Just wondering...

[Mrk_Mickey]

Hey guys,

Ages back I installed almost 2k worth of system into my car. It still goes great but I find recently I've been lacking a certain depth of sound due to me listening to my sony stereo in my room so much, which has perfect sound levels

I don't quite know if it's this, but I think I'm lacking mids. At the moment I have four kicker KS splits amped up to a jaycar 4x100 RMS Full-Range Digital Amplifier, and a 12" kicker L7 sub amped to a jaycar 1x1000w RMS @2-ohm Class-D Linkable Monoblock Amplifier. The sound is really crisp and clear, however if I turn the sub down/off all I've got is high's. It's crap!

I think it leads down to amp tuning...these are my current settings:

4-channel (channels 1+2 and 3+4 are tuned identically)
gain: 55%
Hi-Pass Filter selected (LPF/FULL/HPF)
crossover: 40% (between 50Hz and 500Hz)
Bass: 12 dB (0dB-18dB)

Monoblock:
gain: 70%
subsonic: 15% (between 10Hz and 60Hz)
LPF: 20% (between 35Hz and 300Hz)
Bass Boost: 35% (0dB-18dB)
Phase: 20% (0-180.....?)

I'll provide pics if these figures are too brand-specific to mean anything to the guru's lol..

Basically I'm looking for more depth from my speakers, because they literally sound like headphones.

[HOLEIN1]

just having a quick glance it looks like the HP is set too high on your amp driving the speakers. depending on the individuall brand type of speaker, generally soeaking the HP should be set in between 60 and 120 Htz, although as i said this is a generalisation and could move either way from this... lowering this crossover point will give you more midbass, however you will have to play around with the gain so that they dont start bottoming out... from the information you have given you HP is approximatley around 180htz, so as you probably can realise lowering this will open up the midbass a bit more...

as long as you are still running the standard crossover you wont damage your tweeters by setting it too low (this is always a danger when running components fully active), however i would advise that you start off with low volumes as the midbass will start distorting and potentially damage them if you go in 'too hard too fast'... trial and error is the key...

also what type of HU/processor are you running? if you are running something basic you may well find that upgrading this will give you a much better sound due to the more detailed tuning features... let us know what you have...

cheers, dan

[Mrk_Mickey]

Cheers dude, thought it might be that.

uhhh....Processor? Wtf? lol. Headunit....it's a basic kenwood thingo...however I don't see why it should be replaced if my more important tuning is from the driver (the amp)..I know what you're saying about the tuning capabilities of higher end stuff but doesn't it run through the amp's main tune anyway, thus the amp is the overriding/more powerful tune? Sorry if that's all whacked out and hard to understand

[glidn]

something else you should know is any car audio system is only as good as it's weakest link.

IE, you might find your Kenwood radio could only be producing around 2V output for the RCA outputs.

Now going to something like an Alpine CDA-9887, will net you 4V pre outs. Which will be a HUGE jump, and if you can find a high end model of an Eclipse head unit, you could see figures of around 8V pre out.

These little things make a huge difference to the way the system sounds.

Something else is that the Alpine CDA9887 also has a 24Bit Burr brown DAC (Digital Audio Converter) inbuilt, so if you use the CD player or IPOD it will convert it with the 24Bit DAC and again improve the sound tremendously.

Hope this helps.

I would also recommend playing your HP cross over down to around 70-100Hz
and see if that makes a difference.

On the sub also pull that down to 80-100Hz, unless you can pull it down to more of the likes of 60-70Hz.

But I do know the factory door locations in the 5dr mk3's are not the best by far. You can pull the speaker out and use silicon and seal the enclosure the speaker sits in. then use some heavier weight Dacron and fill it behind the speaker. Thus making the speaker sound like it's in a bigger enclosure and should give a substantial increase in the mid range.

I hope this all makes sense, if not let me know or PM me and I’ll be happy to help.

[Spec83]

Agreed with the above post... Your mids crossover is way to high (from what you have said about 180Hz) which will give you a complete lack of midbass..

I would try the following -

* Have the LPF for your sub set at about ~90Hz;
* Have the HPF for you splits set at about ~100Hz;

(the cutoff octaves (assumed 12db) will ensure that the mids and lows blend)

* Dacron fill your sub box to decrease resonance and give more of a warm feel to the sound,
* DON'T dacron fill doors as the fibre will hold water and thats bad;
* Sound deaden you doors using dynamat or similar as at these crossover points they will start to vibrate;
* Could deaden you hatch with dynamat too just to make sure... vibration is wasted sound energy;

There is also a trick to tuining your amp gains too... Turn the HU up to 80% volume with both gains turned all the way down, then turn the gains up untill distortion begins, then back off 1/8th of a turn...

If you think you need a new Head Umnit PM me as I have an Alpine sitting in the cupboard that I will let go for cheap

Good Luck

[glidn]

Spec83 - in this case yes you can indeed do dacron for front speakers.

Its a sealed door card, with a speaker mount onto pocket bolted on top of door card.

Mrk_Mickey - if you would like more info on what i mentioned, i'll take some photo's as i go along. As i've currently got myself a white 5dr vr6, so i'll be doing a show and tell (lol) on the build.

Unless i get some fancy new components that do not fit in factory pocket in which case i'll end up building something again.

[Mrk_Mickey]

Thanks guys, some great info there and much appreciated! When I have some spare time to muck around with the sound I'll see how the advice turns out, and Spec83 I'll get back to you on that alpine headunit offer

Cheers

P.S: Thanks for the info on all the DIY speaker improvement, but I probably won't go to this extent as I'm almost happy with the sound as it is . It definitely gets loud enough! I'd love to see your build and tell though

[Spec83]

Tuining your gains and filters will do wonders... Try that for a start.

As for dacron, I have seen some bad thing when put in doors plus with a mid-bass it won't have much of an effect... Spend the extra time/$$$ and Deaden the doors and you will see a marked improvement

[glidn]

Spec83 - normally i would fully agree with your statement in regards to the dacron fill in the doors. However the MK3 front midbass do not (I
REPEAT DO NOT) vent into the doors at all, which means the midbass have approx 1-2 litres of volume. therefore using the
dacron method you can fool the speaker into thinking it's in approx 3-4 litres of volume, therefore making them play lower and giving
"the warmer" feel to the sound.

[Spec83]

Ahh I see... I stand corrected

Must admit, I have never seen a car door without a penetration for a speaker (unless a speaker isn't meant to be there in the first place)... You learn something everyday!!!