NA Car audio options

Body, Paint, Interior and Trim questions and answers

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Brad
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Re:

Postby Brad » Wed Oct 18, 2006 10:06 am

Astroboysoup wrote:yes agreed,

my other option is to make a MDF parcel shelf and install another set of splits on there. I already have the holes in the parcel shelf and the roll cage will still have enough room if they're 6" woofers. Can't think of a good place for the rear tweeters though.


Try running the splits with just the midrange drive on fullrange, ie no crossover. The 6" will have a natural rolloff in the upper frenquencies similar to the response of our ears to high frequencies coming from behind us. It will also prevent the sound stage being dragged to the rear. Rear fill is exactly that, fill.
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Re:

Postby marcusus » Wed Oct 18, 2006 7:47 pm

Brad wrote:6x9's actually need a very large box to work properly in the lower end, though if you are just after mid range they would be fine. Good alternate to cutting the parcel shelf, though being stuck down behind the seat won't do much for sound volume or frequencies above about 3khz...which is the top end of midrange anyway.

Isn't the whole point of 6x9's to take up that midrange where the sub and fronts can't go in terms of frequency?

So still no answers as to how to get some holes cut behind the seats? Anyone done it before?

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Re:

Postby Brad » Wed Oct 18, 2006 7:55 pm

marcusus wrote:
Brad wrote:6x9's actually need a very large box to work properly in the lower end, though if you are just after mid range they would be fine. Good alternate to cutting the parcel shelf, though being stuck down behind the seat won't do much for sound volume or frequencies above about 3khz...which is the top end of midrange anyway.

Isn't the whole point of 6x9's to take up that midrange where the sub and fronts can't go in terms of frequency?

So still no answers as to how to get some holes cut behind the seats? Anyone done it before?


Well there's the inherent problem with 6x9's. You'll rarely find a decent well thought through system with 6x9's as they do high sensitivities to midrange (ie comparatively louder), which in effect pulls the whole sound to the rear of the car. When was the last time you went to a concert and stood with your back to the stage? Music is meant to originate from in front of the listener, with rear fill provided by speakers with substantially less power output.

In a car environment, the goal is to provide an even spectrum of midbass-high frequencies (80-20,000hz) from the front, with the sub in the rear (<80hz) with rear fill provided in the back in the range of 80-4,000hz with 6-12db (about half to quarter) of the SPL of the front. For example if I was powering the front splits with a 100wRMS/channel amp I'd probably run 6x9's off 20wRMS, or even the headunit. Even then it would need a whole lot of tuning to get the balance right.
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Postby marcusus » Wed Oct 18, 2006 8:47 pm

^^^
Yeah, but that's the problem with car audio. It's probably never going to be absolutely perfect, so it's always going to be a compromise.

But anyway, not really the point of this thread :P

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Re:

Postby Brad » Wed Oct 18, 2006 10:29 pm

marcusus wrote:^^^
Yeah, but that's the problem with car audio. It's probably never going to be absolutely perfect, so it's always going to be a compromise.

But anyway, not really the point of this thread :P


That's the interest for me, trying to come up with novel solutions for a pretty compromised situation.
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Postby marcusus » Wed Oct 18, 2006 10:37 pm

^^^
If I had more time, I'd definitely do it. Also, I'm lazy :P

Actually, in reality, the real reason is that I'm just too lazy to bother getting at it with full frequency sweeps etc etc. It wouldn't be hard either. I could bum all the test equipment from work. The only problem would be actually buying the system and installing it :P

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Postby Brad » Wed Oct 18, 2006 11:14 pm

Lisewise, I spent many a hour when I should of been at uni working different systems out. Now I don't even have a sub. Just a set of 6\" JL splits on an old Pioneer amp.
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Postby jules » Thu Oct 19, 2006 11:20 am

I had a BRG for a week with Boston Accoustic door speakers (no splits) being run by an unknown amp and a Sony double din headunit. It sounded friggen beautiful.

There was no apparent sound deadening, or extra work other than sticking them in the doors.

I have often wondered if it was the speakers or something else. Does anyone have an opinion on Boston Accoustic?


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Postby Brad » Thu Oct 19, 2006 11:28 am

Boston make some of the best 'accessible' car audio speakers. They have a very smooth sound, much like an MB Quart.
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Postby kula » Thu Oct 19, 2006 12:45 pm

yup.

i have some old boston rally 6.5 2 ways in my mx5 now, it sounds decent.

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Postby jules » Thu Oct 19, 2006 12:54 pm

Decent?...decent....well that will get me jumpng out of my chair to get a set.

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Re:

Postby JBT » Thu Oct 19, 2006 2:58 pm

Brad wrote:Now I don't even have a sub. Just a set of 6" JL splits on an old Pioneer amp.

I don't even have an amp. Just a pair of 6" JL splits and a Blaupunkt head unit. :|
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Postby jules » Thu Oct 19, 2006 3:28 pm

I guess sound in the MX-5 is not usually a huge priority. If it rains and the top is up. I notice it. With the top down, I don't usually listen to much.

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Postby Benny » Thu Oct 19, 2006 5:53 pm

If you want to hear good sound in an MX-5, you should have a listen to my system.
Doesn't look anything flash (which is what I wanted), but the sound quality is sensational and I can still hear it, top down at 160km/h.

I've got a cheapie JVC head unit with a USB port, running some Italian made amp which just happens to fit perfectly where I want it, and I'm running an 8\" sub in a custom box in the boot and Focal splits in the doors.

Next time you see me, ask me for a demo.
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Postby jules » Thu Oct 19, 2006 6:05 pm

I've seen your sub. The install is sublime. Is the sound on par with the Benz?

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