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View Full Version : Contemplation: Best box for Two Type-R 12's?



robertark
03-31-2010, 02:29 AM
I've been contemplating on which type of box to get for my Type-Rs (M# SWR-1242D).

Here's what I'm wanting to use the most (from best to worse):

33Hz-Tuned ported box
Sealed box
45Hz-Tuned ported box


I'm thinking I really shouldn't even consider the 45Hz-tuned box, mainly because I'm not going to be playing test tunes in SPL comps. I'm wondering if in all honesty, pushing these subs @ their rated power (500RMS each, using the MRP-M1000 amp).

Would anyone else have any recommendations or suggestions?

SourDeez
03-31-2010, 02:34 AM
any ported box will be better than sealed my type r's wanged my quality sealed box apart so I bought it ported not only does it sound much better but its not gonna implode

TMali
03-31-2010, 02:35 AM
34hz

kr15
03-31-2010, 02:37 AM
Id say your order is correct. The R's seem to like ported, and 33hz would seem to be good, as you should peak around 36 or so. I personally like sealed also, and if it wasnt for the R's liking to be ported, I would say that depending on preference, sealed can be just as good....and I dont know why 45hz would even be considered unless it was a comp only box

robertark
03-31-2010, 02:38 AM
TMali: Can I ask why you chose 34Hz as opposed to 33? Or is there not really a noticeable SQ & SPL difference?

SourDeez: Hah, are you saying your Type-Rs imploded your sealed box? I've heard of that happening with a 5/8 MDF, wasn't sure if it was a true story though.

kr15: Thanks -- yeah, I was going to buy one earlier today, but decided not to until I read up more on ported boxes a bit more. I had a general idea of what I wanted, and have always used sealed boxes, but after reading that the type-rs best perform in ported versus sealed, I'm going to give ported a try. So, yeah, I guess it would be best to find something ranging between 33-35hz.

Thanks for the replies, though :)

TMali
03-31-2010, 02:55 AM
TMali: Can I ask why you chose 34Hz as opposed to 33? Or is there not really a noticeable SQ & SPL difference?



once apon a time, i had some 12" type r's and they like the higher frequencys, like up to 38hz(alot of prefabs are around 38hz)

as for difference between 33 and 34...non really, but it should be easier to find a 34hz box

robertark
04-01-2010, 07:12 AM
I have another question. I'm looking at the Alpine MRP-M1000 specs, and it shows that the RMS output @ 4ohms is 600Wx1, or 1000Wx1 @ 2ohm load.

If I'm not mistaken here, on the Type-R application diagrams, it's showing that for one amp/two subs (running @ 4ohm) would only run 300RMS per sub. Is this right or am I overlooking something here?

Or, is it possible to run the subs in 2ohms @ 500RMS each?

I'm confused, never had to work with such a vast array of applications here!

Thanks!

robertark
04-01-2010, 07:21 AM
Actually, which application would I need to use with the MRP-M1000 if based off of this:

Subwoofer Wiring Diagrams, Two 4 ohm Dual Voice Coil (DVC) Speakers (http://www.the12volt.com/caraudio/woofer_configurations.asp?Q=2&I=42) ?

I'm confused. Any help on how these are supposed to be wired (two type-rs on a single amp) would be helpful, including the jumper config.

odabbs
04-01-2010, 11:55 PM
I believe that with 2 dual 4 ohm voice coil subs that you can wire to either 4 ohm or 1 ohm final impedance. I may be wrong though. I have 2 type r's as well but mine are dual 2 ohm voice coils and I have mine wired to a final impedance of 2 ohms.

robertark
04-02-2010, 12:40 AM
Hmm.. I'm just kind of confused how so many people use the MRP-M1000 use it on the two type-rs, but maybe thats for the dual 2ohm? What about the dual 4ohm? Did I get ripped off here? :(

RAM_Designs
04-02-2010, 12:44 AM
Hmm.. I'm just kind of confused how so many people use the MRP-M1000 use it on the two type-rs, but maybe thats for the dual 2ohm? What about the dual 4ohm? Did I get ripped off here? :(

If you have D4's, yes, you're screwed with that amp. Sell it, return it, whatever...and buy a good 1ohm stable amp.

I Like Waffle
04-02-2010, 12:55 AM
Tune those babies to 45hz, it will really bring the lows out.

robertark
04-02-2010, 06:50 AM
If you have D4's, yes, you're screwed with that amp. Sell it, return it, whatever...and buy a good 1ohm stable amp.

I haven't bought an amp yet, because I'm not sure what amp to get -- any suggestions of a decent/good amp for these subs?

What I was wondering if I got screwed by is buying the 4ohm type rs. Or is there no diff between the 2ohm and 4ohm versions?

robertark
04-02-2010, 06:50 AM
Tune those babies to 45hz, it will really bring the lows out.

So buy a 45hz tuned box for these subs??

Isn't that a bit too much (in my list its last/not even considered.. too high tuned??)

RAM_Designs
04-02-2010, 08:32 AM
I haven't bought an amp yet, because I'm not sure what amp to get -- any suggestions of a decent/good amp for these subs?

What I was wondering if I got screwed by is buying the 4ohm type rs. Or is there no diff between the 2ohm and 4ohm versions?
You can get the Audiopipe 1500 or 1800 if you're on a tight budget. There are a lot of amps in the $200-300 range, so we need to know what kind of money you're working with.



So buy a 45hz tuned box for these subs??

Isn't that a bit too much (in my list its last/not even considered.. too high tuned??)

He was being sarcastic, because a box tuned to 45hz will not hit the lows well. Look for something tuned to 33-35hz, no reason to look elsewhere.

robertark
04-02-2010, 04:36 PM
Between $200-$300 is budget, but really more along the lines of $200-250 would be more economical for me.

Thanks

RAM_Designs
04-02-2010, 07:26 PM
Between $200-$300 is budget, but really more along the lines of $200-250 would be more economical for me.

Thanks

MB Quart DSC-1500.1D Mono Amplifier 1500W + Bass Remote - eBay (item 290418269840 end time Apr-24-10 18:48:40 PDT) (http://cgi.ebay.com/MB-Quart-DSC-1500-1D-Mono-Amplifier-1500W-Bass-Remote_W0QQitemZ290418269840QQcmdZViewItemQQptZCar _Amplifiers?hash=item439e471e90)

robertark
04-02-2010, 08:12 PM
So that will be perfect for running 1ohm final (parallel) such as?:

http://www.the12volt.com/12voltimages/2_4ohm_dvc_1ohm.gif

If so, I guess I'll be pushing ~650-700rms per sub (taking consideration of efficiency/voltage, etc?)

Let me know if I'm right. I won't be buying from eBay (no longer trust people on it) I'll get it elsewhere. Anyhow, let me know and I'll go with this amp. Also, are you sure about this amp? I've never heard of it.

Thanks so much for all your help, though :)

Rob

RAM_Designs
04-03-2010, 12:08 PM
Right, parallel your subs and you'll have a 1ohm load. MB Quart amps are the new forum boner these days for quality power for a decent price...there are a lot of people using them on here. Also, sonicelectronix is a very well known dealer on ebay, nearly 100k transactions with a 99.7% positive feedback...it doesn't get much safer than that.