help please

[EPanther99]

ok i am going to get a vented box and i was wondering if this box looked good size wise for a 12" L7 i want to order it but i just wanted to see if anyone thought it may not be a good size to use, thanks
John

http://cgi.aol.ebay.com/ws/eBayISAPI...category=14945

[violator5spd]

It looks fine to me...but I wonder what it's tuned to?

[EPanther99]

Originally posted by violator5spd
It looks fine to me...but I wonder what it's tuned to?

im not sure, what does the different tuning freq. do to the sound of the sub? i havent had a ported/vented box in like 7 or 8 years my last one was a ported box with 2 12" MTX terminators so i never really messed with them before....

[violator5spd]

In general, the lower the tuning frequency then the deeper that bass, and the higher the frequency, the more "boomy" it will sound. I'd bet it's tuned between 36 & 40hz, which isn't bad for an L7.

[Randy Savage]

well, in general, a higher tuning will yield higher SPL levels at it's peak, but will leave you with a peaky response and not too good of low end extention....

When tuning lower, you will have a flatter response, but you will lose that high peak...

Basically, lower tuning (IMO 25-33 hz) will yield nice SQ, and 34+ will yield higher SPL levels (this is just a general idea of frequency ranges).

[EPanther99]

i just emailed the company and asked what it was tuned at, accroding to kicker the L7 is supposed to be a lot louder in a vented encloser then in a sealed box, they also reccomend using a 25hz sub soinc filter to increase the power handling so i proabably wouldnt want to tune it at liek 25-30hz bc it seams liek it would take a way a lot of the output, i guess also if i dont liek the sound of it in that box i can always get a sealed box for it, thats what i had my 15" L7s in and they sounded good.

[Randy Savage]

Originally posted by EPanther99
i just emailed the company and asked what it was tuned at, accroding to kicker the L7 is supposed to be a lot louder in a vented encloser then in a sealed box, they also reccomend using a 25hz sub soinc filter to increase the power handling so i proabably wouldnt want to tune it at liek 25-30hz bc it seams liek it would take a way a lot of the output, i guess also if i dont liek the sound of it in that box i can always get a sealed box for it, thats what i had my 15" L7s in and they sounded good.

a sub sonic filter won't increase anything, it will just protect the driver from killing it's suspension at frequencies under the tuning...

[EPanther99]

Originally posted by snova031
a sub sonic filter won't increase anything, it will just protect the driver from killing it's suspension at frequencies under the tuning...

well an L7 can handle 750 rms but in a vented encloser without a subsonic filter it can only handle 400 rms....

"recommended power range 75-750 watts RMS with the use of an optional 25Hz subsonic filter; otherwise 75-400 watts RMS"; Kicker Web site

also a vented box increases the sensitivity of the L7 in a sealed box it is 87db and in a vented enclosure it rises to 93db.

[Randy Savage]

Originally posted by EPanther99
well an L7 can handle 750 rms but in a vented encloser without a subsonic filter it can only handle 400 rms....

"recommended power range 75-750 watts RMS with the use of an optional 25Hz subsonic filter; otherwise 75-400 watts RMS"; Kicker Web site

also a vented box increases the sensitivity of the L7 in a sealed box it is 87db and in a vented enclosure it rises to 93db.

Well, this is what happens. When you go below the boxes tuned frequency, the subwoofer has to rely on its own suspension to control the driver...which can cause damage with lower power levels than the sub is even rated for...

So, you are saying, that if I put an L7 in a ported box, tuned it at 30 hz or so, gave it 750 watts, and played a 35 hz tone it would blow?

All a SSF does is cut off the frequencies under which it is set at...it does not increase/decrease a drivers power handling...

[paikiah]

Originally posted by EPanther99
well an L7 can handle 750 rms but in a vented encloser without a subsonic filter it can only handle 400 rms....

"recommended power range 75-750 watts RMS with the use of an optional 25Hz subsonic filter; otherwise 75-400 watts RMS"; Kicker Web site

also a vented box increases the sensitivity of the L7 in a sealed box it is 87db and in a vented enclosure it rises to 93db.

and that's what snova's trying to tell you...

a subsonic filter will protect the subwoofer itself, so you can send more and more watts to it without the need to care about the subs going into over-excusrion. RMS 75~400w would probably mean that the subs will operate within it's limits, so it's safe without a subsonic filter.

[EPanther99]

Originally posted by snova031
Well, this is what happens. When you go below the boxes tuned frequency, the subwoofer has to rely on its own suspension to control the driver...which can cause damage with lower power levels than the sub is even rated for...

So, you are saying, that if I put an L7 in a ported box, tuned it at 30 hz or so, gave it 750 watts, and played a 35 hz tone it would blow?

All a SSF does is cut off the frequencies under which it is set at...it does not increase/decrease a drivers power handling...

i am not saying it cuts down the subs power handling, im saying KICKER...who makes the speaker says you should use one.....i know what a ssf is...i also know what it does...without one in the vented bx you will get exsesive port nosie due to the fact that the speaker will be moving so rapidly to create the low freq, and yes i know it has to rely on its on suspension it owuld be acting almost like a free air speeaker, but it still definatly increases the sesitivity of the sub bc it uses the power more efficently....and about the wattage to blow the speaker, i dont know, i was just coping exactly what the Kicker web site wrote...

[EPanther99]

Originally posted by paikiah
and that's what snova's trying to tell you...

a subsonic filter will protect the subwoofer itself, so you can send more and more watts to it without the need to care about the subs going into over-excusrion. RMS 75~400w would probably mean that the subs will operate within it's limits, so it's safe without a subsonic filter.

i know its safe to use one without one, but not at very high power, im going to be putting about 900-1000 watts rms to the sub so i just assume not spend another 180 bucks to buy another L7 just bc i didnt want to use the filter....the whole reason for this post was just to see if anyone thoght that box in the link would be alright for the L7

[paikiah]

Originally posted by EPanther99
i am not saying it cuts down the subs power handling, im saying KICKER...who makes the speaker says you should use one.....i know what a ssf is...i also know what it does...without one in the vented bx you will get exsesive port nosie due to the fact that the speaker will be moving so rapidly to create the low freq, and yes i know it has to rely on its on suspension it owuld be acting almost like a free air speeaker, but it still definatly increases the sesitivity of the sub bc it uses the power more efficently....and about the wattage to blow the speaker, i dont know, i was just coping exactly what the Kicker web site wrote...

I don't think ssf's are meant to reduce prot noise either, although it MIGHT help, since 20Hz would mean a lot of air moved.

[EPanther99]

Originally posted by paikiah
I don't think ssf's are meant to reduce prot noise either, although it MIGHT help, since 20Hz would mean a lot of air moved.

like i said im not just pullin this stuff out of thin air its all on kicker website and in the manuals for the speakers....but you answered your own question about not cutting down ports noise....20hz would be a ton of moving air whichin coming through the prot would be a lot of noise but if it cant get it to make it then there is no noise from it...

[paikiah]

port noise would not be heard if you calculate correctly and try to get port velocity under 25m/s. Usually, a slot port would suffice, as they can be large, but also, the larger the port, the longer it gets.

Try to tinker around in WinISD pro, with both the cone travel and rear port velocity in mind.

THe ssf will simply cut anything under the set frequency.