is this amp good enough?
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=106304
Printed Date: April 16, 2024 at 4:21 AM
Topic: is this amp good enough?
Posted By: 03F150Fx4
Subject: is this amp good enough?
Date Posted: July 22, 2008 at 8:16 PM
I'm about to install a system into my '06 Explorer. I have a Kenwood KAC-7521 800Watt peak amplifier https://www.crutchfield.com/S-dqzm0LKNPnU/App/Product/Item/Main.aspx?i=113KAC7251&search=kac-7251 Now I had 2 12" pioneer subwoofers that were in my old truck, but they are no good any more, and weren't loud enought (only 150 rms). I'm thinking about getting one of these https://www.pioneerelectronics.com/PUSA/Products/CarAudioVideo/Subwoofers/Champion/TS-W307D2%7CD4 Its 1,200 watts Max , and 400 RMS. My question is which sub should I get the 2 ohm version or the 4 ohm version? I think when the amp is bridiged it runs at 460 watt rms x 1 at 4 ohms. I have no idea what 2 and 4 ohm means, Will it be louder with a 4 ohm sub? Thanks in advanced
Replies:
Posted By: 03F150Fx4
Date Posted: July 22, 2008 at 8:18 PM
also I'm thinking about using a ported box rather than a sealed box. Will a ported box be louder?
Posted By: advanced_audio
Date Posted: July 22, 2008 at 9:43 PM
https://www.the12volt.com/caraudio/woofer_configurations.asp?Q=2&I=42
2 4ohm subwoofers and bridge the amp wire them in series/parallel just like in the link and a ported box would have more output
Posted By: 03F150Fx4
Date Posted: July 22, 2008 at 10:44 PM
I plan on adding just 1 subwoofer. So 1 4ohm subwoofer should be good right? As for the box, the sub calls for a 1.25cu ft enclouser with a 3"dia x 7.5" port. Or a .86 cu ft sealed box. Which would sound better and louder?
Posted By: dragon51
Date Posted: July 22, 2008 at 10:51 PM
You will want to get the dule 2 ohm speaker if your only going to run 1 sub. Then you will want to hook it up in series and you will then get a reading of 4 ohms. when bridged on that amp. With that you will be able to take full advantage of your setup. As far as the box really depends what your wanting to do. Also are you building the box yourself? A ported box is harder to build then a sealed box.
Posted By: 03F150Fx4
Date Posted: July 22, 2008 at 10:55 PM
dragon51 wrote:
You will want to get the dule 2 ohm speaker if your only going to run 1 sub. Then you will want to hook it up in series and you will then get a reading of 4 ohms. when bridged on that amp. With that you will be able to take full advantage of your setup.
K one question though what does hooking it up in series mean? Sorry for all the questions I just want to do this right the first time around. Now later on down the road can I always add another sub if I want to?
Posted By: dragon51
Date Posted: July 22, 2008 at 11:10 PM
I know there is a diagrahm (SP) I will see if I can find it. It how you hook up the voice coils.
Posted By: dragon51
Date Posted: July 22, 2008 at 11:15 PM
Here ya go I was not able to find post I also did not look too hard. But here ya go I used google. Check this out it tell you how to do it. https://www./help/Articles.cfm?id=68
Posted By: 03F150Fx4
Date Posted: July 22, 2008 at 11:35 PM
I was looking on the site and found this diagram. I figured that I would wire it up like the 2nd diagram for a 4ohm load, since my amp is 460 watt x 1 bridged at 4ohm https://www.the12volt.com/caraudio/woofer_configurations.asp?Q=1&I=22 is this correct?
Posted By: dragon51
Date Posted: July 23, 2008 at 4:42 PM
Thats correct! Like I was explained in my other post and it's the perfect load for the amp and it's not over working your amp. Then just read the sticky on how to set the gain and leave it.
Posted By: 03F150Fx4
Date Posted: July 23, 2008 at 11:22 PM
dragon51 wrote:
Thats correct! Like I was explained in my other post and it's the perfect load for the amp and it's not over working your amp. Then just read the sticky on how to set the gain and leave it.
awesome, thanks for you help I really apperciate it.
Posted By: aznboi3644
Date Posted: July 24, 2008 at 1:36 AM
The factory recommended ported enclosure will sound like crap and have major port noise
Posted By: 03F150Fx4
Date Posted: July 24, 2008 at 5:34 PM
aznboi3644 wrote:
The factory recommended ported enclosure will sound like crap and have major port noise
so should I do a sealed box instead? What should the cu ft. size be?
Posted By: dragon51
Date Posted: July 24, 2008 at 6:08 PM
Two ways to do it one have good local shop build it. Or if you have the tools there are a few progams you can use to buid the right box to the specs of your speaker. Once you recive your sub it will have a list of number that tell you what your speaker wants for air space. Those number plug into the program some one here I know has a link I dont have it I have not built a box in years. Your manual might even have a general sealed box design for that sub.
Posted By: 03F150Fx4
Date Posted: July 24, 2008 at 8:45 PM
dragon51 wrote:
Two ways to do it one have good local shop build it. Or if you have the tools there are a few progams you can use to buid the right box to the specs of your speaker. Once you recive your sub it will have a list of number that tell you what your speaker wants for air space. Those number plug into the program some one here I know has a link I dont have it I have not built a box in years. Your manual might even have a general sealed box design for that sub.
I think it recommends 1.25 cu ft. for a sealed box. Here's what I came up with 16"W x 14" H x 13.5" D which would equal and interior volume of 1.25868 cu ft. if I make it with 3/4" MDF. Does that seem a little too small, even though thats what it recommends?
Posted By: dragon51
Date Posted: July 25, 2008 at 12:00 AM
If that is what it comes out to be then not really its a decent size box. Like I was saying you could always plug in the numbers in a program to see if they change once you get all the specs on the sub.
Posted By: aznboi3644
Date Posted: July 25, 2008 at 1:58 AM
some shops just look at the factory recommended enclosures and build that...Not all shops have good enclosure designers
Posted By: 03F150Fx4
Date Posted: July 26, 2008 at 1:14 AM
dragon51 wrote:
If that is what it comes out to be then not really its a decent size box. Like I was saying you could always plug in the numbers in a program to see if they change once you get all the specs on the sub.
well i checked the specs on pioneers website for the sub i'm getting. and 1.25 cu ft. is what it says.. i used the subwoofer enclouser calculator on this site to calculate the box design and volume that i mentioned earilier in my other post. so hopefully it will sound good..
Posted By: dragon51
Date Posted: July 27, 2008 at 10:54 PM
Sweet! Now just get it rocking!
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