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Tommy108

New build going poorly...need advice

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So after being out of the game awhile I decided to dust off my old equipment...my 3 subs gave it up as soon as I tried to power them up...anyway I ordered 2 fu300's that just came in today...so I have a Kenwood kdc 155u hu, old school california 600 amp and the 2 12's...when I hooked it all up today it sounded ok for about 15 mins...after that the amp overheated and began cutting in and out...now I can't figure out why power's up ok sounds great till it gets hot...any ideas?

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You are probably running the amp at a lower impedance than what it's rated for. Is this your amp? https://www.crutchfield.com/S-djuuWN06e2T/p_489600MSX/Profile-California-600MSX.html

or this one? https://www.crutchfield.com/S-uTCkSQct4Ib/p_489CA600M/Profile-California-CA600M.html


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So after being out of the game awhile I decided to dust off my old equipment...my 3 subs gave it up as soon as I tried to power them up...anyway I ordered 2 fu300's that just came in today...so I have a Kenwood kdc 155u hu, old school california 600 amp and the 2 12's...when I hooked it all up today it sounded ok for about 15 mins...after that the amp overheated and began cutting in and out...now I can't figure out why power's up ok sounds great till it gets hot...any ideas?

are the subs d2 or d4


KENWOOD X301 HU, PRECISION POWER Phantom 1000, FU 750 12, 2.1cfad ported, soundqubed 6.5" coax/doors, hp & lp xover on hu, AGM starting batt...

Boomin_tahoe said:
2 ohms rule

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clipping or too low impedance


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You are probably running the amp at a lower impedance than what it's rated for. Is this your amp? https://www.crutchfield.com/S-djuuWN06e2T/p_489600MSX/Profile-California-600MSX.html

or this one? https://www.crutchfield.com/S-uTCkSQct4Ib/p_489CA600M/Profile-California-CA600M.html

Yep thats it...impedance should've been ok read 3.something on my multi-meter...as far as I know this amp is stable from 2ohm up

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are the subs d2 or d4

 

d4

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d4

 

are u sure u wired each to 8 ohm and bridged amp at 4 ohm? if u wired to 2 ohm each and bridged thats a problem.. i suggest u get a 800-1k mono amp with ss filter.. are you using ported box?, if so u need ss filter..


KENWOOD X301 HU, PRECISION POWER Phantom 1000, FU 750 12, 2.1cfad ported, soundqubed 6.5" coax/doors, hp & lp xover on hu, AGM starting batt...

Boomin_tahoe said:
2 ohms rule

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clipping or too low impedance

 

I was pushing it hard at first...butt turned gain way down and tried lower volume levels still had the issue...of course it was already pretty hot...what impedance should i wire it to?

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are u sure u wired each to 8 ohm and bridged amp at 4 ohm? if u wired to 2 ohm each and bridged thats a problem.. i suggest u get a 800-1k mono amp with ss filter.. are you using ported box?, if so u need ss filter..

 

Yeah checked it with multi meter...yes it's a ported box...however this is a mini amp it wasn't bridged

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Lol mono amp...stupid spell check

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Lol mono amp...stupid spell check

lol sorry i thought it was 2 channel saw 100's of those blue amps yrs ago.. if u wired each sub at 2 ohm u are at 1 ohm load i feel sure that amp won't like that.. probably shoulda got the d2's.. so we are back to what i said get a mono amp that's 1 ohm stable., something like soundqubed s1 850 would be good on those and u would have ss filter..


KENWOOD X301 HU, PRECISION POWER Phantom 1000, FU 750 12, 2.1cfad ported, soundqubed 6.5" coax/doors, hp & lp xover on hu, AGM starting batt...

Boomin_tahoe said:
2 ohms rule

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lol sorry i thought it was 2 channel saw 100's of those blue amps yrs ago.. if u wired each sub at 2 ohm u are at 1 ohm load i feel sure that amp won't like that.. probably shoulda got the d2's.. so we are back to what i said get a mono amp that's 1 ohm stable., something like soundqubed s1 850 would be good on those and u would have ss filter..

 

Actually if I like them I was thinking of running 3 of them...however I would really like to get the 2 going first to see how I like fu's

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Sorry kush I misread your post...mine is the first one the blue one

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iirc, that amp isnt stable at 1 ohm


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Majority of the older amps aren't 1 ohm stable.


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iirc, that amp isnt stable at 1 ohm

I realize I'm not 1ohm stable...butt I should be 2ohm stable correct?

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I checked the final impedance at clips in back of box with multi-meter...reading was 3.5 or somewhere thereabouts...is this the correct way to check final impedance or have I mistakenly wired to a lower impedance?

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Actually if I like them I was thinking of running 3 of them...however I would really like to get the 2 going first to see how I like fu's[/quote

well not gonna run 3 off that amp with any power anyway.. have to wire 8ohm each give u about a 3 ohm load something like 300rms total so thats out.. if u were gonna run 3 u shoulda got 3 for $150 but u would really need d2's with a 1 ohm stable amp to get any power.. best u can do with that amp is get a single ported box and power 1 with about 400rms at 2 ohm (keep in mind peeps run 600rms each to these)


KENWOOD X301 HU, PRECISION POWER Phantom 1000, FU 750 12, 2.1cfad ported, soundqubed 6.5" coax/doors, hp & lp xover on hu, AGM starting batt...

Boomin_tahoe said:
2 ohms rule

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I checked the final impedance at clips in back of box with multi-meter...reading was 3.5 or somewhere thereabouts...is this the correct way to check final impedance or have I mistakenly wired to a lower impedance?

 

That's 4 ohms for all practical purposes.

 

Old class A/B amps get hot if you push them. I'd also suggest looking into a modern 1 ohm stable class D. Should be some 1000W options in the 100$ price range.

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That's 4 ohms for all practical purposes.

 

Old class A/B amps get hot if you push them. I'd also suggest looking into a modern 1 ohm stable class D. Should be some 1000W options in the 100$ price range.

 

What would you suggest to push 3...and what price range?

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