Question for those of you that have experience with 15 inch subs...

themiz69 said:
SPL(output)---->Ported is King.
tuning has SOMETHING to do with how low a sub will play. a 10 will NEVER audibly go as low as a comparable 15 will no matter how u tune it of stuff it lol. notice i said audibly, and the reason for that is that it MAY be able to reproduce the frequency but we(humans) would not know it. fair enough?
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+1.
I cant believe he said The box has "Everything to do with how a sub performs" lol.. some people man. I swear. Anybody with common sense knows thats an untrue or half true statement. But Hey.. let him tell it i dont kno anything. Whatever. OP try the things i suggested and try the things he suggested.. ya kno the polyfill thing.. and see what works better. lol. im done.
 
Sorry for the slow response guys, busy day at work. The enclosure I am using is 2.18 CU FT. The sub has a range from 1.9 to 4.something. I realize that I am on the smaller end of box size. I put 3 pounds of poly fill in it, and it did not make much differance. I am using the left and right chanels of my amp to individually power each voice coil, so I am running at 2CH 2 OHM each. This overpowers the subs max power handling by 100W total at maximum output. The ported box volume was 3+ CU FT so I wanted to stay sealed. I also do realize that 2 12s that have greater surface area than the single 15 will move more air. I had high hopes that the kicker would be at least almost as good as the pair of $99 kenwood 12s I had. Some of you guys are talking about the 15 subs acting in a very specific frequency range and that sounds alot like my complaint. I listen to a mix of music, but mostly rock. Most rock music does not sound good, but when I tried some of the rap that I listen to (some) the thing sounds awesome. A friend of mine gave me a pair of these kicker 15s when he moved, so I am only out the price of the enclosure if I can't get this thing sounding right. I have always wanted a 15 though (dont know why exactly), so I hope I can get this right.
 
scjmc said:
Sorry for the slow response guys, busy day at work. The enclosure I am using is 2.18 CU FT. The sub has a range from 1.9 to 4.something. I realize that I am on the smaller end of box size. I put 3 pounds of poly fill in it, and it did not make much differance. I am using the left and right chanels of my amp to individually power each voice coil, so I am running at 2CH 2 OHM each. This overpowers the subs max power handling by 100W total at maximum output. The ported box volume was 3+ CU FT so I wanted to stay sealed. I also do realize that 2 12s that have greater surface area than the single 15 will move more air. I had high hopes that the kicker would be at least almost as good as the pair of $99 kenwood 12s I had. Some of you guys are talking about the 15 subs acting in a very specific frequency range and that sounds alot like my complaint. I listen to a mix of music, but mostly rock. Most rock music does not sound good, but when I tried some of the rap that I listen to (some) the thing sounds awesome. A friend of mine gave me a pair of these kicker 15s when he moved, so I am only out the price of the enclosure if I can't get this thing sounding right. I have always wanted a 15 though (dont know why exactly), so I hope I can get this right.
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Honestly... if u listen to alot of rock.. IMO 15's are def not the sub for u man {Unless u have the high end ones with alot of power on em} OR {u use a ported box} 10's or 12's will perform alot better. And i knew by how u described ur problem that polyfill wuld not help in this case. its a matter of freq at this point. Rock music with the guitars and drums are naturally at a higher freq than rap which is mostly kick drums and 808's. Ur looking for that punchy loud bass.. And thats exactly what 10's and 12's provide on a budget. 15's deliver deep thundering bass but its not alot of that type of bass in rock music. That explains why it hit hard on the rap tunes but sound crappy with the rock tunes.
 
StackZzz LS said:
Is it an epic centre? looks kinda like a telephone wire that u can mount inside the cabin of the car..
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No, looks like a headphone jack and says volume on it. And you can run it and mount it but I just do \/ that..

StackZzz LS said:
All that does is add distortion also.. Yes, it adds volume but it also distorts the signal.
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If I put it at 0, there is no signal going to the amp.. It's called an external volume control I think.. Nothing to do with bass boost, just how much of the signal that will go to the amp.. It's in the settings on the deck..
 
Thanks again for the responses. I do have a 1000W RMS amp in my beeter Jeep that I could use. How expensive a 15 inch sub would anyone recommend for my application that would work in a 2.18 cu ft box?
 
I have a california profile CL1200 (might be wrong on model). It is 150W RMS X2 @ 4OHM, and 300W RMS X2 @ 2OHM. The peak is double. My beater has a Profile CL2000 which is 250X2 4 Ohm RMS, 500X2 RMS 2 OHM. I can move the amps and speakers around as needed, but my Lincoln is most important. The best sounding system I have ever had is in my beater (1993 200K+ miles Jeep Grand Cherokee) 2X12 Infinity Kappa Aluminum cone subs and that CL2000. The problem is that the speaker box is huge--way to big for the trunk of the Lincoln.
 
scjmc said:
thanks again for the responses. I do have a 1000w rms amp in my beeter jeep that i could use. How expensive a 15 inch sub would anyone recommend for my application that would work in a 2.18 cu ft box?
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Db Drive PL15
 
scjmc said:
I have a california profile CL1200 (might be wrong on model). It is 150W RMS X2 @ 4OHM, and 300W RMS X2 @ 2OHM. The peak is double. My beater has a Profile CL2000 which is 250X2 4 Ohm RMS, 500X2 RMS 2 OHM. I can move the amps and speakers around as needed, but my Lincoln is most important. The best sounding system I have ever had is in my beater (1993 200K+ miles Jeep Grand Cherokee) 2X12 Infinity Kappa Aluminum cone subs and that CL2000. The problem is that the speaker box is huge--way to big for the trunk of the Lincoln.
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what are the fuse ratings on these amps.. and how many.
 
FASTLLS said:
No, looks like a headphone jack and says volume on it. And you can run it and mount it but I just do \/ that..

ok.. thats not an epicenter

If I put it at 0, there is no signal going to the amp.. It's called an external volume control I think.. Nothing to do with bass boost, just how much of the signal that will go to the amp.. It's in the settings on the deck..
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That makes sense because If its at 0 then its basically the same signal that was already goin to the amp. Its still a flat signal. Try it on -3 and bring the amp up to compensate.. I bet you'll hear a cleaner sound. The cleaner the signal the louder and cleaner the bass will be. Most ppl dont know this but its a proven fact that when ppl blow their subs its most likely from distortion. Not from over powering them. :cool:
 
StackZzz LS said:
If you wuld have taken the time to read his post you wuldve read that he stated that his subs only hit hard in the lower freq and he is using the correct box volume size. And sub size has alot to do with how well they hit individual frequency's. The larger the sub the more air it will move so obviously 15's will hit alot stronger in the bottom frequency's than a set of 10's for example. and let me be clear.. im NOT sayin the 10's wont hit the same freq.. im saying they wont be able to hit it as hard. and ur also wrong about rap music mostly being in the 30 - 50 hz range.. its more like 60-125. And also.. i NEVER stated they wuldnt be fine in a sealed box. I said They Perform BETTER in a ported box imo. So Dont try and pull my card when u didnt even read the :q:q:q:qing question and responses. Hell what would i kno.. i only been installing the :q:q:q:q for over 10 ys.. And why do i have the feeling that you and shadez is the same damn person.. o well. Ur both Wrong. Putting polyfill in his damn box will not solve his problem. And to think u started ur "Reply" with "So much misinformation" wow.

Honestly... if u listen to alot of rock.. IMO 15's are def not the sub for u man {Unless u have the high end ones with alot of power on em} OR {u use a ported box}
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There's no reason to get this upset? And no, I am not OBI, I have been a well respected member of the original LOD for 10 years, i don't hide behind fake names.

Saying a 15" is bad for rock is simply not true, and if anything using a ported box for rock music would be a bad move. Ported boxes can sound louder because it maximizes efficiency over a narrow range, and this range is generally lower than a kickbass drum in rock plays. Sealed boxes tend to have a broader more even range. Those CompVR's should not have any problem playing rock music, provided the rock is a good quality recording (I know chevelle sounds great with some subs!)

I will give you this, polyfill would not help his case much. I don't think he is having a problem with standing waves, which is what polyfill is supposed to correct.

From your original post, the only thing changing between the good sounding 12's and the bad sounding 15 is the subs themselves, so we can rule out amp issues. Knowing now that these subs are used, are you sure they are in perfect condition? If so, before spending money on new subs, spend the $20 in wood and try building a larger box. If a 3.5 cube box still isn't giving you the sound you like, then we can look at other more expensive options such as a new sub
 
Could your system be bridged and then run the VC in series.. Idk if that would make a difference.. I'm not an audio guy.. I mean I could probably figure it out but us lineman are lazy.. :lol: ;)
 
MaddShadez said:
There's no reason to get this upset? And no, I am not OBI, I have been a well respected member of the original LOD for 10 years, i don't hide behind fake names.
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Ok Cool.

Saying a 15" is bad for rock is simply not true,

IMO Its Not.

and if anything using a ported box for rock music would be a bad move.

Again.. IMO Its Not

Ported boxes can sound louder because it maximizes efficiency over a narrow range,

Incorrect.. They dont just sound louder they are louder

Sealed boxes tend to have a broader more even range.

I agree.. thats why i suggested a ported box.

Those CompVR's should not have any problem playing rock music, provided the rock is a good quality recording (I know chevelle sounds great with some subs!)

+1

I will give you this, polyfill would not help his case much. I don't think he is having a problem with standing waves, which is what polyfill is supposed to correct.

Thank You.
 
scjmc said:
I am using the left and right chanels of my amp to individually power each voice coil, so I am running at 2CH 2 OHM each. This overpowers the subs max power handling by 100W total at maximum output.
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There is your problem right there. DO NOT power a DVC sub with two separate channels of an amp. Bridge the amp to a single channel and wire the sub's coils in series for a 4ohm load. You will be find on your power rating with that Kicker.

Also, as mentioned previously, check your crossover level. For a 15 I would set it about 80-120 hz for maximum performance. Don't be shy with the level...
 
StackZzz LS said:
what are the fuse ratings on these amps.. and how many.
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I am running from memory but I think the 1200 is 2X20 amp blade and the 2000 is 4X20. They might be 25 amp, but I cant remember. I also cannot be sure that the sub is in perceft working condition because I got it used. I have the other one of the pair and I will try that this weekend.
 
FASTLLS said:
Could your system be bridged and then run the VC in series.. Idk if that would make a difference.. I'm not an audio guy.. I mean I could probably figure it out but us lineman are lazy.. :lol: ;)
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n8bachelor said:
There is your problem right there. DO NOT power a DVC sub with two separate channels of an amp. Bridge the amp to a single channel and wire the sub's coils in series for a 4ohm load. You will be find on your power rating with that Kicker.
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Didn't I just say that?! :D
 
n8bachelor said:
There is your problem right there. DO NOT power a DVC sub with two separate channels of an amp. Bridge the amp to a single channel and wire the sub's coils in series for a 4ohm load. You will be find on your power rating with that Kicker.

Also, as mentioned previously, check your crossover level. For a 15 I would set it about 80-120 hz for maximum performance. Don't be shy with the level...
Click to expand...

I will try that. Why is this a problem? I am asking because I do not know. I have a Rockford comp 10 in my mustang that I always had a similar problem with (long ago) and I wired it the same way. Maybe thats my problem. Each channel does use the same exact input. My deck's sub output is mono and I am using a mono to dual RCA adaptor. Please tell me that I am making some DVC rookie mistake.
 
I was about to say maybe its not wired down correctly.

wrong impedance and it will sound like doo doo.
 
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