Factory sub.

Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.

jpwhre

Active Member
Joined
Jun 29, 2019
Posts
36
Reaction score
5
Location
Tucson, AZ
Well I have seen things here and there on the world of the web. Some saying it was a 100w system. Others saying it was 150w. But getting it open today and finding an alpine dvc 60+60 (120w) speaker and an amp labeled 5W4T-18C808-A8 makes me wonder. But since the planet audio 8” (500w rms - 1200w max) (almost) bolts in with a kenwood 500w rms 1000w max amp, it should be a clean-ish install

The 2 subs I bought that need box and amp will slowly come up on next in time.

989A04AC-6C7D-4283-8718-E1F3BBE70C14.jpeg
 

johnboneske

Full Access Members
Joined
Mar 30, 2010
Posts
759
Reaction score
169
Location
Ohio
I do know the factory amp is suppose to be 70 wattsx2 at 2 ohms. Yes, each voice coil is rated 2 ohms... So when repairing it, say with a DVC sub that's only 4 ohms will only yield around 40 to 45 watts per voice coil.
 
OP
OP
J

jpwhre

Active Member
Joined
Jun 29, 2019
Posts
36
Reaction score
5
Location
Tucson, AZ
I’m replacing with a dvc 4ohm but wired at 2ohm. It is rated at 600w rms/1200w max and under powering it with an amp @ 2ohms has 500w rms/1000w max. I worry how long the plastic box will hold up.
 

johnboneske

Full Access Members
Joined
Mar 30, 2010
Posts
759
Reaction score
169
Location
Ohio
I’m replacing with a dvc 4ohm but wired at 2ohm. It is rated at 600w rms/1200w max and under powering it with an amp @ 2ohms has 500w rms/1000w max. I worry how long the plastic box will hold up.



the sub is what determines what the ohm rating is, not the amp. How do you wire a DVC sub that's 4 ohms to 2, except both voice coils in parallel? Then your using only 1/2 the amps output. Your better off buying a 2 ohm DVC sub
 
OP
OP
J

jpwhre

Active Member
Joined
Jun 29, 2019
Posts
36
Reaction score
5
Location
Tucson, AZ
Yeah I used Crutchfield wire diagram to wire subs and amp. I’m sure I got the strong end of the unicorn horn when I first started this. I bought the kenwood amp some time ago. It showed 1000w max when I got it. (Go easy, I’m nearing 47 years young) back in my day a 500w amp was 500w, there was no rms crap. This amp was 1000w max ar 2ohm. I had a 500w amp and 2 subs rated at 250w. The box was big enough to handle 2 speakers sized for 12” but held 10’s instead. And they were bandpass in the trunk of a car. That setup I could be heard 1 mile away in city traffic. Fast forward to rms. I used that same box on a set of “cant be blown” speakers and a kenwood amp that was rated at 1000w (me not up to date with rms standards of today and remembering what 500w did) I had lights flickering and sub par bass (the speakers dried out). Back to today, rms, big 3, caps and batteries are just bandaids to the real problem, not having a sealed enclosure (trunk) to move box around to find ultimate sound quality. I have learned the following

Ported=30hzs tuned only works if I want to do spl for comp. I’m old school and actually listen to music

Sealed=500w of speakers needs about 700w amp to push.

Doubled does nothing. My 8” sub is rated for 600worms/1200w max. My 12” subs are rated 250wrms/1000w max (wait, what. Meth teacher doing math?) How do I find 500wrms/2000w max amp to push, the math doesn’t add up.

Other issue I have. 4 gauge wire I bought with first amp is half the size of 4 gauge wire I bought now (been doing electrical 19 years) wire size doesn’t change.

Am I so stupid that 2x30 fuses on amp (10x100 gives amp rating rms) only gives 500wrms on 1000w max amp at 2ohms and that 250wrms speakers can handle handle 1000w?

Must be that new foreign math crap we didn’t learn in school. 2+2=4 unless I before E except after C.

Either way, 25’ prewired amp kit comes no where close to getting this kit installed.
 
OP
OP
J

jpwhre

Active Member
Joined
Jun 29, 2019
Posts
36
Reaction score
5
Location
Tucson, AZ
Essentially I was expecting 1000w max output on amp. Ok under powering speaker. But total 500rms/2000 on 2 subs at 12” makes no sense at all (math wise) when I can’t find amp that does 500wrms/2000w max at any ohm. I get either total match rms/no where near max or max match blown rms. Doing sealed box in open air compartment not rating for spl (I want all lows to work) the meth just isn’t the way it used to work.
 
Top