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m3gumby 05-05-2009 10:09 PM

New Set Up!
Aiight guys, I've been researching things on here for quite a while and I believe it's time to upgrade my current sound system, I can't handle the cracking old paper speakers any more.

I looked on this thread http://forum.e46fanatics.com/showthread.php?t=528285

and looked through all the amps and I've caught my eye on the Alpine PDX-5. I first wanted to check to see that I wouldn't have to have a balanced signal converter for this amp, the factory wires should plug straight in correct?

I think I'm going to go with the Infiniti Kappa components up front, and leave my sonys in the back for now.

The Amp works out to have:
4x75 plus 1 mono 300 RMS channel which is killer for a nice sub.

I'm going to push the front's and rears at 75 and then have an Infiniti Perfect 10 in the trunk. This should be a pretty nice set-up.

As far as the channels I have now that aren't going to be used (mids up front and mids in the back) do these wires just need to be capped or what?

I appreciate any help through this process. I plan on getting started next week. thanks!

m3gumby 05-06-2009 12:54 AM

I'm also trying to get the wiring diagram correct.

Factory HU outputs > SVEN4 > Alpine Amp
Tweeter & Midbass > Crossover > Alpine Amp
Rear 6.25 > Amp

The amp also has RCA outputs for a sub...why would it have both outputs and inputs? Is it to link up two amps to eachother?

m3gumby 05-06-2009 06:07 PM


BmwAudio32 05-06-2009 06:25 PM

You pretty much have everything correct, however I don't think you need the SVEN4 as I think the Alpine can take the direct balanced signal. You don't have to cap the wires your not using...just disconnect the amp plug from the factory amp, and then splice or cut into only the wires you need. The rest can just remain going into the amp plug. The RCA outputs are for linking to another amp as you have suggested.

m3gumby 05-06-2009 08:09 PM

The amp has RCA inputs for the for each of the 4 speaker channels. Where would the H/U wires go? or would I just need a simple line output converter?

ca1242 05-07-2009 08:39 AM

If the amp takes balanced-differengtial signals, you can solder RCA wires to the OEM amplifier inputs and plug into the amp.
The rule of thumb I use for designing a system is 2-3 more power for bass than other speakers combined. Since our cars suck for bass, I would lean towards 3-times as much power. If you haven't purchased an amp yet, consider splitting into two amps a 4-channel + a separate amp for the sub.

m3gumby 05-07-2009 09:50 AM

alpine's amp has a mono channel that has an RMS of 300 watts...that should be enough for a good thump right? I'm running an alpine type e right now at 85 RMS and it actually puts out a decent amount of bass. I don't like a ghetto bass just a nice low end.

ca1242 05-07-2009 10:43 AM

The the PDX 5 does 300 watts, so there would be no gain in splitting to two amps, as I said, I would recommend a larger one.


Originally Posted by m3gumby (Post 9916473)
alpine's amp has a mono channel that has an RMS of 300 watts...that should be enough for a good thump right? I'm running an alpine type e right now at 85 RMS and it actually puts out a decent amount of bass. I don't like a ghetto bass just a nice low end.

m3gumby 05-07-2009 10:48 AM

such as?

ca1242 05-07-2009 11:16 AM

As I said before, I would recommend using 2-3 times more power for bass than other speakers.

Say you get an amplifier that does 4x100 at 2 ohms and 4x50 at 4 ohms. If you have 4-ohm front and rear speakers, then your total power would be 4x50 = 200 watts.

Based on that, I would suggest going with 400 - 600 watts for bass. This is just a rule of thumb, there are many factors that play into designing a system, but this is a good starting point for a well balanced system.

m3gumby 05-07-2009 11:20 AM

400-600 watts for a single 10" sub? I could see 400-600 watts for a 12" but what 10" sub can handle that much RMS?

The Kappa components can handle 25-100 RMS, the alpine has 4 channels at 75 at 4 ohm which puts the kappas in good sound range. the rear speakers can't really handle 75 RMS but is it possible to turn down the power going to a speaker using gain settings?

ca1242 05-07-2009 12:02 PM

Yes, you can turn down gain settings for the rears.

I have 800 watts going to each of my 10' subs. Rated RMS on them is about 200 watts, I believe. The idea is to have the headroom available and adjust the gains so that there is absolutely no distortion.

The problem is see with your setup is that you want to do a single 10" sub in the trunk. While it would be ok to complement a stock system or even an aftermarket system powered by a head unit, you will not be able to hear it if you amplify interior speakers. Unfortunately, our cars are very bad for bass, so you need to go a bit farther than any other car to get decent bass.

m3gumby 05-07-2009 02:07 PM

I'm understanding a lot more now. It sounds like a 4 channel that puts out 75 RMS to each channel and a separate amp that puts out 4 or 500 watts makes a little bit more sense. It might even cost a little less? I like the look of your set-up from your sig I've been thinking about doing a similar one, do you have more pics?

ca1242 05-07-2009 02:34 PM

Another option is to get two 10's or one 12" or even 2x12's, depending on how much bass you want, and what your needs/space constraints are.

Here's my setup: http://forum.e46fanatics.com/showthread.php?t=273622

m3gumby 05-07-2009 02:53 PM

Sounds like I might have to hold off on this set-up. I need to go listen to a 10" sub at 300 watts and figure out if it'll be enough bass for me. 2 10's is gonna require a lot more money, especially with 300 or 400 watts each

Kronk42583 05-07-2009 07:13 PM

the alpine PDX is nice in that it is compact, and takes the balanced inputs, but im not sure exactly how you run the factory wires in. usually there is a plactic adapter that you crimp your car's wires to and then plug in to the amp. this seems like a nice feature, but in reality, Line output converters like the one i use can be found for as little as $20. as for the non used wires, i simply taped the ends off and left them there in case i wanted to install the stock setup again.

i'm also gonna piggyback on your thread. im thinking about upgrading my setup as well. i have a 4X70w amp running fronts and a 10inch sub, and the sub leaves a bit to be desired, but the biggest issue is the fronts, i have alpine R 5.25inch. there is almost no midbass and the tweeter is way too bright even at the -9Db setting. simply turning the treble down on the deck just make the sound bad. i am reluctant to push 800w to my 10 inch sub as i don't care for earth shaking bass, i just want a more full and natural sound. this sub in my old Saab hit very hard at only 200w. i am planning on mounting 6.5 inch components to the door frame, as the stock mounting setup stinks. i think the bigger woofer and better install location might take care of a lot of the bass problems and soundstage problems i have. i just don't know what to get. i want good midbass and accurate sound, and smooth highs. can't spend a ton of money. i'm looking to spend $120-$180 TOPS on ebay(had great luck with great prices) for a set. its a bonus if they will also fit in the rear as i plan to replace the rear components later this summer. i have seen some diamond d362 cheap. and some focal access series. people seem to be high on them. any other suggestions?

(note: m3 gumby, i plan on upgrading to 300 or 400 watts on my 10. i think that should by plenty, especially with well installed quality components.)

m3gumby 05-07-2009 08:19 PM

I've been looking around and anything over 300 watts for an amp is gonna get pretty pricy. I have a feeling that 300 watts to a single 10 will put out a good low end. I'm on a budget, so it'll have to do for a while. I actually have a LOC for an amp running a sub now so I'll just use that rather than soldering wires together. Anyone object to infinity kappa components and infinity perfect 10 sub?

adrian320 05-08-2009 10:17 PM

How much will be the budget range for the Infinity Perfect 10" sub?

m3gumby 05-10-2009 02:03 AM


adrian320 05-11-2009 09:48 PM

Ok, I thought that if it were in the 250 range you could consider a FI Q 12" or a Acoustic Elegance AV12, since they are in that particular range and seem to have a promising rep. At least the AV12, since the Q has a pretty good reputation already.

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