sub/amp
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=23953
Printed Date: July 13, 2025 at 6:32 PM
Topic: sub/amp
Posted By: gregfocker77521
Subject: sub/amp
Date Posted: January 05, 2004 at 1:27 AM
Will one 12 inch L7 dual 2 ohm sub wired at 1 ohm handle a memphis 1000d at 1 ohm? The amp puts out 1100 watts at 1 ohm. Sub is rated at 750 watts rms.
Replies:
Posted By: CharlzO
Date Posted: January 27, 2004 at 1:44 PM
As long as you're careful, and don't abuse it, it should hold up alright.
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I had bad credit. Anyone have any they can loan me? lol
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 5:53 PM
I agree. You're right at the halfway point between RMS and Peak (you really don't want to go any higher). And unless you've already beefed up your alternator, chances are you wont get the full 1100 from the amp anyway. So yes, as long as you tune the gains properly then you should be safe. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: forbidden
Date Posted: January 27, 2004 at 6:58 PM
The power handling is also going to be dependent on the size of the sub box, give us some info on that as well.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 7:06 PM
Thanks guys but a little too late!!! I blew out two Kickers L7's Dual 4ohms with the Memphis 1000. I had them in 1.25 box for each sub. I had each speaker wired at 2 ohms which in turn gave me a 1 ohm for the amp purposes. By the way I do have an 150 amp alternator in my car. But why I the speakers are 750 watts rms and I was only putting 550 watts to each sub?
Posted By: customsuburb
Date Posted: January 27, 2004 at 7:14 PM
RMS power handling can be measured in many ways and some arnt that accurate. Look at DYohn's post about power handling. And if your looking for replacement subs go with JL's 12" W7s. I think they're better then the Kickers if you can afford them. Here is the link to dyohns post: https://www.the12volt.com/installbay/forum_posts.asp?tid=25066&PN=4
Posted By: customsuburb
Date Posted: January 27, 2004 at 7:15 PM
Also a speakers power handling will go down about 100 watts if its in a ported enclosure.
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 7:21 PM
It was a sealed box.............How about 12'' eclipse titaniums vs JL W7's? I can buy the eclipses for about $100 less for each sub.
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 7:23 PM
It was a sealed box...............How about 12'' titanium eclipse subs vs JL W7's? I can get the eclipse for $100 less for each sub.
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 7:30 PM
If you blew 2 L7's with an 1100 watt amp then you did something wrong. Those subs should not have blown. Did you get them from an authorized retailer or off of eBay?
If you can get them Authorized go Eclipse. I'm running (2) RF Punch HX2's right now powered by an RF Power 1000bd, but am saving for (2) Eclipse Titaniums and a second Power 1000bd. The Titaniums ROCK! But make sure to have a thick enough box, as they tend to pull themselves out! Use a minimum of 3/4" MDF, and a Gross volume of around 1.25 cu.ft. Double up on the front baffel (mounting surface) to be safe, and use GOOD SCREWS!
If you buy authorized, the Titaniums run around $800 a piece. They're Dual 4ohm DVC's, 750RMS 1500 Peak. Eclipse 12" Titaniums------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: forbidden
Date Posted: January 27, 2004 at 7:36 PM
I happen to agree with squirrel's findings. I have had numerous Eclipse speakers rip out of 3/4" mdf. I also agree that if you blew to L7 subs there is something seriously wrong, be it an overstated capability of the sub or abuse of the system. What kind of cd player are you using and what is it's output voltage? Buy from an authorized dealer, use the system properly and you will not look back, these subs are one of the best sounding subs on the market today that play deep bass with authority.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 7:41 PM
This place here which im sure that they are authorized quoted me $499 each. You mean 1.25 gross for each or both??? What could I have done wrong? I had received them in a trade for some weight lifting equipment. i checked them and they where good. Actually they still work but on the inside on the sub the yellow accordion looking thing is torn.
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 7:51 PM
You got used subs in a trade (that's what you did wrong). They could have been abused before you got them, and that propably led to them blowing. And the Accordian looking thing is called the Voice Coil Former. If that's ripped you're subs are toast.
1.25 gross per chamber of a sealed enclosure. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: forbidden
Date Posted: January 27, 2004 at 7:54 PM
The box volume is 1.25 cu.ft. gross per speaker. Make the box with two separate chambers. Call around for a better price on the Titanium subs from authorized dealers within roadtrip distance. The yellow accordian thing is called a spider, it is there to keep the voice coil former centered in the magnetic gap as the cone travels up and down. If the sub is asked to do something it was not designed to do, in this case play a clipped signal (the amp ran out of clean power and produced distorted power for lask of better words). This causes a loss of control of the motion of the driver, in other words you accordian was pulled to far and ripped. This is usually due to exceesive gain on the amp, it is not a volume control, it is designed to match the ouput of a head unit to the input of an amp and ideally should be kept as low as possible.
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Top Secret, I can tell you but then my wife will kill me.
Posted By: forbidden
Date Posted: January 27, 2004 at 7:55 PM
What cd player are you using?
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Top Secret, I can tell you but then my wife will kill me.
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 7:55 PM
You matched the RMS correctly, and from the sounds of it you had them wired correctly too. So don't beat yourself up too bad, you just took a chance on used subs.
Buy the Eclipse's new and from an Authorized dealer. Get the extended warrenty, build your box correctly, and you will be thrilled with the performance.
BTW, if you only have a 150amp alternator, you might consider getting a High Output alternator too (those Titaniums are power hungry!) ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 7:58 PM
I agree with Forbidden about the gains. Where did you have them set? ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 8:16 PM
And Forbidden is right about the Spider. I looked at the wrong link on the diagram when I said the VC Former. Sorry about that ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: customsuburb
Date Posted: January 27, 2004 at 8:28 PM
Go for the JL subs ,and buy from an authorized dealer like everyone else is saying!!
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 8:43 PM
Why would you recommend JL 12W7's over Eclipse SW9122's? The 12W7's have a 1.15" Xmax (one way), while the SW9122's have a 1.5" Xmax (one way). The Eclipse's have a longer throw, and will push more air. Not to mention the SQ/SPL mix of the Titaniums is unreal!
I know it's all personal preference, but I think you would be happier with the Eclipse Titaniums. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 8:50 PM
I was using a pioneer 8400 cd player. the stock alternator was a 102 amp and I upgraded to a 150 amp. Hey I have a planet audio amp P225hc that I'm considering wether to sell or not. How much you guys think I can get for it????
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 8:53 PM
Are the speakers still repairable or might as well throw in trash????
Posted By: customsuburb
Date Posted: January 27, 2004 at 9:10 PM
Just cause a sub has higher x max dosnt mean it sounds better. You are right though if he likes the Eclipses then he should buy them.
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 9:29 PM
The subs are trash. If you had bought them authorized you would have had a warranty and could have gotten them replaced.
Customsuburb, I realize that just x-max doesn't make it sound better, in fact I believe it has more to do with SPL than SQ. The Titaniums are high end SQ subs with tremendous SPL as well.
Just a side note on the Titaniums, the magnet is detachable. I believe you can remove it and send just the basket back to Eclipse for repairs/replacement. And if it's out of warranty, I also believe you can get replacement baskets for less then the entire sub. Just a thought. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: gregfocker77521
Date Posted: January 27, 2004 at 9:38 PM
Hey I think the guy I traded with still has the warranty papers and receipts. How much you think it would cost to repair - send back????
Posted By: wvsquirrel
Date Posted: January 27, 2004 at 9:46 PM
Not sure, but here's Kicker's Customer Service warranty dept. info
Email KICKER Customer Service for Warranty help at warranty@kicker.com
Phone KICKER Customer Service - 405.624.8510 (M-F 8am-5pm Central Time)
Drop them a line and they'd be able to tell you. Although most warranties only cover manufacturer defects, not damage to to use/abuse. Destroying 2 spiders is usually a sign of overdriving the subs (like Forbidden said, you probably had the gains set too high and caused the amp to clip). But what the hell, it never hurts to ask anyway! ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
Posted By: maxxxaudio
Date Posted: January 27, 2004 at 11:11 PM
distortion kills woofers not power
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big dave
Posted By: wvsquirrel
Date Posted: January 28, 2004 at 12:39 AM
overdriving an amp can cause clipping, which causes a distorted signal, which destroys the sub. So you're right that distortion destroys subs, but you have to look at what caused the distortion in the first place. ------------- Squirrel
"No more Cpt. Kirk chit chat"
If its too loud, then you're too old
Donate to the12volt.com
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