Live Chat!
SVX or Subaru Links
Old Lockers
Photo Post
How-To Documents
Message Archive
SVX Shop Search
|
SVX Network Forums Live Chat! SVX or Subaru Links Old Lockers Photo Post How-To Documents Message Archive SVX Shop Search |
IRC users: |
|
|
|
#1
09-03-2005, 11:15 AM
|
||||
|
||||
|
Subwoofer/ Amp question
I got a pair of 12" woofers and an amp from my brother a few weeks ago.
speakers - http://www.soundcity.com/products/15166.html?tr=froogle they are 200watt rms/ 400 peak @ 4 ohms punch XLC RFP2412  amp - rockford fosgate punch 250a2   I am running them from a JVC cd player with preamp outputs. this one -- http://www.jr.com/JRProductPage.process?Product=4048728 I have it all wired with monster cable and monster oxygen free speaker wire and very large monster power and ground wires with the power lead up to the battery. (I didn't shell out for the monster cable, my brother gave me his  )It is in a box in the trunk right now facing up I have it wired in stereo - one speaker per channel and it just doesn't hit very hard. I am sure the speakers are in phase. This is how I hooked it up  I tried wiring it bridged in mono and the amp would heat up and shut off. It hit pretty hard though. I had it hooked up like this (only with 2 leads on each so I could run both speakers)  Am I doing something wrong or is this amp just too small for the speakers? Also I am not too smart on the 2 ohm 4 ohm thing. If I have it wired in stereo that makes it 2 ohms, right? So is that bad for my 4 ohm speakers? It sounds better and feels better if I leave the back seat folded down but I don't want to ride around like that all the time. There are settings for gain and crossover range on the amp and I've played with them along with the equalizer on the stereo but I can't get it to hit very hard without distorting. Thanks in advance for any ideas. I am an amp and subwoofer n00b.
__________________
Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. Last edited by immortal_suby; 09-03-2005 at 11:18 AM. 
|
|
#2
09-03-2005, 11:29 AM
|
||||
|
||||
|
250 watt peak amp is weak in the first place and those subs can't handle much more. Also the box they are in can make a huge difference. For refference I used a 17 inch 3/4" Triangle box in my old integra with 200 watt amp it hit as hard as my 500 watt amp comined with the newer Qlogic boxes. Don't for get that your also trying to go through the trunkn and all of its stuffing.
__________________
86 GMC Jimmy Blue and Silver- R.I.P. 87 Integra RS ~228k miles R.I.P.  92 SVX LS-L Perly ~186k R.I.P. 89 240sx se red ~165k miles Gone and unknown 89 240sx se Black~185k R.I.P. 85 Toyota pickup ~205k R.I.P. 85 BMW 325e ~ Gone and unknown 85 Ford Mustang getting engine swap now! 05 Colorado ~108k Daily Driver
|
|
#3
09-03-2005, 12:18 PM
|
||||
|
||||
|
i would keep it in mono and lower the gain. wire the speakers in a parrallel not series, and get a beter box. also, face the speakers to the rear of the car not up.
|
|
#4
09-03-2005, 12:39 PM
|
||||
|
||||
|
The box is 6"x14"x30" about 3/4" thick fiberboard. I guess that makes it about half the volume I need for these speakers.
 Why point them to the back? Don't I want them pointed towards the front? I also just figured out I had the +/- mixed up from speakers to amp. Both were the same, but - on amp to + on speaker. Wires weren't labeled so I unscrewed the speakers to check inside the box. It seems to be better already after fixing it but I don't understand why - I thought it didn't matter as long as the 2 speakers were in phase.
__________________
Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P. Last edited by immortal_suby; 09-03-2005 at 12:46 PM.
|
|
#5
09-03-2005, 12:42 PM
|
||||
|
||||
|
Quote:
__________________
Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P.
|
|
#6
09-03-2005, 12:57 PM
|
||||
|
||||
|
yeah, thats mono parrallel.
point the box to the back cause the sound to reverb off the trunk. low freq require air space to be herd/felt, pointing them to the back increases the amount of air the waves pass through before hiting your ears. trust me, turn them around and their will be a thump.
|
|
#7
09-03-2005, 01:35 PM
|
||||
|
||||
|
Quote:
 Fear Factory never sounded so good. I'll try the mono wiring and also only one speaker next to see if it gets even better.
__________________
Matt Locker Link 2015 BRZ Limited 6MT 92 Ebony LS-L ECUtune Stage2av1, Z32 MAF, 370cc injectors, TomsSVX intake, BontragerWorks 22mm RSB #003, HID Hi and Lo beams, OT endlink and bushing mods, PWR Aluminum radiator, Harvey's QC shift kit, 2.5" flowmaster 80 exhaust, 17" Michelin Pilot Sport A/S, Poly sway bar bushings, Slotted Bradi rotors, AFBeefcake powdercoated calipers, 97 grill, and a huge set of air horns. 300,000 miles and counting 92 Ebony LS-L. ecutune stage1v4, motorsport 1pc pulley. Garage Queen - sold to Dad in upstate NY 155,000 miles 19 Subaru Ascent Premium - -Hers !. 89 DL 4x4 little red wagon - a.k.a. The immortal suby. 275k R.I.P.
|
|
#8
09-03-2005, 01:27 PM
|
||||
|
||||
|
With two 4ohm speakers, you can only run these combinations:
Two channels at 4ohms each Mono at 8ohms (speakers in series) Mono at 2ohms (speakers in parallel) Mono in parallel (as you've drawn out) will give you the most thump, but it'll also load your amp pretty heavily and might let the magic smoke out. I don't think your amp is rated for that. If you had two 8ohm speakers, you could run in mono at 4ohms in series. That would be best. Unfortunately your best bet is stereo at 4ohms each, which only gives you 100 watts per speaker. That's 200 watts total - not very much. If you ran one speaker bridged, you'd be running at 320 watts - still not very much. Usually, two speakers at 100 watts each will outperform one speaker at 200 watts. Sometimes they won't, and sometimes two 75 watt speakers will outperform one 250 watt speaker. It varies. I'd suggest trying the one speaker, 320 watt option, just to see what difference it makes. I'm pretty sure I got the math right on all that. Double check your equipment's specifications against reality. Good thinkin' including the spec sheets. It helps when we know what you're talking about. Last edited by UberRoo; 09-03-2005 at 01:43 PM.
|
 |
|
|
Hybrid Mode
