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Old 01-15-2003, 01:03 AM   #1
ants wrx
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Member#: 17885
Join Date: Apr 2002
Chapter/Region: Tri-State
Location: Kearny, NJ
Vehicle:
2006 Scion xB
93 RB25det powered 240sx

Default i need some help building my system (what to get etc)

hey guys thanks for taking time to read my thread..

these are my plans so far....

i think i have my heart set on infinity kappa 63.5's for the front, unless someone thinks they are bad?

for the rear speakers.. i am thinking about ditching the door speakers and custom installing some 6x9's on the rear shelf. (at first i wanted to put 2 subs there but i realized the shelf is too narrow for those) should i go with infinity 6x9's as well? maybe some suggestions if otherwise?

for subs in the trunk... i was thinking either 2 JL 12W6's or 1 Resonant engineering 12" sub in the trunk... any comments on those? im looking for good all around base..i listen to everything and i like it loud and clear (not overwhelming bass and no music but a good mix of both) so how are my choices for subs for this application? also what does it mean to run at different ohms? i dont get that stuff..

for amps & head unit... i simply have no idea. this is where i need most of the help. i need some suggestions of a good all around HU. gotta be either 350 or below. doesnt have to be a fancy bling bling face because im more concerned with feature and quality. i hear alpine HU's are good for that.

amps...? i dont know whats good and whats not..what amps should i use for front/rear speakers and the sub(s). i dont know how the specs on amps work but the front speakers are 75watts RMS so i'm assuming i need an amp that powers 75x2? and if the rear speakers were the same it would be 75x4? is that correct? are amps that power subs different than amps that power speakers? what amp should i use for the sub(s)?

if you read all that, thanks..lol
if you can respond and help me out..thanks even more

Anthony
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Old 01-15-2003, 03:20 PM   #2
1quiksoob
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infinity kappa's are awesome speakers as long as you can fit them in the doors. Our cars don't allow for a whole lot of depth in the factory location. As far as hu's are concerned, alpine would be the way to go. The cda7894 is gonna be 400 new at a retail store. You may be able to find it cheaper somewhere on here. It's a great deck, three 4-volt preouts, sub control, mp3 capability, motorized face, 60wx4, and tons of tuning controls!
As far as amps are concerned, I have always used MTX amps, they are powerful and clean, a perfect blend. I actually have a few for sale right now inthe members classified if you want to check them out. The ones you would probably want are the thunder6304, to power your highs, and the thunder6500d, to power your subs. They are pretty much brand new, used for about a week and then been sitting in my room for about 3 months, they still carry the manufacturers warrenty. Check them out on that forum, and if you have any question, give me a pm, and I'll see if I cant help you out.
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Old 01-15-2003, 04:00 PM   #3
ruiner
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I've been in/around audio for nearly 10 years now, these are my recommendations:

BTW, you didn't mention if you had a budget, so there are 2 routes you could go, here's the more expensive but good one:

If you have your heart set on rear fill, then the 6x9's might solve your issue. Make sure you shield them from the trunk so that you don't interfere with their cone movement from your subwoofers. The force of the subs could negatively affect the 6x9's. I personally don't like having rear speakers in the car. Who wants music coming from behind them anyway? Not to mention it messes up your imaging.

If you do go with rear speakers, JL audio makes a fantastic amp called the 300/4. I personally own one and love it.

As far as your subs, are you talking about the W6V2 or the W6V1 subs? I hear the W6V2's are great for the price, but certainly not top of the line these days.

If you want something inexpensive and only want to buy one amp for your entire system, JL audio also makes a very nice amp called the 500/5 which would be the money saving direction. That will give you a channel for your sub(s) and 4 other channels for your fronts/rears.

Any other questions, feel free to ask.

Chad
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Old 01-15-2003, 04:06 PM   #4
ants wrx
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93 RB25det powered 240sx

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1quiksoob, thanks for your response. i will be making spacers to fit the kappas in the doors.

about the amps..what are the RMS specs on those amps you have for sale? would you be willing to go lower on your prices too? it looks like they can be had for quite a bit less on ebay, even brand new

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Old 01-15-2003, 04:30 PM   #5
ants wrx
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ruiner, thanks also for your response.

but i'm having trouble fully understanding this stuff... ok this 500/5 amp looks like it would work good in my situation...BUT..

the specs on this are:
Front Channels: 100 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)
Rear Channels: 25 W RMS x 2 @ 1.5 ohm-4 ohm (11V-14.5V)
Subwoofer Channel: 250 W RMS @ 1.5 ohm-4 ohm (11V-14.5V)

now.. if i go with my infinitys in the front, they are 75watts RMS...this amp puts 100watts RMS. so will these speakers blow?
also, won't only 25W RMS going to the back underpower a set of speakers that are about ~75-90W rms? same thing with the sub..the R.E. sub i want is 600W rms i believe...will 250W rms be underpoweing it and not sound good? (same thing with the JL 12w6's v2) but i think those are 300w rms each

also, is the power from the head unit added onto the power of the amp? meaning... say the HU puts out 25W rms and i have the amp(500/5) with 100W rms...does this equal 125W going to the front speakers (consequently 50w to the rear)?


thanks for the help guys
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Old 01-15-2003, 05:15 PM   #6
ruiner
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You are pretty new huh? That's ok, let me help clarify a little bit. First of all, when using amps you will not be using your headunit's power at all, so no do not add wattages. Also, yes the 100x2 is quite powerful for your fronts, but you can always turn the gain down and make sure that the kappas don't get overpowered. I personally am not a big fan of the kappas and would recommend something slightly higher in quality. Do you have a budget in mind for your entire system, or are you doing what I did and doing it in parts, so you can spend what you want?

As far as 25 watts RMS underpowering a speaker, I really don't think so. Typically when a manufacturer rates a speaker's RMS wattage, they give you the MAXIMUM you can put to that speaker.

As far as your subs go, not every manufacturer will list what power rangers are recommended for each particular sub. JL audio has a very nice chart for all of their subs here . I'd suggest checking it out.

You might want to start off small and try out one JL W6V2, as the recommended power range for that subwoofer is about 150W RMS - 450W RMS. Anything in that range should work well, with the optimum being 300-375W RMS. Of course that chart is not 100% accurate but is a good starting place.

Also, you would only want one sub because if you put 2 on there, then you're looking at half the power for each driver.

If this route doesn't sound like what you're looking for, and you'd rather do multiple amps, then the 300/4 would be great for the speakers you've already selected and you can put 75w RMS to all 4 channels, and get yourself a JL Audio 500/1 amp for the R.E. driver and put 500W RMS to it. Just because it says it can take 600, does not mean you need that much to make it sound good.

Whatever you do, any of this gear will sound very good to your ears, as it sounds like you are new to car audio. Less expensive routes can be nice, especially if you haven't heard more expensive setups.

Chad
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Old 01-15-2003, 05:21 PM   #7
1quiksoob
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2004 STi
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the prices are definitly negiotiable on the amps for sale. As for the specs, I am not exactly sure about rms, I do however know the peak. For the four channel it is 125 per channel, which in rms probably equates to around 75 watts or so per channel, not to bad at all for rms. As for the sub amp, peak is rated at 775w. rms probably around 450 or so. The thing you have to remember about mtx amps is they are usually underrated from the manufacturer. They typically put out about 15% more than the rating. So you can pretty much add 15% to the numbers I gave you.
As for a couple of your other questions, underpowering a speaker can be just as bad as overpowering it. All amps will come with gain controls so you can always turn the power down a notch or two if need be. No, you don't add the headunits power to the power of the amp. Once you hook up an amp to a speaker, that amp is the only power supply going to it. You are bypassing the power of the hu. Hope this helps you a little, and if you are interested in those amps, make me an offer, like I said I need to get rid of them to free up some cash flow, so no reasonable offer will be refused.
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Old 01-15-2003, 07:12 PM   #8
02bump'nWRX
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For amps i suggest concept, I have 2 in my car and they rock. I also have sold many to friends and they all love them. They are failr new and little knowen but their quality is awsome and they sound great. Check them out a www.conceptconcept.com
I suggest a cc504A 50WX4 for you speaker. And a ccd800A class d 800watt mono amp for your subs. As for subs i personally don't like JL but they are ok. If you're looking for sq then check out eclipse. Eclipse also makes nice headunits, some of the best in the world. For speaker i used orion cobalt speaker they are cheap less than $100 per pair!!! and they sound awsome too. But if you want to spend the big bucks get mb quarts or the high end orions, or focal,m or eclipse. All these products i can get them for dealer cost if your interested pm me and i;ll get you a price. But aside from that i wouldn't buy and other amp then concept.
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Old 01-16-2003, 12:25 AM   #9
jerome02rs
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I thought about my system for a long time too- I wanted really good sound quality for a reasonable cash outlay.
I ended up with the Alpine CDA-7894 head unit- does everything I need including MP3, looks nice, good quality sound and decent price.
Front speakers are MB Quart RSC216 components- I listened to a lot of speakers and again these were pretty tough to beat for about $180.00- they install easily in the front doors with a 7/8" spacer.
Sub is a Crystal CSe 10.4- this sub has received great reviews and I bought it for $60.00! It's mounted in a custom fiberglass enclosure in the spare tire so I don't lose my trunk space.
The amp is a JBL p80.4 - again I have yet to read a bad review on any of the JBL amps and for the price (under $130) they can't be beat.
The amp powers the front speakers and the other two channels are bridged to drive the sub- the rear spekers are stock for now (driven by the head unit) and to be honest they are faded down and are so overpowered by the rest of the system that they are almost inconsequential.
I have sound deadening material on the way (brown bread) but right now the system sounds phenomenal- I'm very happy with how it turned out.
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