Need advice and approval

[benzinabrera]

Hi Guys, im new here so please bear with my stupidity at times

Ok so i will break it down.

I drive a Alfa Romeo Brera and the sound setup in these cars are truly horrible, as soon as you start driving the midbass falls flat and more detailed sounds dissepear, also they cant go very loud without distorting. so i decided to plan my setup.

So far what i have is:

-2x Boston Acoustics GTA 602 amps

-A lot of silent coat sound dampner

-Nice thick MDF spacers thats been made off a template of the original plastic spacers

-Aluminium Plates cut to the correct shape to seal the big open hole in the door

What im thinking of coupling with these:

-Rockford Fosgate P1675-S 60W RMS Splits

-Rockford Fosgate P1S4-8 8inch subwoofer

-Sealed MDF Box Made to size as advised with rockfords box advisor

-Lightning Audio 4 Guage Wiring Kit

Ok, standard the car has 6.5 inch speakers in front, 3 inchers in the back and no subwoofer.

I want to disconnect the 3 inchers as nobody sits in the back anyway and my personal opinion is they will only throw off the sound balance

i want to run the system off my standard headunit and luckily the boston amps have built in speaker inputs so i dont need to mess with line converters etc, etc.

my only thing i wonder about is if the amp does low pass filtering on the splits, does that mean the midbass will also be cut out from the splits? the reason im asking is that isnt it kind of pointless to purchase higher end splits if they wont do any form of punching?

also i like tight and punchy bass but i want to preserve the space in my boot, i want to mount it in the side of the boot like alfa would usually do with their bose systems.

I want to silent coat out the door, seal it with the aluminium plate i had made and also silent coat the plate to make sure it doesnt resonate. and ofcourse use the mdf spacers instead of the oem plastic ones

Ok now for the questions, Are these rockford speakers good speakers?

Should i rather buy a rockford wiring kit also or should the lightning audio kit be good enough?

Would you guys reccomend anything else in the same pricerange?

Would you do anything different and why?

And now for the grand question, what do i want it to sound like??

Well, honestly im not a serious BIG sound guy i like tight bass and smooth splits but to put things in perspective, to me a nice sound system would be your typical Bose, Harman kardon Logic 7 BMW sound system or Lexus Mark levinson sound, i know to many audiophiles these are crappy systems but like i said im not a big sound connoisseur so to me these are usually Nice.

Do you guys think my rockford system will be able to sound on par with these factory type systems or will fail?

Please feel free to ask questions, criticize, advise etc etc

Click to read more...

 

[AndrewHD 10+ year member]

Sounds like you have a good platform for your doors. What is your price range? That sounds like a pretty good build with the space you have. Just don't expect anything crazy coming from that Rockford 8"

 

[AndrewHD 10+ year member]

I probably would get a 4 channel and use 2 channels for the fronts and bridge the last 2 channels for your sub. Your speakers would probably not play as loud and still will distort without an external amplifier

 

[benzinabrera]

Hi andrew thanks for the reply, ok, to awnser your questions.

Price range:

Split system about $200

Subwoofer about $150

Im glad you feel it seems like a pretty good build, fortunately the brera doesnt have a big interior so i also believe given the space it should be nice.

When you say i should not expect anything crazy, what exactly would you define as crazy because as i said i dont want a pavement pounder, just want some soothing punchy tight bass, im not a big lover of these big reverberating ported type subs and prefer a more OEM feel to it. Also the main reason i chose the rockford is because its the only sub i could find of that size and in my pricerange that matches the RMS from the amp best, most other 8 inchers are either too high in Rms or the price is too steep.

As for the amp situation, i dont think i typed what i want to do with it properly, sorry about that. i have 2 of these boston amps, i want to use one of them dedicated for the splits and the other bridged dedicated for the subwoofer.

Do you think with these 2 amped, it will sound like a nice "complete" system?

 

[AndrewHD 10+ year member]

Yes, it should sound complete since those amps have built in crossovers. Just cross the front 6.5's to around 100-125hz and the sub at around 60-80hz and it should sound pretty decent

 

[benzinabrera]

Ah thanks, that was very helpful, im pretty stupid when it comes to Hz settings so having someone give me a ballpark for what i want really helps //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif

 

[AndrewHD 10+ year member]

No problem. Your setup sounds nice and simple which is also my preference. Let us know how it sounds and if you run into anything

 

[Side Show 10+ year member]

I think you'll find the 8"to be a bit weak, prob go for a nice 12"sealed

 

[benzinabrera]

thanks i will definitely post a build thread once i got all my sound equipment together. i also prefer a simple but powerful install, OEM+ if you will..

Hi Side Show, unfortunately a 12 inch sub is a tad big and if im not mistaken has slow bass response vs a smaller sub? but above everything else you must remember i think a 6 inch bose subwoofer sounds nice so to my ears a 8 inch rockford should be the dream haha

 

[Side Show 10+ year member]

supply a 12" with sufficient pwr and it'll sound great, every sub will have slow bass response on low pwr

 

[benzinabrera]

ok fair enough, i hear you, i just still have a space issue for a 12 inch sub, i have a space that is the perfect size for the 8 incher in my boot that wont obstruct anything, i must just remove the cd shuttle and replace the block they built the cd shuttle in with a subwoofer box, fortunately the cd shuttle space is exactly the size box advisor reccomends for the sub

 

[Jeffdachef 5,000+ posts]

thanks i will definitely post a build thread once i got all my sound equipment together. i also prefer a simple but powerful install, OEM+ if you will..
Hi Side Show, unfortunately a 12 inch sub is a tad big and if im not mistaken has slow bass response vs a smaller sub? but above everything else you must remember i think a 6 inch bose subwoofer sounds nice so to my ears a 8 inch rockford should be the dream haha

Thats proven as mainly false myth. Also for your setup, it should be fine really for the budget listed and how your listening preference is. Make sure you seal up all the big, medium, and small gaps on your door panels with deadener and fully deaden the outermost layer of your car door. Make sure to grab some foam/rubber weather stripping to build a seal on the speakers here's a video on this subject http://www.caraudio.com/forums/car-audio-build-logs-cars-trucks-suvs/588381-how-i-made-my-speakers-louder-cheap.html its on the link in the thread. Seal up the baffle point with deadener also, you dont want any sound waves leaking out anywhere except to your cabin. This should make a huge difference in your midbass response. You'd also want more power to that 8 or it'll sound cruddy.