Want a SPL system

[impulsed_sv6]

hey guys ive jsut join revently and i have alwasy been a fan of car sterios and doing my own installs on every car ive had now that i have a bit more $$$ to play with i want to get SPL sytem going
about 2 months ago i picked up

Alpine IDA-200 headunit
2x SWR1242D (typr-R) 500rms 1500max

i am currenlty looking into getting the amp for them and this one was recomended to me

MRP-M1000 (1900wmax) 1000wrms

and as far as speakers are concered im wondering if i should amplify them or jsut wire them to the head unit



any suggestion on gettin a loud system

[holdenboy]

Is this for SPL competition or just a loud system?

[impulsed_sv6]

well id like to have an spl system but also have it listenable at low voloumes for like travelling

[HCVP]

Do you actually know what an SPL system is?

If your competing, your first need to figure out what class it is you want to enter.

If it's pure SPL your after, then you can kiss your day to day listening goodbye.
SPL measures sub output only, your speakers do not come into it.
The tuning fq will play a major part in your decibel reading. In SPL cases, the tuning on the sub port is so high, that it makes generall listening a pain.

Also, the amp reccomeded to you is not very suitable.
If they are current model Type Rs, they are 600 rms each, previous model 500.
The amp only produces 1000rms.
Whilst it matches the rated input, and yes they will play fine, it won't give you any headroom which is important.

[acarmody]

HCVP, I will disagree slightly with you here but only slightly. You can build a box that will suit SPL and everyday listening, I don't know if you have seen my SPL box thread but I will be using my SPL box for everyday listening by changing the ports. It will be tuned to 40hz for the comp but I can modify it to be tuned as low as 23hz. Sure you can build a different box that would be better for everyday listening but it certainly won't sound terrible to use the SPL box.

As for headroom, while I agree it is good, its not overly important, my twin L7s are rated to 1500wrms between them but my amps only give them 1400wrms, I will just tune them to suit.

[HCVP]

I still believe headroom is extremely important. With a higher peak fq, the sub will handle more power ,and even more when burping.

Without enough power the amp would clip before the sub ever had a chance to reach it's full potential. We may only be talking 100-200 rms or similiar on paper, but factor in a small voltage drop aswell, and you can expect any manafactuer stated power figures to drop even further.

40 hz isn't too bad, i was thinking a bit higher than that. But i don't know the typical resonate fq of your average Commodore sedan would be..

[holdenboy]

Yeah, you can still have a SPL setup capable of playing music......especially in Commodores (low peak frequency). Mine peaked at 51hz but i could play most RnB / Rap / Drum n Bass songs nicely. Ofcourse turning down the sub level on the head-unit was needed.

To the OP - so you are looking at competing?

My first tip would be to get as much power as possible, disregard the subwoofers rated power as this isnt really relevant for SPL (they only have to handle the power for a second or two - ive seen 200wrms subs take 2000wrms in SPL setups before). So the Alpine mono probably isnt the best amp to go for.

Around $700 should get you 1500-2000wrms.....maybe even look at the MRP-M2000 if you want to stay with Alpine (RRP $999).

Other than the amp / box / wiring, its pretty simple to tweak the system for extra DBs.....read this article (may have to be a member), it has alot of very useful info for first time SPL competitors:

Beginners guide to SPL:
Getting into SPL Competition, the begginers guide. | Decibel Car Audio the SPL Knowledgebase

Box tuning using a SPL meter:
SPL Tuning Your System on a dB Meter | Decibel Car Audio the SPL Knowledgebase

[impulsed_sv6]

well if the amp wont give me the head room how about the next one up wich is the mrp 2000 wich has 2000w rms at 2ohm or 1500 at 4 ohm and i like the idea of having a box that allow you change port size i had a mate who had a simmerlare idea on a box he made in yr 12 woodwork wat he had done was build a dual 12" sealed box and have a slide screen to adjust the size and air flow going thru the port should i look into sumthing like that

also in spl compition are there differnt competing levels such as street, professinal, and crazy

[HCVP]

Yes there are different classes, read HoldenBoy's links. The MRP2000 would be a much better option, but it comes to to what class you want to enter, you need to base your component selection around that.

[impulsed_sv6]

up i wuold probelly jsut go for the street comps as i still need the car to drive around and cruise in

when i pick up my car i will measure my avalible space and see if somecan draw me a plan

[aazn]

shameless plug.. i got a mrp2000 for sale..

brand new in box..

birth cert says 2274w @ 2 ohms

650 posted.

[acarmody]

I still believe headroom is extremely important. With a higher peak fq, the sub will handle more power ,and even more when burping.

Without enough power the amp would clip before the sub ever had a chance to reach it's full potential. We may only be talking 100-200 rms or similiar on paper, but factor in a small voltage drop aswell, and you can expect any manafactuer stated power figures to drop even further.

40 hz isn't too bad, i was thinking a bit higher than that. But i don't know the typical resonate fq of your average Commodore sedan would be..

All true, I would love some bigger amps, I know , for exmaple, that many people feed thier Kicker L7s more than 750wrms everyday and its no problems.

One of the reasons I like the Cadence amps (besides the fact I got them at JB buying price) is that they rate Thier amps at 13.8v and not 14.4v like most companies, and frankly IMO 14.4v is unrealistic.

In my case it works out though, I'm entering the Street Category B, which is 751wrms-1500wrms.

[impulsed_sv6]

ok so ill get a mrp2000 amp and run 0 gauge wire to power itshould i look at getitn a cap for ot as i herd thay waste oftime and also herd they are relly good and for the box should i go vented or sealed

[sweefu]

If you want SPL go a ported box.. you wont need a cap if you do all your wiring properly.

[HCVP]

I think you need to do a little research. There's not even any point in going into the ported vs sealed debate or quetions, these sorts of questions have been asked a lot before, and there is plenty of infomation allready out there.

SPL competing is just like any other sport, hobby, or interest. It takes a lot of time, dedication, and knowledge. You can't buy buy a pair of runners and show up at the next rack and field and expect to come home with a handful of trophies....

Find the class you want to enter, research the entry requirements, and go from there.

Start going to events, and look at what components other people are using, talk to them, most of them you will find are friendly enough, and will be more than happy to take the time out to talk to you.

Buying and testing of components is the LAST step. There is no point in picking an anp out now, and then trying to work everything in around that.

[10WVN]

mates running twin pioneer champ series in custom ported box with a kenwood d class amp.. pumping 900rms to each sub... thing owns, yet to test it though