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Stereo Equipment (what kind to get and different ways of hooking it up)
- Ask any question you like in here and I have a few of my own
started by The_Mad_Warrior
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September 9th 2009 at 8:15 AM
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The_Mad_Warrior
Gate Attendant
The_Mad_Warrior is a laid off bum.
Updated Wednesday at 9:59 PM
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1465 Posts 
Group: Members
Member Since: February 2nd 2006
Location: Madawaska, Ontario, Canada
Current Sled: 1997 MXZ 670
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So I thought I would make a whole topic where anyone can ask any stereo question they like. I pretty much know all the basics how to hook up an amp, subs, speakers, custom box building (mostly have a question about it), and cd player hook ups.
Now any questions you have ask in here and see the answers you get.
So on to my questions.
First: Ok I hear a lot of talk about people changing thier ohms in subs to make it louder. How the h*ck do they do that? lol I been really thinking about this and have no idea how they do that. Do they just change it in the amp or do they change the sub too. I was at a bass competetion in Barrie and some guy said he usually keeps his sub at 2 ohms for driving around but changes it to 0.8 ohms for competetion? How can you do this?
Second: When building a sub box for the back of a truck I am limited to space. I was wondering if I could use thinner wood then 3/4" for the back piece to save on some room? And if so what could I use? I was thinking on snading it down with a hand sander for a few hours and see where I get but will that just blow apart? I have a 12" JBL GTO Series (just a cheap sub I got from best buy). But it is pushing 300 rms and 1300 watts max. So Will this sub just blow the box apart if I use smaller wood?
Thanks a lot.
I will be glad to help answer anyones questions they may have. :D
If you cant fix it with duct tape, tylnol, or band aids your screwed.
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Site Supporter
Group: Site Supporters
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September 9th 2009 at 9:21 AM
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XLT96rider
Other sports play once a week, but this sport is with us every day.
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942 Posts 
Group: Members
Member Since: January 7th 2009
Location: Wausau, Wisconsin, USA
Current Sled: 1996 Polaris XLT Special
2008-2009 Miles: 1000+
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Quote originally posted by The_Mad_Warrior
First: Ok I hear a lot of talk about people changing thier ohms in subs to make it louder. How the h*ck do they do that? lol I been really thinking about this and have no idea how they do that. Do they just change it in the amp or do they change the sub too. I was at a bass competetion in Barrie and some guy said he usually keeps his sub at 2 ohms for driving around but changes it to 0.8 ohms for competetion? How can you do this?
You can change your ohms rating by the way they are hooked up. Parallel or series. It's been a long time since I've done any of this, so I don't remember off hand which way drops it. I've also heard of people putting in resisters in line with their subs to drop ohms, but why not just get the subs you really need in the first place.
Quote originally posted by The_Mad_Warrior
Second: When building a sub box for the back of a truck I am limited to space. I was wondering if I could use thinner wood then 3/4" for the back piece to save on some room? And if so what could I use? I was thinking on snading it down with a hand sander for a few hours and see where I get but will that just blow apart? I have a 12" JBL GTO Series (just a cheap sub I got from best buy). But it is pushing 300 rms and 1300 watts max. So Will this sub just blow the box apart if I use smaller wood?
A few buds and I used to build a ton of boxed back in the day and pretty much used only 1/2" lumber, but what we used was a very high density mdf board. Seemed to work very good for us. For plywood, I wouldn't use anything less than 3/4" though.
If you are limited to space (like most trucks) there are ways of "fooling" the subs to make them perform like they are actually in a larger box. Putting a layer of insulation inside the box works. There are others, but like I said, it's been a while.
If you are building a ported box, play with port lengths, there are formulas for tuning boxes just by the size and length of a port. We always used a 3" X ?. It'll vary with box design and the frequency you want. We always use pvc pipe for ports. One trick is to round all the ends of the port for smooth air flow with a file or something. Believe me, it's noticeable.
A sealed box will hit pretty hard yet, but will be a little quieter, and the tuning is how you build the box (mainly size). This is where the insulation trick comes in handy. You can build it a little smaller then recommended, and loosely pack it with a fiberglass insulation. Pack it full, but loosely.
Going to a bandpass box, you have so many more options to choose, but the boxes can get very large. You can tune the actual sub enclosure, the "chamber" in front of the sub, and the port. We've built a couple of bandpasses and they have been very impressive, even with really cheap subs in them.
Seal you boxes as good as possible, doesn't matter if they are closed, ported, or bandpass. Glue all the joints and use something like liquid nails on the inside of all the seams. Air leaks sound like crap.
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September 9th 2009 at 9:22 AM
[ Modified September 9th 2009 at 9:23 AM
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pudamobile
Small-Bore Fanatic
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759 Posts
Group: Members
Member Since: November 7th 2006
Location: Finley, ND
Current Sled: '96 ZR 440 Racer
2008-2009 Miles: 390
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I'm no audio expert...but this is my take
#1. He must have a dual or quad voice coiled sub. Each coil produces a load in ohms. If a DVC sub with 2 ohm coils is run in series, it presents a 4 ohm load to the amp...but if they're run in parallel, it produces a 1 ohm load to the amp.
#2. I've built several pickup boxes...if you use thinner wood only use it on the back side and brace it well with 2x4s in the corners. nothing worse than having too much rumble and the box falling apart. Your JBL should be able to bump pretty nice in a pickup cab....I had a pair of 12w3 JLs in my '99 F-150 extended cab and it was GREAT plenty.
^DANGIT, XLT96RIDER beat me to the punch!!
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September 9th 2009 at 10:02 AM
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The_Mad_Warrior
Gate Attendant
The_Mad_Warrior is a laid off bum.
Updated Wednesday at 9:59 PM
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1465 Posts
Group: Members
Member Since: February 2nd 2006
Location: Madawaska, Ontario, Canada
Current Sled: 1997 MXZ 670
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Quote originally posted by XLT96rider
Quote originally posted by The_Mad_Warrior
First: Ok I hear a lot of talk about people changing thier ohms in subs to make it louder. How the h*ck do they do that? lol I been really thinking about this and have no idea how they do that. Do they just change it in the amp or do they change the sub too. I was at a bass competetion in Barrie and some guy said he usually keeps his sub at 2 ohms for driving around but changes it to 0.8 ohms for competetion? How can you do this?
You can change your ohms rating by the way they are hooked up. Parallel or series. It's been a long time since I've done any of this, so I don't remember off hand which way drops it. I've also heard of people putting in resisters in line with their subs to drop ohms, but why not just get the subs you really need in the first place.
Quote originally posted by The_Mad_Warrior
Second: When building a sub box for the back of a truck I am limited to space. I was wondering if I could use thinner wood then 3/4" for the back piece to save on some room? And if so what could I use? I was thinking on snading it down with a hand sander for a few hours and see where I get but will that just blow apart? I have a 12" JBL GTO Series (just a cheap sub I got from best buy). But it is pushing 300 rms and 1300 watts max. So Will this sub just blow the box apart if I use smaller wood?
A few buds and I used to build a ton of boxed back in the day and pretty much used only 1/2" lumber, but what we used was a very high density mdf board. Seemed to work very good for us. For plywood, I wouldn't use anything less than 3/4" though.
If you are limited to space (like most trucks) there are ways of "fooling" the subs to make them perform like they are actually in a larger box. Putting a layer of insulation inside the box works. There are others, but like I said, it's been a while.
If you are building a ported box, play with port lengths, there are formulas for tuning boxes just by the size and length of a port. We always used a 3" X ?. It'll vary with box design and the frequency you want. We always use pvc pipe for ports. One trick is to round all the ends of the port for smooth air flow with a file or something. Believe me, it's noticeable.
A sealed box will hit pretty hard yet, but will be a little quieter, and the tuning is how you build the box (mainly size). This is where the insulation trick comes in handy. You can build it a little smaller then recommended, and loosely pack it with a fiberglass insulation. Pack it full, but loosely.
Going to a bandpass box, you have so many more options to choose, but the boxes can get very large. You can tune the actual sub enclosure, the "chamber" in front of the sub, and the port. We've built a couple of bandpasses and they have been very impressive, even with really cheap subs in them.
Seal you boxes as good as possible, doesn't matter if they are closed, ported, or bandpass. Glue all the joints and use something like liquid nails on the inside of all the seams. Air leaks sound like crap.
Ya I know air leaks sound like crap lol. Had a few to patch up. So my JBL is duel voice coil so I could run it parrella instead and it would be running off 1 ohm? Right now it has 2 negatives and 2 positives. What JBL did was put a metal piece between the one negative and the one positive. (Dunno how thats suppose to work but whatever). Anyways and then you are left with the other negative and positive. So instead of I tok that metal piece out and had 2 channels ran to it. Like one wire to each negative and positive. So 4 wires all together hooked to the amp is that what changes the ohms?
OR
Do you only have one wire running from the amp and splice into it for one coil and then run the end to the other coil? So you have 2 wires coming from the amp but it gets spliced and then it has 2 wires from each wire?
If you cant fix it with duct tape, tylnol, or band aids your screwed.
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September 9th 2009 at 10:26 AM
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tdgbigfoot
Certified sledaholic
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1277 Posts
Group: Members
Member Since: September 12th 2008
Location: Albany, Vermont, USA
Current Sled: 99 SKS 700, 96 Mach Z 780
2008-2009 Miles: 500
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Anybody got a four channel in, four channel out amp for sale?
Looking for one.
2000 Indy Trail Touring 550, 1999 Indy SKS 700, 1996 Mach Z 780, 1994 Wildcat 700, 1991 Formula Plus, 1990 Safari LX, 1989 Indy 400, 1988 Tundra Skandic, 1987 Citation, 1986 Indy Trail 488, 198? Bravo
1969 Corvette 350
2000 Cheroekee - 4 1/2" lift, & other goodies
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September 9th 2009 at 10:26 AM
[ Modified September 9th 2009 at 10:28 AM
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Quinlan
Department of Corrections
Quinlan is a little disappointed that he received HMK Highmark 4 boots instead of the Highmark Pros as he had anticipated...
Updated Yesterday at 6:19 PM
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9720 Posts 
Group: Moderators
Member Since: December 8th 2003
Location: Fargo, ND, USA
Current Sled: 06 SP 440/700, 98 ZR 600
2008-2009 Miles: 365
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Wiring WizardPlay with that for awhile and it might help you understand how to wire them up properly. It's usually wise to match the nominal impedance of your subs to the amp output. For example if you wire your subs down to a 1 Ohm load, your amp better be stable at 1 Ohm, etc. Your maximum power will be at the amps lowest impedance.
2006 Arctic Cat SnoPro 440/700 EFI
1998 Arctic Cat ZR 600 EFI Custom
1996 Ski-Doo FormulaIII 600
A mountain lion roaming the prairie found a bull, killed it and ate the entire bull. With a heavy belly, unable to walk, the lion laid in the tall grass moaning and roaring. Soon a hunter, attracted by the roaring, shot and killed the lion.
Moral: When you're full of bull, keep your mouth shut!
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September 9th 2009 at 11:15 AM
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Ugly_old_Poo_kid
techno-bumpkin
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1077 Posts
Group: Members
Member Since: March 18th 2007
Location: Walworth, NY, USA
Current Sled: 05 Edge & Frankenstorm II
2008-2009 Miles: 165
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The purest sound is achieved by twisting all the wires together and releasing the smoke, then you hear pure silence.. 
Actually, I fiddled about with that stuff years ago. But decided that constantly replacing that chit was expensive, and moved to sledding where you have much more fun with your money..
I have a set of 10" MTX Road Thunder II's as the woofers in the box speakers for my barn stereo, they sure knock the dust off the rafters when they get cranked up. I was really surprised that MTX made them in both 4 ohm and 8 ohm versions.
Putting stuff in parallel cuts the ohms in half. Putting them in series doubles.
95 - Storm 800 - Modded - AKA: FrankenStorm - Totalled near 100mph at Tug Hill!
96 - XLT/SP with Storm 800 trip/trip and now EFI - FrankenStorm II lives...
95 - RXL -- Sale Pending --
05 - Edge 800 long track - Stayin' stock for now..
---------------------------------------------
It made me more compassionate, more empathetic, more nurturing...
I FEEL LIKE I'M TRAPPED IN MY OWN WORST NIGHTMARE!!!
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September 9th 2009 at 12:51 PM
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The_Mad_Warrior
Gate Attendant
The_Mad_Warrior is a laid off bum.
Updated Wednesday at 9:59 PM
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1465 Posts
Group: Members
Member Since: February 2nd 2006
Location: Madawaska, Ontario, Canada
Current Sled: 1997 MXZ 670
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Quote originally posted by Ugly_old_Poo_kid
The purest sound is achieved by twisting all the wires together and releasing the smoke, then you hear pure silence..
Actually, I fiddled about with that stuff years ago. But decided that constantly replacing that chit was expensive, and moved to sledding where you have much more fun with your money..
I have a set of 10" MTX Road Thunder II's as the woofers in the box speakers for my barn stereo, they sure knock the dust off the rafters when they get cranked up. I was really surprised that MTX made them in both 4 ohm and 8 ohm versions.
Putting stuff in parallel cuts the ohms in half. Putting them in series doubles.
Hey life cant always be about sledding.
Gotta have other hobbies too. 
If you cant fix it with duct tape, tylnol, or band aids your screwed.
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September 10th 2009 at 12:01 PM
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westman995
Advanced Member
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1927 Posts
Group: Members
Member Since: February 22nd 2008
Location: St. James, Minnesota, USA
Current Sled: 98 rmk 600 - zx mod
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Quote originally posted by XLT96rider
You can change your ohms rating by the way they are hooked up. Parallel or series. It's been a long time since I've done any of this, so I don't remember off hand which way drops it. I've also heard of people putting in resisters in line with their subs to drop ohms, but why not just get the subs you really need in the first place.
As far as the resistor thing, i think that is worthless. As far as i know, wiring in a resitor will work, but in the end its just throwing away power cuz the rest of the power will just be in the restistor. But that is just what i have read so i dont know positively.
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