KU40

What head unit do you have? edit- nvm I apparently forgot you said Alpine. Try running a ground from the amps straight to the battery. Just a loose one outside of the car to test will work.

Well you'll still have to calculate the aero port's displacement and add that to the gross size of the box.

Supposed to start getting awesome outside though. High of only around 80-82 for the 10 days after tomorrow Finally can break out the fishing pole again, which has been in the corner of my room since I moved in three weeks ago. Or the golf clubs, which have been right next to it.

and another crappy night of sleep. Awesome. At least it's Friday.

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Are you sure that you don't have a bass boost on in the head unit

32 hz is quite low for SPL competition. What is your box tuned to? It should peak higher than that.

it works perfectly fine.. for some reason it'll play way higher than 40 Hz.. LPF.. Apline CDA-9855 what slope, if it is only a 6db then of course it will 18 db. Let me guess, you have the lowpass at 35 but in order to get decent bass you have to turn the gain on the amp all the way up? Then it makes it bottom out easily but not play the high stuff because of the low pass filter. Are you sure it's making mechanical noise on the highs? Mechanical noise comes from the cone moving a decent amount, and I can't see the cone moving hardly at all on the higher bass notes when your lowpass is at 35. Try this out- turn the crossover off on the head unit. Turn the lowpass xover on the amp to 80 hz. Reset the gain.

Well then I guess you just have to adjust the gain on the sub amp as well to compensate. You won't use as much head unit volume bandwidth, but oh well. Apparently your head unit puts out a lot of voltage, so set the gains with the volume lower to reduce signal voltage and you'll have more play with the gains.

"V10 in a box" haha. Man, a V10 in that little-ish car is crazy.

old thread.

Size depends on how much room you have to give up. Voice coil depends on the amp you want to buy.

Exactly what kind of crossover is your head unit putting to the subwoofer amplifier? High pass or low pass? Either way, 35 hz doesn't work. You need a low pass around 80 and a highpass (subsonic) around 25.

How much power do you think your amps are putting out when your head unit is at volume 1?

Well I ran it in right at 22 minutes. A bit disappointing, I was hoping for <21. But a dumb sideache slowed me down for the last 1.25 miles. And of course my calves were trying to cramp as soon as I quit unless I kept walking. Worst part is I don't have anything in the house rich in potassium. Oh wait, I just bought some potatoes at the farmers market yesterday. According to this page I looked up, they have more potassium than a banana with the skin. My only other option would be to hack off a piece of a hand sample of orthoclase (potassium feldspar) that I have. But that may be a bit too much.

About time to go run 3 miles. Some friends ran a 5k over the weekend and I thought I wanted to do it next time. So I figured I'd go see how I would fare. I've never ran this far before.

You ever wake up in the middle of the night, get out of bed, take down a piece of artwork off the wall, sit it down on the ground, then get back in bed and go back to sleep? THAT is ridiculous Hmm, yeah, that is more ridiculous. haha.

Attenuation, as in limiting power. Sometimes they do it through resistors in the tweeter signal path inside the passive crossover, or maybe the tweeter is just a higher impedance. If the mid can handle 150 but the tweeter can only handle 35, and they rate the set for 150, something has to lower the power going to the tweeter. Tweeters can't sense anything. You can always limit power output of an amp by just turning the gain lower than the input signal voltage from the head unit, instead of matching it for maximum, unclipped power.

I'm not sure where you learned math, but an 8 x 2.25" port does not give you 11.25 square inches of port. It gives you 18 square inches. But that is not too much port area. Factoring in 3/4" wood, your box is about 2.2 cubes gross. Take out .1 cube for the sub and about .42 for the port and you have a net of 1.68. Plug this into winISD and your tuning frequency is a little over 30 hz. So you're still ok there. What crossovers do you have on the sub, and where are they set? Are you using any bass boost either in the head unit or amplifier?

What is your deal? We've told you 9 times that this doesn't make any sense to do and won't sound right. Either tell us the reasoning behind these questions or we will start deleting all of your threads on this matter.

It depends COMPLETELY on the subs and if they can handle the power increase. With the subs on today's market, no, you will not see a 3 db difference between 4k and 8k if that's on one sub, probably even two.

As long as you know what songs play frequencies below your tune and turn it down when those come on you'll be fine. I ran my ported box @ 30 hz with the subsonic turned off for 5 years and never had a problem. *not condoning this action for everybody. If you're a noob, get a SSF*

Why would it hurt the amp? That's what it's rated for. I've also never heard of any other amps that are rated stable at 2 ohms not being able to handle it.

Each of the mid and tweet are 2 ohms, and each should be able to handle 150 watts (unless the passive filter that comes with the set has some sort of attenuation on the tweeter). Since the mid and tweeter don't play overlapping frequencies, their impedances and power handling do not combine. I'm sure they would do well with an active setup. Your best bet may be to get two 4 channel amps and have one amp power the mids and the other power the tweeters. I only say that because your other alternative would be to wire the mids on each side together, but you'd get a net load of either 1 or 4 ohms per side. I'm not sure how difficult it would be to find an amp that puts out about 300 watts per channel at either 1 or 4 ohms.

Last night I woke up with a cramp in my left calf. A little later I had a cramp in my right calf. Then it was a cramp on the bottom of my left foot, then the bottom of my right foot. I was like WTF is going on here?!?!?! I worked out yesterday, but only my upper body. I was like this shit is ridiculous.