posted
the guy at my local audio place told me to stop my sub from bottoming out, i will need an amp with an infrasonic filter. my 1200.1 dosent have one. so is there a way to buy one external? ive never even heard of it. but i dont want a new amp. i just got mine. also the guy said a crossover wont help either. my sub is picking up all notes of music and at loud volumes, it will bottom out unexpectedly and it sounds horrible.. thanks
-------------------- 93 Chevrolet 1500
-alpine CDA-9813 deck -fultron tweeters -kenwood 4x6 -1 Kicker Solo Baric 12 L5 -JBL 1200.1 -ported box 42 Hz -Dynamat Original on doors,back cab wall and firewall -Scosche 4 gauge wire -Audiobahn 20ft RCA's Posts: 108 | From: Olla La. U.S. | Registered: Aug 2001
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-------------------- SQ Here I Come... HC 15 + MMats D300hc = Sounds DAmn Good And IS ve"RE" Loud i love ported boxes and really big unheard of subs http://members.sounddomain.com/oldsjbl Posts: 283 | From: Salinas CA | Registered: Oct 2002
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Don't get caught in the WEB Gimmie some bass baby keep your XXX and others, MTX for me Is that me in the top 10 now?? Do you smell what the BASS is cooking... Posts: 6799 | From: cincinnati, oh, USA | Registered: Jun 1999
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posted
ok i asked the guy about the F-MOD and he said it is only good for not having a crossover in your cd player and amplifier. he said the extreme low notes will still be played with a F-MOD. i need soemthing that will block out everything under like 40hz. cause thats where distortion starts and also where my box is tuned to. will a 40hz F-MOD do this?? i kinda hate to blow 30 bucks and it not even help. thanks
-------------------- 93 Chevrolet 1500
-alpine CDA-9813 deck -fultron tweeters -kenwood 4x6 -1 Kicker Solo Baric 12 L5 -JBL 1200.1 -ported box 42 Hz -Dynamat Original on doors,back cab wall and firewall -Scosche 4 gauge wire -Audiobahn 20ft RCA's Posts: 108 | From: Olla La. U.S. | Registered: Aug 2001
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posted
I never liked to disagree with someone, and this is the case now. A- a loudspeaker will bottom out ONLY when the box is not right, or it is being overdriven, or the speaker's suspension is sagged over time. An Infrasonic filter will only work in the "Infrasonic" range (hence it's name) which is below 15Hz . There is still musical information below 20Hz let alone harmonics . Putting a filter at 40Hz will effectively increase your output, reduce some detail, and overdrive your speaker into more damage by trying to get those lost low notes. My advice , try a more powerful amplifier, chances are you have your 1200 into a very low impedance (below 4ohms) and your amplifier lost whatever "Damping Factor" it had. Or try a different cabinet. A filter is not a good band-aid in this case . You did mention that you're tuned to 42 Hz, yet that's where the distortion starts, think about it .
-------------------- E.C. Wuz here Posts: 1057 | From: Vancouver, British Columbia, Canada 'eh | Registered: May 1999
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posted
well the sub never done any of this until i got the amp. so i know its not the box. i think its the amp. so if i run it a a higher ohm load (im at 2 ohms now),will it stop the bottoming out? its just weird cause it will only bottom out on the really low notes. seems like if i could get rid of those, it would be alright..
-------------------- 93 Chevrolet 1500
-alpine CDA-9813 deck -fultron tweeters -kenwood 4x6 -1 Kicker Solo Baric 12 L5 -JBL 1200.1 -ported box 42 Hz -Dynamat Original on doors,back cab wall and firewall -Scosche 4 gauge wire -Audiobahn 20ft RCA's Posts: 108 | From: Olla La. U.S. | Registered: Aug 2001
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quote:Originally posted by mud_monster_220: well the sub never done any of this until i got the amp. so i know its not the box. i think its the amp. so if i run it a a higher ohm load (im at 2 ohms now),will it stop the bottoming out? its just weird cause it will only bottom out on the really low notes. seems like if i could get rid of those, it would be alright..
Yes, if you increase the resistance your amplifier will have more control of the speaker's motion, you will probably notice better detail, and tighter bass, despite the decrease in volume level . one more note, have someone check the "gain" control setting on the amplifier using a proper test disc . As I mentioned, if you get rid of the really low notes, why have a sub-woofer ? Fix the problem at hand . Also keep in mind ; 100w @ 4ohms 200w @ 2 ohms 400w @ 1 ohms all of these are the SAME amplifier , and a speaker's resistance changes when it playes music.
-------------------- E.C. Wuz here Posts: 1057 | From: Vancouver, British Columbia, Canada 'eh | Registered: May 1999
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