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Old 12-21-2007, 03:18 PM   #1
wraith0078
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Sub/Amp help

Okay, now that I've gotten help with the headunit, front and rear speakers, I need to pick your guys' brains regarding subs and amps.

First off, the type of music I like to listen to ranges from classical to heavy metal. Not too big of a fan of hip-hop type music. I would rather have crisp clear sound than to be able to knock stuff off the walls in the house when I pull into the driveway. :)

Here is the head unit I've ordered: Kenwood Excelon KDC-X591

These will be the front and rear speakers: Pioneer TS-A6871R 6"x8" 3-way Speakers

The head unit already has front/rear high-pass filters and a low pass filter with separate adjustments for subs.

First off, would you suggest going with one or two subs, and what size?
These are what I have currently under consideration: MTX RT12X2A

Now the amplifier is the big point of confusion here. I'm assuming that since those have a single input on them, I'll want a mono amp with an output of 200-800w RMS at 4 ohms. So, am I even in the right ballpark? Would these be overkill for the type of listening I do?

Or do you think the following would be more in line for what I'm after?
Two Thunder4500 10" subwoofers
Bass Slammer Type 2 sealed dual 10" enclosure


Now, with all of this, would I need a cap, or are they generally for higher-end systems than I'm thinking of putting together?


(I'm just full of questions, ain't I?)


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Old 12-21-2007, 04:19 PM   #2
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questions are good and this is the place to ask them.. thats how i got my system picked out...

if your not into brain rattling bass i would suggest 1 10 for you... not to boomy and it has a good response time... Wattage is up to you really i would suggest something in the 400 -500 watt range...

As for you amp its really depends on your sub if you get a 2 ohm speaker you will need an amp that will push the RMS of the sub at 2 ohms for example if you buy 1 10" sub that has 500 watts RMS at 2 ohms you will need a block that will push 500 Watts at 2 ohms..

No you dont need a cap for a single amp.. Its wasting money i would do the big three and you will be fine..
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Old 12-21-2007, 04:34 PM   #3
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my suggestion would to go with two Kenwood KFC-W3011's....excellent 12 inch sub that sound very good....Match it up with a KAC-8103d or if you want to run more power get a KAC-9103d amp. Also I would recommend that you put these subs in a sealed box that is approx 1.25 cubic feet per chamber.
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Old 12-21-2007, 06:22 PM   #4
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What does the volume of the chamber do for the sound? I.E.: If I were to increase/decrease the size of the box, how would that change the way the subs sound?
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Old 12-21-2007, 07:11 PM   #5
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you will NOT want 2 12's for SQ (sound quality), that setup would be better for SPL (sound pressure level) and a waste of money for what you want out of it.

Generally, here is the order of choosing things, and my though processes for choosing what I did.

how to choose a sub-woofer:

1. decide how big of an enclosure / box you want to use. In my case, this was as small as possible. So I was limited to about a .5-.7 cubic foot box. For you this may or may not be more.

2. Ported vs. Sealed vs. bandpass. You will want a sealed box for SQ and classical and rock music.
http://www.crutchfield.com/learningc...nclosures.html

3. Based on your box size, you can start looking at subs. This is a good time to decide wether you want 1 10, 1 12, 2 10's, 2 12's, etc... Generally for a modest system on a budget 1 10" will be FINE in a hatchback, but go to 1 12 if you like it reeeeally deep. People will try to tell you different, but they are probably "bassheads" and SPL guys. So since I decided on 1 10 with as small enclosure as possible, I was stuck into shallow mounts. You dont necessarily have to go that route.

4. power. 300wrms is plenty. 500wrms is really gonna knock your socks off. its important to look at rms ratings, not max ratings.

5. post up here with your goals for power and sub size and box size, and people will start recommending a sub. For 1 10" in a .7-1.2 cubic foot box SQ application, you should look into the Rockford-Fosgate P310d4, Image Dynamics IDQ10, Boston Acoustic Pro (dunno model number), and a couple others I cant recall.

6. Make a list, then search caraudio.com's forum to get some feedback on the subs you picked.

7. post up here again with your "is this retarded" post that we all know and love

8. now you can start to choose an amp (see next post)
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Old 12-21-2007, 07:16 PM   #6
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how to choose an amp:

1. Figure out the load the amp will see using R-F's woofer wiring wizard.
http://www.rockfordfosgate.com/rftech/woofer_wizard.asp

2. figure out the rms wattage of your combined subs (or just 1). For you it should be around 300. In my case, I will have 1 4 ohm dvc sub, wired in parallel for 2 ohms.

3. start looking for amps that have 20-30% MORE than that power available. So for a 300wrms sub, you should get AT LEAST a 350wrms amp at whatever load it will see. So in my case, I want one that puts out AT LEAST 350wrms at 2 ohms.

4. stay away from cheap brands. Pyle, Profile, Hifonics to name a few.

5. Post up here with your choice.

6. be happy
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Old 12-21-2007, 07:20 PM   #7
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For a 300wrms system, you shouldnt need a cap. Just maybe do the big 3.

Keep your gains off the max... Search google for a gain setting tutorial and USE A TEST TONE if its your first time setting gains.

Try to use the box that the manufacturer recommends. Any bigger and it will sound boomy, any smaller and it will not give a full nor flat response.
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Old 12-21-2007, 07:40 PM   #8
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all excellent info that was stated above.....i think though with a 4 channel amp to help with balance that a 2 12 inch setup can be the best of both worlds with plenty of "thump" but still keeping the sound tight
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Old 12-21-2007, 07:53 PM   #9
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more of a KA-FREAKING-BOOOOOOOM than a "thump"

lol
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Old 12-21-2007, 09:37 PM   #10
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Man i've got 1 12" in the back of my car and my freakin hair vibrates with the music... 2 12's are absolutley insane yet very appealing.... But if you have 2 12" you will also need the components up front with a big set of cahones or else all you will is bass... its realy all about balance and determing your needs bigger isnt allways better and a few good speakers will always beat out alot of shitty ones
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