Sub upgrade

by jazzbass
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I know, I know, I'm hardly the only one here to ask advice on upgrading subwoofers, so I'll make this as specific as possible. My interior speakers are a set of JBL components up front, with a set of JBL 6.5" three ways in the back. Both are GTO series, though the specific model number escapes me. Rated power handling on both sets is around 60 - 65w rms, sensitivity in the 90-91db range. They are being powered by a US Acoustics USB 4065, rated at 65w per channel rms which I believe is a more than honest rating.

Currently I am running an R/F punch Z 12" sub in a sealed box behind the seats (Sorry it is a regular cab pick up, although it does have a little more room than most). Rated RMS for the sub is 150w, being powered by a US Acoustics UP-200 bridged 160w rms into 4 ohms.

Gain matching the sub against the rest of the combination at moderate levels means that I run out of gas at high volume (starts to clip). I figure for a better balance all around for my tastes in listening an amp putting out an honest 300 w rms would do it. Plenty of good companies out there for amps, I'll figure that one out as I go along (I posted before and will probably go along with some of those suggestions). What I'm asking is: are there any suggestions for a good natural sounding 12" woofer that will work in a relatively small sealed box 1 - 1.5 cu ft. Bear in mind that, while I'd like to be able to purchase some high end stuff, my wallet has to think about putting kids through college. Basically I've looked at JBL, Infinity, Kicker, Memphis (don't know much about them) etc.


Replies (7)
pigwiggle on 01/25/2006 00:52:11
I have a similar system. Just installed an Infinity KP 10.1 (sealed 0.6 cf box) and have JBL p650c components up front. The components are rated at 90W, I’m giving them 110W( infinity amps). The sub is rated at 350W and I’m giving it 280W (the 12.1 is rated at 350W also).

Anyway, I have the same problem. When they comps and sub are matched the sub clips a bit soon. It’ll probably be able to keep up with the GTOs; depends on your taste for bass. Superb SQ though.


swez on 01/25/2006 11:22:23
If you stay with that amp, that will limit you to high efficiency subs and a ported box to get a few more dB of bass SPL.

The other option is more costly... jumping to a 300 - 600 Wrms amp and one strong sub that will ideally fit in your present enclosure.

What is the internal cf of your present sub enclosure?

Swez


jazzbass on 01/25/2006 18:50:12
The current enclosure is just over 1 cu ft. Building another one would be a matter of cheap money at H/D for 3/4"mdf and an excuse to use newly purchased power tools (X-mas presents), so that's no biggie.

I'm looking to go 300 or so real watts

compvr15s on 01/25/2006 20:19:12
http://www.sonicelectronix.com/item_2175.html

http://www.sonicelectronix.com/item_2584.html

alpine type s sub and alpine 350 watt mono amp... will sound very clean and still add alot of low end bass to ur setup. works best in .85 to 1.5cubic feet so if you want to build another box that would be fine... am sure you will find better prices on ebay but prolly without warrenty... also may want to look into jl audio w0 and w3 series... very clean subs and get with the program as well. good luck

jazzbass on 01/26/2006 23:44:55
Okay, I found a deal that might work. I can certainly build another box to handle 2 subs, and with proper placement, should be able to get it to fit.
http://www.crutchfield.com/S-IMoWsEBVUqw/cgi-bin/ProdView.asp?g=520&I=1081040W

Good deal for 2 of them, powered by this amp, bridged.
http://www.crutchfield.com/S-IMoWsEBVUqw/cgi-bin/ProdView.asp?g=120&I=698R7540A

Since Crutchfield is an authorized dealer, I have no reason to believe the amp would be a problem, and that's a heck of a price.

Q: Am I going to totally overpower the rest of the combination (see above)? I figure I'll just end up with a tremendous amount of dynamic headroom, and I can balance the gain settings a bit.

Next Q: Advantages/disadvantages to a 2x10 set up as opposed to a 1x12. I am assuming (as a rule) that the 10's (sealed) will be a little more punchy on say, bass guitar riffs, and a little more definition on kick drum, but but be less able to handle the extreme lows like low synth and electronic drums. This seems like a trade off I'd be willing to make.

Thoughts?

Tinker18 on 01/27/2006 15:19:11
to answer your second question, a 2x10 inch setup results in more punchy bass, very tight, crisp and clear. now, the higher you go up in size with subs, the more low end base you have, but bear in mind, the bigger the sub= A) more power required B) more distortion, and C) a bigger box. generally.

its a good trade off,as that is what i have, but you wont be able to tell too much of an spl difference between 2 10's or 1 12'.

when you buy an amp, try to get a mono channel amp., better efficiency and you wont have to bridge it to get the required amount of power out of it that you need. Alpine makes an amp for around $190-$230 that is a mono amp and puts out about 300w rms x1, depending on which subs you decide to get, they may work nicely with this amp.

best bang for the buck that i have seen in awhile.


tink

swez on 01/27/2006 17:35:26
The Alpine MRP-M650 would be a nice match for those Infinity Ref subs. It's class D, 600 watts Wrms @ 2 ohms and if you shop it hard, am sure you can get it for about $160.00.

I would also suggest a sealed enclosure for the Refs. Crutch states 0.75 cf as the target. You can go a tad larger for more deep bass if you like. (0.85 cf) But, you'll have to be aware of pushing these subs a bit too hard in deep bass tracks and larger sealed box as the cones may get a bit sloppy at high SPL levels.

Swez



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