experienced professional audio advice?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=103734
Printed Date: May 13, 2024 at 11:32 PM
Topic: experienced professional audio advice?
Posted By: mrfreddyfenkell
Subject: experienced professional audio advice?
Date Posted: April 05, 2008 at 9:06 AM
In my system I have a 240 amp alternator and I used Sparkys’ chart https://www.datafilehost.com/download.php?file=6d26c621 and it says that I only can allow up to 1915 watts in my system. When my system is at full power I have over 2300 watts. That is with my two 4 channels running. I have a Kicker ZX1500.1 that is rated at 1600 watt rms @ 2 ohm. I wanted to put two 15” L7’s subs in but when it comes to the box I have a problem. One place told me they can build a sealed box that can be removed. The other said they can build a ported box inside my trunk that would be permanent. I want a box built to the maximum size ported (6 cubic feet) so I can get full output of my subs. I was told that I don’t have enough room for both subs. I drive a 1992 Buick Roadmaster. So I was thinking about just using one sub with the big box that can be removed. I have the option of 2ohm dvc and 4 ohm dvc and my amp is 2 ohm stable. The subs are recommended 750 watts rms in the ported box and 1000 watts sealed. And I want all the spl I can get. But I don’t want my can not to start either. Pro’s what do you think I should do. ------------- i love to bang the beats all day
Replies:
Posted By: Alpine Guy
Date Posted: April 05, 2008 at 9:22 AM
Sounds like your going for some SPL? If thats the case, the sealed box with the Kickers is a bad idea, you are going to want to either run a single 15" in the proper ported box, I can assure you, it will hurt. But if you want another option that will be a just a little bit louder would be two 12" L7's in their proper ported box.
You are in luck by coming to this forum, there is a SPL world record holder on here using the L7's, hopefully Jeff can chime in as he has the most experience with these woofers.
As for the power question, you should be fine, music is very dynamic, it's very very rare that all your amps will be at their full rated output at the same time to cause your alternator to be over loaded. Be sure to do the big 3 wire upgrade to 0/1 awg wire.
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2003 Chevy Avalanche,Eclipse CD7000,Morel Elate 5,Adire Extremis,Alpine PDX-4.150, 15" TC-3000, 2 Alpine PDX-1.1000, 470Amp HO Alt.
Posted By: mrfreddyfenkell
Date Posted: April 05, 2008 at 9:42 AM
i already have two 15"L7's 2 ohm DVC and one 15"L7 4 ohm DVC. i was thinking i could use a 2 ohm in a series and get the 800 watts for everyday use and use the 4 ohm in a parallel and get the full 1600 watts when i want to show off just swap the sub. i just dont know how practical that would be.
------------- i love to bang the beats all day
Posted By: mrfreddyfenkell
Date Posted: April 05, 2008 at 8:27 PM
Thanks you made a few points I did not think of. I’m not really worried about the voltage because I have an external regulator on my alternator and it runs at 15 volts and my two SX700.4 (digital amps which pull a nice amount of power) reads about 14.8 – 14.9 in the trunk. But that drops if my sub level control goes over ¼ with the mono amp on a two ohm load. I usually don’t have the sub level passed that anyway because it does get hard to listen to music like that all the time. I just want the option to be able to crank it up. My main concern is power and not over working my alternator. Thanks, I think I might go with a single sub in about a 3-4 cubic foot box ported running at 4 ohms because it is a daily driver and use T nuts just in case I want to swap the sub which would be rare. I also noticed that my alternator does not put out 240 amps at 5000 RPM (idle) to just under 7000 RPM which is my normal driving RPM cruising.
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i love to bang the beats all day
Posted By: i am an idiot
Date Posted: April 05, 2008 at 9:49 PM
Use the Dual 4 ohm speaker and wire up these 2 relays. The amp will see an 8 ohm load untill you flip the switch then it will be 2 ohm. Much easier than switching woofers. | Switching from Series to Parallel and Back | When the relays are at rest (normally closed position) the woofer coils are wired in series. When ground is applied to each coil (energizing the relay coils), the voice coils are wired in parallel. With 2 four ohm voice coils you'll have an 8 ohm load at rest and a 2 ohm load when the relay coils are energized.
For each dual voice coil woofer that you want to change from series to parallel, you'll need two relays for each. They can all be controlled from the same switch.
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Posted By: mrfreddyfenkell
Date Posted: April 05, 2008 at 9:52 PM
now that is Toooooo sweet thanks i will do that
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i love to bang the beats all day
Posted By: boogeyman
Date Posted: April 06, 2008 at 7:27 AM
mr freddy remember to turn off your radio whenswitching from series to parallel
Posted By: i am an idiot
Date Posted: April 06, 2008 at 8:36 AM
You do not need to turn your radio off when using this setup. Even if you switch one relay at a time you will not hurt anything. If when turning it on and off it makes a pop in your audio system, simply add a diode across the coil of one of the relays. The band of the diode needs to be connected to the positive wire.
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