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Building a system, amp+sub question

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Old May 20, 2004 | 12:27 PM
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Building a system, amp+sub question

Hey guys,
I am a bit new to car audio, so please don't bash me for not searching properly.
I want to match 2 12" subs to an amp, build a custom fit box and either wire it up myself or get it done if too difficult.

E-bay seems to be the best shopping tool, but I don't know what to look for to properly match the right sub to a proper amp. Please help me out.

Also, I have a factory Bose with a 6cd in-dash changed (it is a 2003 Infiniti QX4). I know there has been a lot of uncertainty about upgrading the stock Bose, but do you think it will work ok?

Again, mo most important question is for your recomendations for combination of sub and amp. Thanks again.
Old May 20, 2004 | 01:20 PM
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2 12" RE XXX with a Brutis 1500D amp on each...

*edit... anything is possible.
Old May 20, 2004 | 02:08 PM
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^^^^^^^ thats PLENTY of bass for you. whats your budget?
Old May 20, 2004 | 02:19 PM
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Originally Posted by slickrick
^^^^^^^ thats PLENTY of bass for you. whats your budget?
I don't wanna spend too much.
Seems like I can buy 2 12" for about $100
an amp should cost between 100-200
So I guess I would like to keep it under $300 for 2 subs and an amp.
Do you think it is possible to find good quality for that price? I am not planning on attending any soundoffs or anything, just to have some good sounding, deep base.
Old May 20, 2004 | 02:24 PM
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http://www.edesignaudio.com/kx.htm
those are $130 pus shipping and not bad for the price. 3 year warranty too. an amp for those would run between $150-250.
Old May 20, 2004 | 02:58 PM
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Originally Posted by ShRapNeR
2 12" RE XXX with a Brutis 1500D amp on each...

*edit... anything is possible.

well i guess if your only wanting to spend 300 bucks (which i understand)

then deffinetely would not go this route
Old May 20, 2004 | 03:00 PM
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Originally Posted by slickrick
http://www.edesignaudio.com/kx.htm
those are $130 pus shipping and not bad for the price. 3 year warranty too. an amp for those would run between $150-250.
2 of them would be 130....

ive heard good things about these too...
Old May 20, 2004 | 04:55 PM
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man am i gonna gest bashed for this but i will type it anyway. get 2 sony xplods. the hexagonal ones. should run you around 100-120 for 2. and spend the rest on your amp. i am not pick when it comes to amp but there are quality differences. in my broke days i had a 35x2 rms amp on 1 sub and it beat. nothing like i have now but it worked well. stick to a brand named amp. and look at rms power. 1200 watt speaker don't run at 1200 watts neither do amps. do look at the rms power and try to match the up best you can.

with that typed comince the flaming
Old May 20, 2004 | 06:06 PM
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Very tough to recommend as there is a multitude of subs/amps out there to choose from. Dont have alot of experience myself to give suggestions as I been out of the car stereo loop. Myself I just got a Adire Tempest to put in my car, but havent got it hooked up yet.
Old May 20, 2004 | 06:33 PM
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Originally Posted by ShRapNeR
2 of them would be 130....

ive heard good things about these too...
yeah i said 130 because in your 1st post you mentioned you wanted 2 subs. its a solid deal. lol i wont flame the sony post only because he made a valid point about matching real power and not max power. i can guarantee my old pioneers which i still have f/s for $50 shipped will def. be alot better than any sony sub out there. sorry for the shameless plug. but anyway 2 of those ED subs will be plenty of bass for you especially in a suv. give me them 200-300 per sub and you will be smiling all day.
Old May 20, 2004 | 06:41 PM
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Originally Posted by slickrick
yeah i said 130 because in your 1st post you mentioned you wanted 2 subs. its a solid deal. lol i wont flame the sony post only because he made a valid point about matching real power and not max power. i can guarantee my old pioneers which i still have f/s for $50 shipped will def. be alot better than any sony sub out there. sorry for the shameless plug. but anyway 2 of those ED subs will be plenty of bass for you especially in a suv. give me them 200-300 per sub and you will be smiling all day.

only replied w/ 130 for two is b/c the way you worded it ,,, it kinda sounded like they were 130 apeice....


but ohwell...

i still recomend the XXX's lol
Old May 20, 2004 | 06:48 PM
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nah i got you. lol, yeah xxx is way over budget but its def. a loud sub for sure.
Old May 21, 2004 | 06:12 AM
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Thanks for all the replies.
I was worried this topic was played out and no one will write on it.
Well here are my last two discoveries I wanted to ask you opinion on:

- rockford fosgate hx2

- bazooka base tubes

I don't wanna overcrowd the back of the vehicle with a gargantuan box, big enough to smuggle illegal aliens into the country, lol. And I am also thinking, do I really need 2 12"s or will one do the job?
Bazookas come with an amp, and as far as the hx2 goes, I was thinking of a sealed box + an rockford amp that crutchfield recommended as a perfect match for it (I can't remember the model).
What do you guys think?
Old May 21, 2004 | 06:29 AM
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Originally Posted by Maciek
Thanks for all the replies.
I was worried this topic was played out and no one will write on it.
Well here are my last two discoveries I wanted to ask you opinion on:

- rockford fosgate hx2

- bazooka base tubes

I don't wanna overcrowd the back of the vehicle with a gargantuan box, big enough to smuggle illegal aliens into the country, lol. And I am also thinking, do I really need 2 12"s or will one do the job?
Bazookas come with an amp, and as far as the hx2 goes, I was thinking of a sealed box + an rockford amp that crutchfield recommended as a perfect match for it (I can't remember the model).
What do you guys think?
one of my friends had a Punch HX2 and a rockford amp. and it wanged pretty loud.

im sure that would get the job done. if its still in your budget.

but i cannot say anything about bass tubes. as ive never owned one nor heard one.
Old May 21, 2004 | 10:03 AM
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http://www.edesignaudio.com/o.htm

guaranteed to sound better than the hx2 in sq. its made only for sealed boxes which = smaller box.
Old May 26, 2004 | 04:20 PM
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Some good info here. I am also complete new as it comes to sound systems and am currently on budget. So I thought about getting first something "simple" that I could learn from.
Old May 26, 2004 | 04:45 PM
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find one of those DA(digital audio) dual 10" or 12" in a bandbass box, those things run like 100-150 on ebay if you can find em and then get some cheapy legacy 600 watt 2 channel for 60 bucks, you want to spend cheap, there ya go
Old May 27, 2004 | 04:42 AM
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So to run two subs I need a mono 2 channel apmplfier, where 2 channel means it gives output for each sub. Is that correct?

If subs are rated 200 RMS, than I need 400 watts amp to run both of them, right?
Old May 27, 2004 | 06:28 AM
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Vlad no you don't NEED a 400 watt amp to run them. for them to sound the best they can you do. you need an adm they will do 200 x 2 rms. by the way some withh say " @ 2 ohms or @ 4 ohms" or something similar. most speaker that are in a decent price range are 4 ohms. so that is the wattage you need to look at i.e ( 200 X 2 @ 4 Ohms) not the same as (200 X 2 @ 2 Ohms)

Maciek don't mess with the bass tubes and 1 sub will work depending on how much bass you want. since your pressed for space you could do that or move down to 2 10" subs.
Old May 27, 2004 | 06:55 AM
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Whta's the deal with Ohms? What do they serve? More Ohms is better?

thanks!
Old May 27, 2004 | 08:22 AM
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Originally Posted by Vlad
Whta's the deal with Ohms? What do they serve? More Ohms is better?
Ohms is the measure of electrical resistance. In speaker terms, it's the resistance of the wire in the voice coil. More is not always better. If you have an amp that puts out 250watts into 4 ohms and 500watts into 2 ohms, you should probably get a 2 ohm sub, a sub with dual 4 ohm coils or a pair of 4 ohm subs. That gets the most out of your amp. The downside is that your amp will work harder, create more heat, draw more current and have a lower dampening factor.

-Robert
Old May 27, 2004 | 08:55 AM
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Thekenone, so you say bazookas are crap. Anyone else heard them?

This has turned into quite an informative thread. Good replies guys. Robert, very well explained about the ohms, thanks

Yes, I do like space in my trunk. And even though this is an SUV I am trying to start my system build with (maxima is next), I still want as much free space as possible. It is my only truck and if I got to lay the back seats down to haul some large cargo, I would hate to **** around with a cumbersome box every time. But on the other hand I am a little **** and like things arranged centrally, so small single sub box would maybe seem ackward in the large cargo area.
I looked around on e-bay and saw a sub+box combo that cought my attention. This is a pretty big one though. It has three MTX subs, 250 RMS each, wired for a 4 ohm load.
Someone, please help me out and tell me what kind of amp should I look for, to perfectly complement those?
Thanks
Old May 27, 2004 | 10:45 AM
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This is the part that I am most confused about:

If sub is rated at 200 watts RMS,properly matched amp would be 200 RMS as well, or will one with 200 Max do?
I know that you should look for an amp in the upper 1/3 of the sub's RMS, but is that amp's wattage expressed in RMS watts or Max watts?
Old May 27, 2004 | 11:07 AM
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i would suggest matching the rms on the sub and amp.. that way you will get the most out of the sub


also, even though people hate on audiobahn a lot their subs are pretty good in my opinion... check out the AW1251T 12" subs (400 rms each)
Old May 27, 2004 | 12:40 PM
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dont hate on audiobahn, thats what i run, i have (1) 10" that runs at 1000 watts at 1 ohm RMS, and now the higher the ohms, not the better. i like my 1 ohm set up
Old May 27, 2004 | 01:11 PM
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this is my setup, not what you can afford
Audiobahn AW1008T=1000watts RMS DVC,dual 2ohm's run at one ohm to($150)
Audiobahn AW275HCT=900 watts running at 1ohm($370)
Audiobahn AW475HCT=75x4 at 2 ohms ($375)
+ Alpine CDA7995($225)
-----------------
$1120, out of your budget but i got madddd bumps
Old May 27, 2004 | 01:17 PM
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Originally Posted by suprropmp
also, even though people hate on audiobahn a lot their subs are pretty good in my opinion... check out the AW1251T 12" subs (400 rms each)
Why do people dislike audiobahn? I have been seeing it in a lot of tv programs, in well tuned up cars... but on the other hand, you can find it on e-bay for quite cheap, so there must be a reason...
Old May 29, 2004 | 04:00 AM
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In a previous reply I mentioned the 3 MTX Sub+box I found on e-bay, with total 750 RMS. I couldn't find an amp to match them. Finally I called crutchfield and they told me that I should reconsider buying that 3 sub box, because it would be very hard and expensive to buy an amp for them 'cause it would have to handle 1 ohm.
I don't get that. The subs are wired together into one connection, rated at 4 ohms. At least that is what it said in the specs. Any of you guys can explain that to me in simple terms?
Old May 30, 2004 | 06:03 AM
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Originally Posted by Maciek
The subs are wired together into one connection, rated at 4 ohms. At least that is what it said in the specs.
And when you add multiple subs, you either raise or lower the impedence based on the wiring configuaration.

Originally Posted by Maciek
Any of you guys can explain that to me in simple terms?
With parallel wiring, you take the impedence of the speaker and divide it by the number of speakers. For example, you have three 4 ohm speakers. Wire them in a parallel configuration and you will get 4/3=1.33 ohms. When wiring in series, you add the impedences together. 4+4+4=12.

-Robert
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