Alpine Type R subwoofers

cljr120 · 08-04-2007, 01:34 AM

I am looking to install two 12' Alpine Type R Subwoofers(http://www.alpine-usa.com/US-en/prod...odel=SWR-1242D)
in my car but i am really confused on how to find the right amp. They have a peak of 1500watts a piece and have 500 rms. What kind of amp do i need to power these two subwoofers?

RedGTiVR6 · 08-04-2007, 08:37 AM

thread moved to the car audio subforum since this forum is dedicated to putting PCs in cars.

I'd recomend checking the FAQ sub-froum in this Car Audio forum.

XC-C30 · 08-04-2007, 09:13 AM

they are each double 4Ohms, so if you have 2 you could wire them in any way you want actualy.

wire them both parrallel and together in series = 4Ohm
wire them both series and together in parrallel = 4Ohm
wire them both parrallel and together in parrallel =1Ohm
Wire them both in parrallel and give them each their own channel = 2Ohm (not recommanded)
wire them both in series and give them each their own channel = 8Ohm (als not recommanded

Now why don't I recommand the last 2 options? Simple: It will be harder to let the woofers play equally, which can ***** up the sound.

If I were you, I'd take te first or second option. In that case, you'll need an amp that puts out around 1x 1000Watts RMS @ 4Ohm

Or is you want to go cheap, go with option 3 And buy an amp that puts out 1x 1000watts @1Ohm

monkeyracer · 08-06-2007, 09:18 AM

Quote: Originally Posted by XC-C30

Or is you want to go cheap, go with option 3 And buy an amp that puts out 1x 1000watts @1Ohm

Make sure it is stable at this rating, a lot of amps may give this rating, but are only stable as low as 2 ohms...

XC-C30 · 08-06-2007, 02:45 PM

maxgtr2000 · 08-06-2007, 09:07 PM

Quote: Originally Posted by cljr120

I am looking to install two 12' Alpine Type R Subwoofers(http://www.alpine-usa.com/US-en/prod...odel=SWR-1242D)
in my car but i am really confused on how to find the right amp. They have a peak of 1500watts a piece and have 500 rms. What kind of amp do i need to power these two subwoofers?

It may be easier to find 2 amps that run at 500watts rms at 2 ohms (class d preferrably). A friend of mine had a pair of the 2005 model 12s and had an alpine mrd-350 on each and the bass was unreal.

XC-C30 · 08-06-2007, 11:11 PM

why does everybody think, that all that matters is loud bass???

What about control? flexibility? ease of use? soound quality? USing 2 separate amps will be more difficult to tune/setup right..... So maxgtr2000..... bad idea

monkeyracer · 08-06-2007, 11:37 PM

if your interested in SPL, then all that does matter is loud bass.

I had two rockford fosgate 1001BD amps, each wired to it's own Pioneer TSW-2000SPL, and it sounded great, over 150dB. Sure SQ suffered, but it wasn't an SQ or SQL setup.

Which btw had the bd sync system that allowed two amps to be perfectly synced in mono operation.

It's not hard if you have the right stuff..

maxgtr2000 · 08-07-2007, 12:01 AM

Quote: Originally Posted by XC-C30

why does everybody think, that all that matters is loud bass???

What about control? flexibility? ease of use? soound quality? USing 2 separate amps will be more difficult to tune/setup right..... So maxgtr2000..... bad idea

Did he say he was going for sq? nooooo. I just stated what someone else had if he wanted to go that route.

XC-C30 · 08-07-2007, 12:51 AM

I just don't get why you should focus on 1 thing. Sure, hard hitting bass is nice. But why should you only have to go with that, if you can aswell create an install that sounds good in the first place but also can produce te hard hitting bass if needed?

You can't argue that a good sounding install will more likely keep you enjoying your music than an install that has the purpous of keeping everyone awake in a 1-2mile radius....

And furthermore: going with 1 amp increases the ease of use. It's not like playing at 1Ohm improves sound quality, but it WILL be easier to setup correctly than using multiple amps.... And have you thought about power consumption and heat dissipation?

monkeyracer · 08-07-2007, 09:36 AM

The original poster is probably gone to a new forum, so this thread has now turned into something totally different.

Here's my theory on tuning:

If you have a system that can produce SPL like anything over 145db, then when you play it at an actual real world listening volume, the bass will have a little more control, and sound good as well. The above mentioned system (2 rocks and 2 premier) only started to get sloppy at above 140db, which was only reached when being tested. On average, every day use, I only had it at about 125-130db, which it sounded amazing, SQ was there. So, although it wasn't the focus, it was a byproduct. Also, the car was sound dampened pretty well, so the neighbors didn't really hear it. Outside the car, I'd say it wasn't any louder than the stock non dampened system at full volume.

Power consumption, heat:
These amps drew about 90 amps each, plus I had a 4ch that drew around 30 amps, plus all the other stuff the car normally had to deal with. My headlights constantly dimmed, and the capacitors didn't seem to help that. Upgraded alternator helped a little, but it was a current hungry beast. It didn't really produce that much heat though, my crappy sony amp made more heat than the rox ever did. That accounts for efficiency though.

I agree though that two amps are harder than one, but a lot of amps have similar sync systems that allow the output to be the exact same on both amps. It's a matter of paying for it. However, for the same or less you could find one amp capable of performing at 1 ohm.

kajenius · 08-08-2007, 08:24 PM

get a mrd m1005.. puts out a 1000 rms at 2 ohms.. also made by alpinee.. its there digitall linee.. all he controlls are digitalized.. i had it running my TYpe X 12 @ 2 ohms n it reallie tore my car apart...

XC-C30 · 08-08-2007, 09:05 PM

Quote: Originally Posted by kajenius

get a mrd m1005.. puts out a 1000 rms at 2 ohms.. also made by alpinee.. its there digitall linee.. all he controlls are digitalized.. i had it running my TYpe X 12 @ 2 ohms n it reallie tore my car apart...

He needs 1000@ 1or4Ohms, NOT@ 2Ohms, unless he wants to give each woofer a separate amp..... Wich is a bad idea.

maxgtr2000 · 08-09-2007, 12:30 AM

Quote: Originally Posted by monkeyracer

The original poster is probably gone to a new forum, so this thread has now turned into something totally different.

Here's my theory on tuning:

If you have a system that can produce SPL like anything over 145db, then when you play it at an actual real world listening volume, the bass will have a little more control, and sound good as well. The above mentioned system (2 rocks and 2 premier) only started to get sloppy at above 140db, which was only reached when being tested. On average, every day use, I only had it at about 125-130db, which it sounded amazing, SQ was there. So, although it wasn't the focus, it was a byproduct. Also, the car was sound dampened pretty well, so the neighbors didn't really hear it. Outside the car, I'd say it wasn't any louder than the stock non dampened system at full volume.

Power consumption, heat:
These amps drew about 90 amps each, plus I had a 4ch that drew around 30 amps, plus all the other stuff the car normally had to deal with. My headlights constantly dimmed, and the capacitors didn't seem to help that. Upgraded alternator helped a little, but it was a current hungry beast. It didn't really produce that much heat though, my crappy sony amp made more heat than the rox ever did. That accounts for efficiency though.

I agree though that two amps are harder than one, but a lot of amps have similar sync systems that allow the output to be the exact same on both amps. It's a matter of paying for it. However, for the same or less you could find one amp capable of performing at 1 ohm.

It would be better to go with dual 2 ohm subs then you can end up with 2 ohm in series then almost any class d will do. It's harder for a noob to go with the dual 4 cause then you get these questions and have to decide massive power at 4 ohms or go with a 1 ohm amp. I don't know if they changed this but it has been a long time since I looked but 1 ohm stable amps only had the guarantee that they were stable, not that it was good to run it that way. The reason why my friend ran 2 mrd-300s were that it was all alpine and had the digital link so he could control the amp frequencies and what not through the headunit so it sounded good playing sq and spl, it was a really clean setup. If you are not competing in sq I don't see the need to only stay with one amp. if you want sq go with one sub, it will be simpler. You can also go with a class a/b 4ch amp and bridge it to get 500x2 at 2 ohms. I'm not into spl but I have a ported box and 2 12s... I like it that way.

PugFunk · 08-09-2007, 06:16 AM

note that the new alpine series amps will not run their subs properly. Bridged the front gives differnt values than the back bridged channel so you would need at least 2 of their amps.

Go for a differnt brand monoblock. the R type 4ohm duel voice coils are very loud. I am not sure if you have hurd them in a car?

My friend has just put the 2ohm r Type sub in his sigma and his car is falling to bits. Honestly try with one and see how it sounds. I assume you still wish to be able to hear not just the low's through your system.