General Audio

For those of you familiar with bass box pro and/or winisd, help me out here. The box is 2 cuft tuned to 30hz (12" rlp), 4" precision port When I do this calculation (Lv=((8466.4*r^2)/(Vb*Fb^2))-(1.463*r) I get a number like 15.89". Winisd gives 16.28" with end correction being .614 (is that right for 2 flared ends?) And Bass box Pro gives a length of 17.35". Which of these is correct? Or is there some other part if it I am missing? It seems as though they should all be the same length if my numbers are identical, but they obviously are not. Also, a precision port ordered from PE is 17" in length with adding the flares and not cutting anything, correct? Thanks

sorry for the lack of wisdom, but could somebody tell me what port noise sounds like? Because I just put my system in my car and unless i have the volume turned down to zero, my sub is constantly playing kinda loudly. Could this be how the amp settings are set?

hello all, newbie here with a question. Iam getting ready to build a ported enclosure and before I do I would like to know if there is a perferred placement for the port. is there an advantage to being on the same face as the subs or does it matter where they are placed? thanks in advance for your help

My girlfriend is gettin a system for her birfday and I'm bout to build the box, should I do sub up port back? It's a 02 wrangler 2door soft top. It's a single 12in skar vvx on a audiopipe 1000d at 2ohms. Box will be 2.2ft3 at 30hz

Is there a big difference between going with slot port or an aeroport?

I have 5.38 cubes after displacements other than port. My tuning is 32hz. I have an 8'' port going 12.75'' in the box, 12.75'' is my limit because I want 8'' of clearance from the bottom of port to bottom of box. Anyways, I have 12.75'' in and I have 7.8'' out of the box for a total of about 20.6'' of port. The port inside the box takes up .38 cubes so that leaves me with 5^3 inside the box after displacements. I think I have too much port length on the outside of the box, but I can still cut the port down. Any idea on what it should be?

Ok so im wondering if having the subwoofer pointing through the ski hatch and port somewhere elese in trunk is going to be louder or having the port go through the ski hole with the subs facing forward about 2" off of back seat?

How much round over do I need to do on the 90's inside a port?

can someone help me out and give me a port size for 2 18" btl'z the inside of the box demensions are 29" 3/4 tall 39" 3/4 wide 22" long tuned to 32 hertz can you let me know how many cubic ft. it is thanks.

If i have 2 BTL 12, what should the box be tuned to for comps...i mean i want to listen daily but i wanna put up numbers too...i want a deep droppin bass but dont wana loss numbers on da meter

I've been using a sub & box combo that I picked up at a local car audio store a few years ago to get me by and have recently begun thinking about upgrading. So I've been reading up and just trying to educate myself on the matter and tonight I went out to try and calculate the box volume and tune of the ports. Just wondered if I figured this out right. I used a calculator here (the vent length calculator at the bottom). I had the vent length so I swapped frequencies in and out until I got one to match. Here's what I know. The box contains 2 10s. It's 30.5" wide, 13" tall, 9.5" deep at the top and 12" deep at the bottom (so I used an average depth of 10.75"). Whe…

Ihave six 15s and the subs will be facing up, should I do port up or the port facing back this is going in a Denali

Hello to my car audio friends this it my first time posting.. i have a burning question. I want to put 2 15" in my ride and i want to give it the most space as possible. The problem is i have read subs up port back is the best application but i could only get the most out of it with subs up port up... how much would i be missing out on both the meter and ear by doing subs up port up?.. is it a big no no in the car audio world to use such application? thanks for the help in advance..

What would be a good size ported box for 2 ED EHQS 12's on a diamond D3 400.1? it is going in a Scion TC

need some help to come up with net volume and frequency for this sub. my friend will be running 2 of them in a blowthru and space is not an issue. the gray line is the rsdc (2 of them) with 1200rms, the red is 2 12" AA arsenals w/ 600 rms, and the orange is 2 12" l7s with 1200rms you can get the specs from the image if you like pg recommended, according to someone on pheonixphorum.com, specs for ported are 2.5 cubes per sub tuned at 23.28 hz. (spl secs are .8 cubes and tuned very high... like 50 hz iirc...) as you can see i bumbed it up to 24.5hz. but i still think this looks very low. i also notice you run out of xmax @ 600rms per sub.

I'm currently using two 18in btln2 on an xs8k in a 05 Hyundai Tucson enclosure was design by ram. I demo often with my four doors open and it sound great but there's a problem with loading when my doors are open I loose the deep sounding bass that I love. I'm either going with a ported wall down the center or a 4th order band pass. I'm worried that with the port being so close to the door that I'll have the same problem with loading that's why in considering band pass. New sub will either be the team fi or dc lvl6. So my question is what sub and orientation would best suite me app? If any....lol!

Of course i know the sound differences in a ported or sealed box, my question is a bit more detailed than that. I'm about to buy a Fi Q 12 and was stuck btwn building a tuned vented/ported box, or sealed. I listen to rock-metal-hardcore-etc. and rap. I know a ported will be perfect for rap but will it hit all the notes nicely for rock songs with quick bass? I've heard that a properly tuned box will hit fine but will it be as accurate as a nice sized sealed box? Thanks alot, much appreciated

Please help, I am about to build a box for XCON 12 D2 ported, and know nothing about the port dimensions. As well as a ICON 10 D1 ported....

does anyone know where i can find a positive ring terminal that can fit all those extra o ring terminals going into my positve side my nissan comes with? i dont want to cut them i just want to know if there is a terminal out there that can match it.. ive been looking around at scorpion stinger but havent had any luck yet.. anyone know of anything that matches this?? one of the conections seems to be power and the other has fuses on it.. here is a pic

hey guy, this is a branch from my original post. found this amp for sale let me know what you guys think http://www.lanzar.com/itempage.asp?MODEL=VIBE250 the guy wants 165 obo for it. yes? no? Jeremy

i've been looking for a cheap alternative to mlv. hows this looking, volara, density claims to be 2lbs/sq ft specs. i plan to uses this on my doors.

so if you all know, my final system is 2 Fi BL 12" 1000 RMS (1 OHM VC OPTION) 1 Sundown SAE-3000D 1500 RMS @ 2 OHMS **BOX: Dual 12" Ported Box (specs are below) Width: 40 Height: 16 Top Depth:20 Bottom depth: 20 Wood thickness: .75" Square Port Height: 14.5 Square Port Width: 5 The idea was to cut a rectangle behind the box, and behind the armrest in the backseat to allow air from the subs out, is this a good idea for more bass/airspace? I wanna hear what you guys think....HERE IS A PIC OF IT

i hooked up 2 PSI 18S and 2 Soundstream tx1.2000d amps. Gains and freq levels were set the same on each paired amp n sub. The first lil while i played it, everything worked fine. then all the sudden i notice one sub were playing lower than the other. wtf right...checked the impedance on the coils and they check out fine. So over the last few weeks ive done everything i can think of from checking connections, swapping subs around, new rca cables, even thought it might be the bass knobs, and still one of the amps is putting out less power. I can tell there is an issue because when i play a test tone, what ever sub is hooked to that amp suffers especially in the low range 20…

So i got a double din installed on my car and after about a month my system would just randomly turn off(headunit would power off and same with subs and amp) it did it once then would reboot. I took it in they changed the wire harness and the ground. It fixed it for about 2 days i then decided to change my negative battery cable and that fixed it for a few months and then it came back and i noticed that with the head unit turned off that there was a bass note from the subs playing real faint until i turn the bass knob it gets louder. What could be the issue on why my head unit turns off by its self faulty head unit, bad amp need help asap.

hope to get some inputs for the sub. it could be a single 12", dual 12", dual 10" or a single 15". car to be designed on is a 96 accord. target is to be able to play loud but accurate. meaning it can play rap, techno/trans, soft/ballads, rock etc., still with good readings from termlab... possiblly dbdrag style yet as accurate sounding as possible. requirements: 1. box is no bigger that 3.5 cubes - so that spare tire would be accessible 2. box design can only be a wedge 2 enclosure type box - to maximize all space and still get the spare tire 3. sub would be placed facing the cabin, possibly on the back seat position for a single sub, but towards the trunk for a dual sub …