I need a new amp!
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=27868
Printed Date: June 15, 2024 at 8:45 PM
Topic: I need a new amp!
Posted By: pioneer86
Subject: I need a new amp!
Date Posted: March 07, 2004 at 2:23 AM
Please help me anyone!!! I have two Premier 1041DVC's in a tuned ported box in the back of my Celica. Right now I'm running a Sound Storm 350.2 amp (which when I tested, it was running 93w RMS @ 4ohms). I'm looking for a little more power to those poor subs since they aren't getting anything right now. They handle 400w continuous each. I was thinking the Rockford Fosgate Punch 451s amp (which puts out a tested 460w RMS @ 4 ohms). Another option I found was the Punch 401s, but I can't find any sellers for it on the internet (only because I can't afford an amp here in town). However, even with my 93w RMS, I can bottom these subs out when I hit subsonic tones, like 25Hz and below. I was thinking of an FMOD 30hz High pass crossover to fix that, but I don't know if that's not too high to cut off at. Here's everything that I'm running....maybe this will help: - Pioneer DEH-1500 deck
- Kenwood 3.5" speakers in the dash (90w Max)
- Kenwood 6.5" 3way speakers in the back side panels (175w Max)
- 4 1" tweeters (unknown brand, but handle 300w Max)
- 2 Premier 1041DVC 10" subs (800w Max) in a tuned-ported box (slot style)
PLEASE HELP ME ANYONE!!!!
Replies:
Posted By: DYohn
Date Posted: March 07, 2004 at 9:36 AM
I may be wrong but I believe Pioneer specifies their subs are optimized for sealed enclosures, so it is possible you are causing the woofer to "bottom out" because it needs more enclosure dampening and not from overdriving them with amplifier power. What you are hearing is the woofer structure exceeding its XMAX linear excursion limit. Using more amplifier power on top of this will certainly only make matters worse. Are you running your system at 4 ohms or at 1 ohm? The info I can find is for the TS-W1040DVC and states it requires a 1.0 CUFT sealed system. The woofer is rated to 18Hz. Using a subsonic filter at 30Hz will really be noticeable as you won't "feel" the bass if you do that.
Posted By: pioneer86
Date Posted: March 07, 2004 at 4:21 PM
Yes, the woofers are recommended in a 1.0CUFT sealed system, but they just don't sound that good in a sealed box. The box I am currently using really makes these subs pound. I mean it hurts just to sit inside of my car, and that's with only 93w of power. I was told by a local dealer that if I put a subsonic filter @ 30Hz, then the subs will still pick it up, they will just start fading out at 30Hz. I think this may possibly be the way to go since they start bottoming out at 25Hz. They will still put it out, just not so loud. Oh, and I am running my system at 4ohms. The voice coils are wired in series, and the two subs are wired parallel at the amp and bridged to 4 ohms.
Posted By: Alpine Guy
Date Posted: March 07, 2004 at 4:33 PM
if you seal your box, and feed them 400w rms, then they will hit incredibly hard, and play everything with no worries, plus, everything will sound as it should.
Posted By: pioneer86
Date Posted: March 07, 2004 at 4:50 PM
Yes, but I know for a fact that sealed boxes do not go down to the lower frequencies that I want to be able to pick up. In a 1.0CUFT sealed box, these subs will only go down to about 60Hz successfully. I've already tried it, and they sounded horrible. Heres a pic of the current box, maybe this will help a little. These two tens are louder with 93w than systems with two 15's in a sealed box and running 800w RMS power. I know my box is a very good design, but I'm just worried about blowing them with the lower frequencies (25Hz and lower). The subsonic filters I'm looking at start at 30Hz and cut off 12db per octave. I'm pretty sure that should be sufficient enough. 
Posted By: Ketel22
Date Posted: March 07, 2004 at 5:11 PM
if your going to cut off the lower freqz with the subsonic filter, y not just change to a sealed enclosure anyways and save the money for the filter and have less chance of blowing your subs.
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Posted By: pioneer86
Date Posted: March 07, 2004 at 5:17 PM
I might not have made it clear before, but having those subs in a sealed enclosure sounds horrible. The stop putting out at about 60Hz. My current box stops putting out at about 30Hz, and they start to bottom out at 25Hz. I still need help in choosing an amp too. Please just forget about the box because I believe a subsonic filter will fix my problem with that. I need to know what kind of amp to get!!! Please help me.
Posted By: Ravendarat
Date Posted: March 07, 2004 at 6:16 PM
If they arent putting out below 60 hz than you have some other problems going on my friend. I have sold these subs before and can say for a fact that if you put them in a sealed box at about 1.25 cubic feet per sub and run a couple hundred watts at them they will pound all day and sound great while doing it. Pioneer always gives Ideal box specs that arent exactly ideal all the time. I run 4 304's and they call for 1.5 cubic feet ported and I run them in 2.2 cubic feet per sub off about 350 watts rms and they work perfectly fine.
Posted By: customsuburb
Date Posted: March 07, 2004 at 7:06 PM
Really if your subs don't go down to 60 hz in a sealed box then you must be running them in free air, or maybe its just because they're pioneer.... Really though my computer speaker system's sub with a 4" woofer can go lower then that. Make a quality sealed box and you should be happier. If you're looking for a quality inexpensive amp then try US Acoustics USB-2150. If you can spend a little more then try the Power 551S
Posted By: pioneer86
Date Posted: March 07, 2004 at 7:13 PM
They go lower than 60Hz, but they put out the loudest at 60Hz. They start to fade out after about 55Hz in a sealed box. I don't know, maybe its just my cheap amp that's making them sound horrible in a sealed box. But the box that I currently have pounds at around 45-30Hz.
Posted By: Alpine Guy
Date Posted: March 07, 2004 at 10:08 PM
all subs will go down from 60 hz, since 60 hz is around the average resonance frequencie for vehicles, it seems loudest around that point. Under 60 hz your ears stop picking up the tones as the sub plays lower and lower. Since your set on a ported box, maybe tune it different to handle the more power.
Posted By: pioneer86
Date Posted: March 08, 2004 at 6:27 PM
Alright, I think I'm set. I will take my box apart, seal it (the port will still be there, but it won't be used), and run the Punch 501s amp to it. Hopefully, that will all work out perfectly and my two 10's will go down to the lower frequencies that I want. Thanks for your help everyone. I don't know how this'll work because the amp puts out 500w RMS, and my subs only handle 400w RMS....but I guess I just won't turn the gains up as loud. Thanks alot.
Posted By: customsuburb
Date Posted: March 08, 2004 at 7:37 PM
FYI: each sub will be getting 250 watts. This should not be over their RMS limit so set the gain properly and you should be set.
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