Very Kon- Foosed!!!

[Ali1 10+ year member]

Okay, so i got my HO alternator from mechman charging @ 14.8v strong. Amps are independent and wired to each L7. Two bxi 2608s driving two 15'' L7s to 1ohm each. Ported Enclosure tuned to 35hz. Problem is I can't get my L7s to play properly at normal listening levels (Didn't even get a chance to turn up volume to SPL level) . Settings on each amp are as follows:

gain set by DMM to 50.9v

Phase - 0

bass eq - 0

subsonic - 25

LPF- 140hz

Both L7s have deteriated and read 0 ohms, meaning they are blown. Cone is stiff to the point where you cannot push on the cone. Electrical system includes the 250 amp alternator, d3100, red top optima, 1/0 throughout vehicle. Anybody have any insights as to why my subs are behaving this way?

Click to read more...

 

[GAM3OVR 5,000+ posts]

2 mush powa?

 

[JG903 10+ year member]

how big is the box?

And that is alot of power. Headroom is nice but shit that is alot.

 

[scarolinablazin 10+ year member]

played below freq?? box tuned to 35 yet subsonic set at 25?? maybe?? that combined with to much power?? ahhhh i gotta keep a watch on this thread. had a similar thing happen 2 weeks ago. sub locked up before it was at 1/3 volume and wasn`t even loud. maybe same problem.

 

[lilmaniac2 5,000+ posts]

if it is reading zero ohms you have a short somewhere, normally if a sub is blown it will read infinity ohms, ie infinate resistance ( no connection )

 

[overkill phil 10+ year member]

2-1000 watt rms subs ran by 2-2600 watt rms amps equal blown subs and posible a faulty amp smart guy

 

[overkill phil 10+ year member]

if it is reading zero ohms you have a short somewhere, normally if a sub is blown it will read infinity ohms, ie infinate resistance ( no connection )

remember he said the cone was frozen,that means a blown sub no matter what dum dum:laugh:

 

[Ali1 10+ year member]

2-1000 watt rms subs ran by 2-2600 watt rms amps equal blown subs and posible a faulty amp smart guy

Subs are seeing nowhere near 1500rms, let alone 2600rms. This was at ordinary listening levels, as i was checking for voltage readings at the amps. No vibration and No air movement, just at low volume.

 

[Ali1 10+ year member]

played below freq?? box tuned to 35 yet subsonic set at 25?? maybe?? that combined with to much power?? ahhhh i gotta keep a watch on this thread. had a similar thing happen 2 weeks ago. sub locked up before it was at 1/3 volume and wasn`t even loud. maybe same problem.

Aren't I supposed to set subsonic to 10hz below my box tuning?

Although I'm running my amps independent, my phase is supposed to be set on 0 on both amps, correct?

 

[t-money 10+ year member]

Aren't I supposed to set subsonic to 10hz below my box tuning?

Although I'm running my amps independent, my phase is supposed to be set on 0 on both amps, correct?

yes, its not cause of the sub sonic filter (being set 10hz below tuning, although i set mine around 5-10 hz below tuning)), either there's a short or the subs are blown. But if the cones are froze up, chances are they're blown.

 

[Ali1 10+ year member]

i know they are blown, it doesn't take a rocket science to figure that out. I'm trying to find out the issue before i replace them with new L7s

 

[lincolntc690 10+ year member]

box size maybe??just an idea

 

[Ali1 10+ year member]

subs are getting a little under 4cubes a piece after sub/port/ brace displacement