Leaderboard

Honesty is better than saving money anyday!

1. No, an AGM battery can withstand vibrations and such, I had my Xstatic Batcap 800 on my box for 2 years and no problems. 2. Hell yeah a 1500 will be too much for a 8" sub since they are only recommended to do 400rms (common sense), unless all your doing is burping the speaker. For daily that is ridiculous but it also depends if you have a D1 or D2 ohm subwoofer. 3. Yes a second battery is needed if everything in your car is stock.

Look at the subs on the ssa store : I don't think you can go wrong with any of them. And they're not the most expensive!! I like the fact that you can talk to the owners of the different brands here. You will have all the info you need. Good luck

RD Audio buisness practice = FAIL!

1) You should set the subsonic such that your excursion is realistic for your sub. Rule of thumb's IMO are not the way to do it. A quick model in Win ISD will show you the excursion for your power and box size. 2) You can measure. Filter frequencies are -3dB points so you could play a 10v sine wave and measure on a voltmeter, keep reducing the frequency until you hit 7.07V and that will be your crossover frequency or 3dB down point. I'd recommend burning a CD with a whole range of sine tones around your frequency of interest and use them. Of course you could use a single one if you know specifically what frequency you want it to be at. For instance, if that were 30Hz burn a 30Hz sine tone on a CD. Play the CD through your system with the filters off and measure the voltage. Now multiply that voltage by .7079. Now turn on your filter and turn the knobs until your DMM reads whatever voltage you just calculated.

Efficiency is more a factor. If you go very large, power handling will fall off, but if you stay close to suggested that is not an issue. Also, don't really need to worry about standing waves in a sealed box that I know of. I would not build to account for poly-fill. I get the idea you have this impression that if the air space a little larger that the sound is not going to be crisp and clean, that is also not an issue when the Xcon is in a proper enclosure of suggested size.

Dildo

In my personal opinion I think you should go with another brand such as sundown. Through my experience with the older rockford fosgate amplifiers (I owned a t40001bd and a t8004), they are very very power hungry. My 4kw amp had a fuse rating of 500A and only one battery and ground terminal! This shows the companies lack of engineering knowledge (0 gauge has a normal fuse rating of 300A to protect the wire). They are also very inefficient. Being a class BD amplifier the efficiency was only like 74% on the birth sheet. For a sub amplifier you will not notice the difference in quality from a class bd to a class d amplifier. You will however notice the lack of output when your voltage drops from the bd! Look into a class d amplifier for your subs. Never mind the marketing gimmick of a class "bd".

For 2 L7 15" you can use 2000 watts. What are your voice coils config ? DVC2 or DVC4 ? You must know that before getting any amplifier. All the amps listed make their "maximum" power at 1 Ohm.

can anyone just grow a pair and answer my question without saying "its all in the install"? cuz i mean you could say that to literaly any situation. you could put a ported 18 in like a 1 cubic foot ported box and it probably wouldnt be as loud as a 12 in a 5 cubic foot box. im not gonna hold anyone to their answer. my friend just asked me which would be louder, so i figured id post something up on here and ask some more experienced people. someone just give me their best estimated answer. it doesnt matter if your wrong. just give me your best opinion.