Alpine Type R D4 12"

Had the Kenwood kac-9105d already

Random prefab ported box 1.75 gross ft^2 (probably around 1.4-1.5 ft^2 after sub is in) at 34 Hz

200 bucks for it all new figured not a bad buy at all. Bumps fairly decently but I haven't come anywhere close to the amount of power I plan to put on it yet.

Currently putting about 600 watts RMS through it now.

This post was edited by dezzle_mane on Apr 8 2017 06:12pm

if its a dual 4 on that amp how are you running it at 600 watts? the amps rated at 900@2ohms which is what that subwoofer wires to unless you wired it for 8 ohms which would be a weird choice.

you said "all new" but the amp could be as old as 2010 and by the looks of it i wouldn't be surprised if it was bought around 2012-2013 and the subwoofer was available since 2012 i think. don't believe rand people when they tell you how long they've used these things unless they have receipts.

honestly this is about as far as you should go with this sub. trying to push it to 1200rms+ with its random age is just russian roulette.

and about the price its not too bad if it last you a while. this is about $400 when it was new and hopefully has been used with just this amp the entire time. if so it should be a fairly safe investment.

This post was edited by Subwoofer on Apr 8 2017 06:43pm

I bought the Kenwood amp brand new unused in 2014 and had it on another system. The sub was purchased monday unused from sonic. Power to the sub is dictated by ohms law where V = IR or power = V^2/R. To get the rms power at 600 watts, I turned my speakers up to about 75% max volume, played a 50 Hz Sine wave, placed a multimeter with positive and negative on their corresponding charges on the speaker outs on the amp, and adjusted the gain until I was at the voltage that corresponds to 600 watts which is 34.6 volts (likely slightly less power than this if you factor in the speaker wire resistance and the ground/power wire resistance.)

i got use to people coming here setting gains not actually knowing how is effects output depending on what your head unit is set at and think that just cause your head unit is only on 25/50 they are only getting half the watts when they haven't done the math as you have.

you waiting on electrical upgrades before you give it the full 900?

Yeah. Gonna pick up an alternator and battery soon. Once I figure out the gauge of the stock power/ground cables coming from the battery then I'll decide if I need to replace those also.

http://www.knukonceptz.com/mobile-audio/power-wire/kolossus-kandy-kable/

i'd just go ahead and replace them. they are almost always 8-10 gauge and going straight to 1/0 for big 3 upgrade can be done for ~$30-40 which will handle anything you throw at it.

Is that true awg wire? looks really solid if it is and the price is pretty good. I'm probably gonna go with an alternator between 150-180 amps for 900 watts rms but I might go bigger if i decide to add in another 12 down the road. I will likely run the sub at around 800-850 rms for a while to see if I get any headlight dimming and if I do then the alternator is 100% getting upgraded.

Played Waddle by Gorilla Zoe at about 65% volume on the HU and my roof was flexing on 600 watts I lol'd honestly wasn't expecting that at all

nice

Sounds nice.