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need help with amp gain/subs problem
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<blockquote data-quote="trunks9_us" data-source="post: 3183326" data-attributes="member: 562522"><p>Ok i know that the gain is not a volume control button but i am a lil bit confused on how the gain is working. Ok so heres the thing i got 3 jbl gti's 12's there 700 rms each sub so thats a total of 2100 rms. They peak at 4000 watts each, so i am running a zapco 9.0 4ohm version and i am running these subs at a 4 ohm load. Well I have been told many times by my dealer and ppl on here the the gti's can hanle 1000 rms easy. Well my zapco 9.0 is rated at 2200 rms at 4ohms and its under rated so lets be on the big side and say its putting out 3000 rms. Ok so i had a dealer build me the correct box and its right i got the measurments checked out , there 38x12.5x16 outside measurement. With polyfill in the box.</p><p></p><p><a href="http://manuals.harman.com/JBL/CAR/Boxes%20and%20Parameters/W12GTi_rev_f." target="_blank">http://manuals.harman.com/JBL/CAR/Boxes%20and%20Parameters/W12GTi_rev_f.</a> pdf</p><p></p><p><a href="http://manuals.harman.com/JBL/CAR/Owner%27s%20Manual/GTi%20MkII%20Sub%20" target="_blank">http://manuals.harman.com/JBL/CAR/Owner%27s%20Manual/GTi%20MkII%20Sub%20</a> OM%2005.pdf</p><p></p><p>Its in a sealed box, &amp; I am running 16 volts preamp from my hu to my amp which is what the amp can take. so it has clean power going to it and when it was working i had the gain set to 25, max is 30 which is what they told me not to go over. I am told by zapco.</p><p></p><p><a href="http://www.zapco.com/prod/comp_prods/documents/TechnicalBulletinC2K9.04KW.pdf" target="_blank">http://www.zapco.com/prod/comp_prods/documents/TechnicalBulletinC2K9.04KW.pdf</a></p><p></p><p>my hu's max volume is 35 i have it at 29 before it starts clipping.</p><p></p><p>I usally keep volume at 28-29.</p><p></p><p>Read that techbulletin.</p><p></p><p>I also have a bass volume control knob to control bass.</p><p></p><p>Ok so now my question when i have it at 28 or 29 volume control i turn up the bass a lil bit then as i start to get to the middle on my knob its still hitting hard but about at 2/3 of the way i am going to open my trunk and the subs are hitting but its not sounding right. They sound totally different like bad sound but in the car with the trunk closed the sound fine. So what i am wandering is why is it sounding bad theres no pops or anything but u can just tell by how there sounding and how there sounding when the subs are hitting cause it sound nothing like it would if it was hitting at 1/2 or 1/3 the power. So any ideas on what to do? Plz read the zapco tech bulletin cause i would think turn the gain down but then i would never get my full rms wattage. so if u think its turn the gain down let me know but plz help me thx.</p></blockquote><p></p>
[QUOTE="trunks9_us, post: 3183326, member: 562522"] Ok i know that the gain is not a volume control button but i am a lil bit confused on how the gain is working. Ok so heres the thing i got 3 jbl gti's 12's there 700 rms each sub so thats a total of 2100 rms. They peak at 4000 watts each, so i am running a zapco 9.0 4ohm version and i am running these subs at a 4 ohm load. Well I have been told many times by my dealer and ppl on here the the gti's can hanle 1000 rms easy. Well my zapco 9.0 is rated at 2200 rms at 4ohms and its under rated so lets be on the big side and say its putting out 3000 rms. Ok so i had a dealer build me the correct box and its right i got the measurments checked out , there 38x12.5x16 outside measurement. With polyfill in the box. [URL="http://manuals.harman.com/JBL/CAR/Boxes%20and%20Parameters/W12GTi_rev_f."]http://manuals.harman.com/JBL/CAR/Boxes%20and%20Parameters/W12GTi_rev_f.[/URL] pdf [URL="http://manuals.harman.com/JBL/CAR/Owner%27s%20Manual/GTi%20MkII%20Sub%20"]http://manuals.harman.com/JBL/CAR/Owner%27s%20Manual/GTi%20MkII%20Sub%20[/URL] OM%2005.pdf Its in a sealed box, & I am running 16 volts preamp from my hu to my amp which is what the amp can take. so it has clean power going to it and when it was working i had the gain set to 25, max is 30 which is what they told me not to go over. I am told by zapco. [URL="http://www.zapco.com/prod/comp_prods/documents/TechnicalBulletinC2K9.04KW.pdf"]http://www.zapco.com/prod/comp_prods/documents/TechnicalBulletinC2K9.04KW.pdf[/URL] my hu's max volume is 35 i have it at 29 before it starts clipping. I usally keep volume at 28-29. Read that techbulletin. I also have a bass volume control knob to control bass. Ok so now my question when i have it at 28 or 29 volume control i turn up the bass a lil bit then as i start to get to the middle on my knob its still hitting hard but about at 2/3 of the way i am going to open my trunk and the subs are hitting but its not sounding right. They sound totally different like bad sound but in the car with the trunk closed the sound fine. So what i am wandering is why is it sounding bad theres no pops or anything but u can just tell by how there sounding and how there sounding when the subs are hitting cause it sound nothing like it would if it was hitting at 1/2 or 1/3 the power. So any ideas on what to do? Plz read the zapco tech bulletin cause i would think turn the gain down but then i would never get my full rms wattage. so if u think its turn the gain down let me know but plz help me thx. [/QUOTE]
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need help with amp gain/subs problem
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