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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 03-06-2015, 02:53 PM
danieljd18 danieljd18 is offline
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Exclamation E46 Subwoofer Help!!

Hi guys! I have the Harmon Kardon factory setup in my car. I have already gone thru the process of hooking up a line converter to get RCA cables into my trunk for a secondary amp. Everything is working fine! But what i am needing help with is making it sound good. I am running 3 8" rockford fosgate subwoofers (250 rms, 750 RMS total, off of a 1500 watt Hifonics Amp. I am trying to tune the amp to the best of its capability with these subwoofers.

to tune the amp i need to know the frequency of the RCA lines. So i need to know what frequency they are coming from the business stock radio to the amp since i have my RCA cables hooked up before the harmon kardon amp.

Also please help me tune this amp to my subs.

Link to the Subs specs!
http://www.rockfordfosgate.com/products/details/p2d2-8

Link to the Amp Specs!
http://www.sonicelectronix.com/item_...-X1500.1D.html

Also, they are wired in series at a 2 ohm load
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Last edited by danieljd18; 03-06-2015 at 03:00 PM.
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  #2  
Old 03-06-2015, 02:55 PM
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80h-120hz Is that what you need?
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Old 03-06-2015, 02:58 PM
danieljd18 danieljd18 is offline
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Link to the Subs specs!
http://www.rockfordfosgate.com/products/details/p2d2-8

Link to the Amp Specs!
http://www.sonicelectronix.com/item_...-X1500.1D.html

Also, they are wired in series at a 2 ohm load
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  #4  
Old 03-06-2015, 02:58 PM
danieljd18 danieljd18 is offline
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I just need help in general with tuning the thing, It seems no combination i try makes them sound loud enough in my convertible. When 750 rms should sound damn good
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  #5  
Old 03-06-2015, 03:05 PM
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Well if your using the stock head unit your extremely limited. You can put the amp at 80-120hz. But the problem will be you have no cross overs or any tuning you can do with the speakers to gain the highs and keep the lows on the subs. It just isn't possible with the stock head unit.
If you want to get the best sound out of the stock speakers plus the subs you've installed. Your just going to have to bite the bullet and upgrade your head unit.
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Old 03-06-2015, 03:06 PM
danieljd18 danieljd18 is offline
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See I wanted to keep the stock clean look, all single din aftermarket kits look like trash.
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Old 03-06-2015, 03:09 PM
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Quote:
Originally Posted by danieljd18 View Post
See I wanted to keep the stock clean look, all single din aftermarket kits look like trash.
And I agree with you that stock look is the clean and it looks good. But to get the best out of the system... it's just not possible with the stock unit. When I had installed my system in my old E46 I went with the Kenwood KVT-514. It's a single din w/ flip out monitor and it didn't look to bad.
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Old 03-06-2015, 03:17 PM
danieljd18 danieljd18 is offline
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Think the eonon or dynavin would do it?
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Old 03-06-2015, 03:18 PM
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Quote:
Originally Posted by danieljd18 View Post
Think the eonon or dynavin would do it?
I don't know to much about either of those. But if they offer a fully manual EQ and hz/cross over menu yes it'll work.
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Old 03-06-2015, 03:19 PM
danieljd18 danieljd18 is offline
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Okay man thanks, ive looked into it before but i never wanted to get rid of the stock look! thanks for your time man!
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  #11  
Old 03-06-2015, 03:22 PM
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Quote:
Originally Posted by danieljd18 View Post
Okay man thanks, ive looked into it before but i never wanted to get rid of the stock look! thanks for your time man!
No problem at all. The main drawback is that the stock unit doesn't even come close to utilizing the power of the OEM amp. I used the OEM amp w/ the kenwood and it was amazing.
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Old 03-06-2015, 03:24 PM
danieljd18 danieljd18 is offline
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Yeah mine has the HK system and its crap really for stock bass
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Old 03-06-2015, 03:25 PM
danieljd18 danieljd18 is offline
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See i like the look of this how its centered, and i like the unit. i HATE the kits that has the headunit on the left side and uncentered
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  #14  
Old 03-06-2015, 03:26 PM
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Quote:
Originally Posted by danieljd18 View Post
Yeah mine has the HK system and its crap really for stock bass
Well that's for the stock bass. I'm talking about the amp for the speakers. It's actually a REALLY good amp but the stock head unit just isn't enough to utilize it at all. How did you wire your system? Using a line-out converter? or?
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BMW 2006 M3 - stock - SOLD
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Old 03-06-2015, 03:26 PM
danieljd18 danieljd18 is offline
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Yeah its a line out converter
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Old 03-06-2015, 03:27 PM
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Quote:
Originally Posted by danieljd18 View Post
Yeah its a line out converter
Yup. That's my point I mean you can't really do much. Going to have to get an aftermarket unit
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Audi S4 2000 Stage 3 - Dat turbo spool
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BMW 2006 M3 - stock - SOLD
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Old 03-06-2015, 03:29 PM
danieljd18 danieljd18 is offline
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See that alpine I posted? i cant find it online but i want something like that, a single din with a small like 3" screen.
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  #18  
Old 03-06-2015, 03:32 PM
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Quote:
Originally Posted by danieljd18 View Post
See that alpine I posted? i cant find it online but i want something like that, a single din with a small like 3" screen.
You can center any head unit. Just need to make the bezel for it. I just used the generic one.
You can actually buy any bezel for any unit like the one you just posted. And use it on another head unit with very little if any modification.
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Audi S4 2000 Stage 3 - Dat turbo spool
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Old 03-06-2015, 04:28 PM
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My eonon unit has subwoofer out lines if that helps.
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Old 03-06-2015, 04:56 PM
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Where did you install the LOC? On which wires? Is it sending a full frequency signal to your second amp?

If you connected it to the sub output from the H/K sub amp, or to the rear mid-bass drivers, this is likely contributing to your problem. Your new stuff is getting a filtered signal and you're missing out on some of the frequencies you may want.

Your LPF seems to be set pretty high. Try it lower, like at 60 hz, see what you think. Fiddle with the subsonic setting.

Make sure you close the trunk for your tests.

http://wwv.crutchfield.com/learn/car...rs/tuning.html
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Old 03-06-2015, 07:46 PM
danieljd18 danieljd18 is offline
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It's connected to the front speaker and rear speaker preamps before it gets to the hk amp
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Old 03-06-2015, 10:28 PM
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it doesnt matter the wattage it can still sound terrible depending on whether the signal is dirty, and the RCA's from the LOC are getting enough voltage to the amp so it can produce a great big clean signal.

when i tapped into the sub amp i broke it down to the circuitboard and used that. i wouldnt recommend it, looking back on it, the time it took to figure it out proper wasnt worth the slightly improved sound.

you can tune the subs to a perfect range of frequency, but it still wont sound great because youre only as good as your weakest link, which in this case is almost definitely that stock Alpine radio they put in there. looks great, sounds pretty bad
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Old 03-07-2015, 06:16 AM
danieljd18 danieljd18 is offline
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Quote:
Originally Posted by bmw330ci04 View Post
it doesnt matter the wattage it can still sound terrible depending on whether the signal is dirty, and the RCA's from the LOC are getting enough voltage to the amp so it can produce a great big clean signal.

when i tapped into the sub amp i broke it down to the circuitboard and used that. i wouldnt recommend it, looking back on it, the time it took to figure it out proper wasnt worth the slightly improved sound.

you can tune the subs to a perfect range of frequency, but it still wont sound great because youre only as good as your weakest link, which in this case is almost definitely that stock Alpine radio they put in there. looks great, sounds pretty bad
what do you mean stock alpine radio? Is the business CD in the e46 alpine? My radio is the stock business cd
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Old 03-07-2015, 08:09 AM
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Quote:
Originally Posted by danieljd18 View Post
It's connected to the front speaker and rear speaker preamps before it gets to the hk amp
Perfect!

Try the tuning tips. When you set the LPF too high, the subs are trying to reproduce mid-range frequencies and don't give you the punch you want... those frequencies are lost in the trunk and never make it into the cabin due to all of the inherent sound deadening between the output and your ears.

Convertibles are tricky with car audio.

I have a single 12 in my coupe, 500w, and I have it adjusted so the deep bass sounds like it's coming from the center console of the front dash. I've achieved this by properly installing my front mid-bass drivers and adjusting the sub settings - lots and lots of listening and adjusting.

When there is a big delta between the sub frequencies and the mid-bass up front, there are holes that make the sub sound localized in the trunk.
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Old 03-07-2015, 08:34 AM
Bigsean123 Bigsean123 is offline
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I started out with 2 12 inch L7's but I literally had no space in the trunk of my vert so I sold them and built a custom box to sit in the spear wheel well and came up with this.
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As far as the tuning of it I put the radio up and remote up to full bass and turned the volumn to a littler louder than what I normally like and went to the trunk and listens very close while I adjusted the frequency of the amp to where I thought it sounds best.
Remember it's not about being the loudest it's about making it sound the way you like it.
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