust my crossover for my 15's anywhere from 50-80 anything more than that let's too much voive come threw the woofers.IMO.

 

[leenjen]

with a 10" sub like the one in the thunderform, you should have the crossover set between 80-100HZ. too many high frequencies can take away from the lows and eventually damage the woofer.

i usually set most 10's aroung 90HZ. 12's & 15's i usually set at 80 or less.

 

[Brian's98XLT]

High frequencies will not damage your subs. The problem with setting the crossover to high is that it can drag your soundstage toward the back of the car. I normally adjust it to a point were I can not tell the bass is coming from.

 

[MSTNGGUY88]

Actually you can burn a voice coil by having too much high through a woofer. Ask your audio shop about that one. Trust me I know.

 

[Brian's98XLT]

I have been doing this professionally for over 10 years and I have never seen a subs voice coil burn up from a crossover set to high on a sub. A subs voice coil design is basically the same as a tweeters voice coil design other than the size of it.

 

[MSTNGGUY88]

I'm telling ya. Turn one on a Punch 10 up to around 125 and play something will some real highs in it and smell it cook. That is why I went with the 15's because they have a larger voive coil. Maybe it was just a problem with the Punch woofer.

 

[Brian's98XLT]

I carry Rockford at work and have never had a problem. It sound more like you were driving the sub to hard. What type of amp were you using and which series 10" sub. Was the box proper for the subs.

 

[MSTNGGUY88]

I was pushing them with a MTX THunder 500 and 1.5 cubic feet box with a divider in the box. I really didn't push them hard at all. They were the regular HE2's. My 15's are HE2's with the same amp in a 2 ohm load and a 5 cybic foot box with a divider and I love them but I think I wish I would have went with 12's.

 

[MSTNGGUY88]

Oh well Brian you seem to know alot about this o with what I told you I have is hitting a 144 good or bad?

 

[Brian's98XLT]

was that 1.5 per sub or was the total volume or was it .75 per sub

 

[MSTNGGUY88]

On the 10's I had .75 per sub and on the 15's I have 2.5 per sub.

 

[TerraBomb]

aaarghhh this is the same darn thing as the guy told me at the shop when he said underpowering an sub will blow it....no it won't , cause it won't A) generate as much heat on the coil b) it won't move much....with both these elements combined it won't damage the driver....too much power will turn them to black dust however....

there was an webpage about this that i have seen i just can't remember where it was anymore...

 

[MSTNGGUY88]

Underpowering can cause distortion though that can be damaging.

 

[nosaj122081]

Originally posted by MSTNGGUY88
Underpowering can cause distortion though that can be damaging.

Correct... Mostly b/c when you underpower speakers, you have the tendancy to crank it past the distortion limits of your setup trying to get more volume, and toast your VC's.

I've always fed my subs with more RMS power than they've been rated for and NEVER blown a single one. My 2 most recent were IDQ's and DEI Comps, the IDQ's were 12's and got about 350-400 (rated at something like 250-300) and the DEI's are 10s and get 450-500 watts (rated at 300 RMS).

 

[leenjen]

this has been discussed and debated many times in here already on a few threads. i dont feel like getting into it again. bottom line: underpowering a modern subwoofer will not damage the voice coil or blow the sub. sorry, but it just wont happen. maybe years ago it could happen, but you wont do it today. that's all i have to say about this.

 

[nosaj122081]

I agree that CLEAN, low power does no damage, I wasn't saying it would (as long as crossover points are set right), but I think the reason that the arguement still rages is b/c people buy a cheap-ass, too small amp, crank up the gains and push the headunit to its max, run no crossover, feeding a full meal of distortion to the subs, then blame it on "I was running too little power". And thats why people will continue to think too little power frys VC's.

 

[MSTNGGUY88]

Yep that's exactly what i meant by saying distortion does it. Sorry for the miscommunications there.