General Audio

I have an ea alternator with an external voltage regulator. 12v under the hood and 16v 8400 in the rear. When i turn the vehicle on and adjust the regulator charge at 14.4 volts under the hood, the rear is charging at 21+volts. so, ill adjust the rear batt to charge at 18-19v and the 12v batt under the hood is charging at 12.4. Why? Could this be because the batcap 8400 hasnt been charged in several month and the 12v battery under the hood is at proper charge btw i do have a system setup to run a 12v and 16v....like a step down does this makes sense? lol

So I saw this while I was trying to add knowledge to my little brain and was curious as to how to figure how much power is going to each voice coil.. who can help me out??

IM doing a backseat box for a 07 dodge charger and just wanted to know the best direction to fire in? My original idea was to have subs inverted firing up and port up and no I don't want to wall it because im plannning on doing some fancy fiberglassing in the back seat. Im also not going to compete this is just a loud daily driver will be 2 18 zcons on a 5k amp. Just want to know optimal firing direction and the trunk will also be sealed off.

My friend has an 02 Mustang GT convertible. He wants to cram a BTL 15" inside. His rear seats do not fold down. The question is...If his seats were not folded down would that affect the bass significantly or only just a little bit. He was thinking of taking out the rear seats but that would expose the convertible motor and stuff. The first task is to see if a 4.0cuft box would even fit back there... Thanks for any help.

I'm slightly unsure as to what section to put this topic in so mods please move this if you see fit. I'm a first semester electrical student and I'm pretty familiar with the ohms law wheel and its formulas. But, for some reason I fall short when trying to calculate the total impedances of a certain car audio circuits. My question is what formulas do you guys use to figure out all of the different ohm loads that can be used w/ corresponding VC configurations. Ex. 2 Dual 2 Subs What are all of the ohm loads that can be reached. I understand that anyone can go 2 the rockford fosgate wiring wizard and find a solution. But I'm more interested in how these values are derived.

I've got an old school record player, Sony 100 disc changer, an old AKAI amp (from what, the '70's?), and a pair of JBL 3-ways. It sucks. So ... as some of you know, I do fine wood working in my spare time (coffee tables, china cabinets, cigar boxes, gun cabinets, pens, bowls, anything out of wood). I don't need another table in my home. What I do need, are some towers and subwoofer enclosure so I can eventually throw in some speakers and my uberwoofer. I'd love to make some enclosures out of a nice mahogany, eastern maple, oak, ash, anything really. I don't know chit all about HT. So I have to break it down real simple so I can understand it. I was thinking about tw…

would there be a noticable difference between 70wx2 passive on my RE 6.5's and 125x4 active thru my 860? i might be getting a visonik 4208. anyone used this amp? is it any good???

anyone ever order from this place? http://www.mobilesoundworks.com any bad experiences?

Ive read alot of people talking about it some argue theres know such thing but... what is rise? how does it affect your system? is there a way to couculate it? is there a free program to help factor it in? i hope this dosnt cause any problems just wanting to learn

need some help on some 6x9's. i have alpine sps-600 in the front doors so i was going to match them with the alpine sps-609 but then i saw the spr-69c is not much more money. should i get sps-609 or the spr-69c with no amp?

does anyone have a tl or know of a shop with one in houston willing to let me run a few sweeps and meter my car?

Just wondering what size to go with? When I ordered from Parts Express, the guy on the phone recommended 1/4" x 20, but turns out these dont fit the opening in my IDQ sub. What size does everyone else use?

do you?

Hi ladiess and gents, I have been thinking about my next subwoofer enclosure. To be a little different and it sounds to be a fun project, I wanna try and build a sonotube enclosure. Has anyone here had any experiance with them, good or bad? I also scoured the web and I can't seem to find prices or anywhere that sells sonotubes by the foot. Are there other names they go by? I am getting an 18 nightshade so there will be bracing and all that stuff. I'm looking to get a 24 inch dia. tube to keep the length down. Thanks.

So i've been working on box design for my new SA-15's. For external dimensions i have: 32 wide x 20.5 tall x 24 deep for 7.55 cubic feet before port volume or displacement. Wood thickness is .75" Then for a port, i would have the dimensions 30.5" wide , 4" tall and then 18.16" deep. I got the port dimensions from CarStereo.com. According to that site, the box is tuned to 32hz. I was wondering if that was correct or not because i know tons of those sites end up being wrong with tuning. Here's a picture describing my plan. The lines in that picture are parallel... I don't know why the camera says differently. So does that sound alright? If not, can someone please correct m…

I have an F350 that has captains chairs with center consoles front and rear. The stock head unit is quit acceptable feature wise, and even the door speakers are not awful, the lower frequencies are quite lacking however. I thought a nice clean way to solve the lack of bass might be to put a JL Audio Stealthbox in the center console (preferably the rear one) I don't even know where I can get one (I'm in Kamloops BC Canada). Another option is a "custom made" box with another sub in the center console, or a "truck box" behind the seats ( ick :-/ ). Any opinions? Know how I can get the Stealthbox at a reasonably price? I do have a 10" Cadence Beast subwoofer here not in use. …

What shall I start with........how about the old setup? My RE Subs have treated me well........ but what does the future hold? Kicker....DD......RE?!?!

I was thinking of getting 2 SSA Zcon 18's.. im tring to keep a budget, so for now i was gonna run a Hifonics Brutus 2400.1 on each sub until i can afford better amps...The are supposedly CEA certified.. any thoughts???? Are they worth a crap?

My goal for my rebuild is mainly spl with sq properties(140db+ ). I listen to all types of music. But mostly R&B and Rock. Current system: Alt- Stock (65 or 70amp) Batt- Stock Head Unit: Aplpine 9881 Speakers: Front- Infinity Refremce 5.25" Rear- N/a Center- Stock Ford 5x7 Subwoofer- 1400w Pioneer Shallow Mount Amplifier- 1400w Hitron 2 Channel class a/b (sucks @ss) The stuff that is on the chopping block is: The biggest box I can fit behind my seat with 3/4" mdf: Length- 60" Bottom width-10" Top width- 4" Height- 24" I would perfer it to be ported, but i dont know what specs it would be. If it cant be ported its fine by me. Subwoo…

I kno this is a real subjective thing but Im just trying to get ideas.. When I sell my truck Ill be getting a 99 maxima and ill have about 1000 left over and that all goes to the system. Im down to 3 sub choices: -2 Rl-p 15s sealed w/700/800 watts to each -1 Rl-p 15 ported w/700/800 watts -1 Mag 15 ported w/around 1200 watts (assuming I can get one when Im ready to put my system together) Everything else is up to you guys; deck, comps, 6x9s, sub amp, ect So what would you do in my shoes? Thanks Tom

i bought a fully loaded Fi BTL 18", dual 1 ohm I have a 1ohm stable amp. Hifonics Bx1605d for the moment until i buy my sundown 3000. How do i wire the sub at 1 ohm? probably a newb question, i know and im sorry but i searched a while and couldnt find anything. sorry i am just confused and dont have anyone near me who can do it or tell me with out charging. i am new-ish to the car audio thing but i know how to do most of it. Only 17. please give me some pointers or a link to somewhere to give me a hand or something to make sure i do this rite. Thanks in advance!!! Nofear.

Well I finally got my car all cleaned up. I recently bought a 1995 Nissan 240sx SE, last thursday. Enough my pictures, the car was professionally buffed at work(I work for Toyota) and my buddy still has to do the inside. It cost me 50$ through work for a basic detail, and then I paided him $25 plus 3 days of lunch. So basically I'm paying about 85-95$ for a 500+ detail job. He spent 5hours buffing, polishing, and waxing the outside today, and is going to do the inside tomorrow at work. Heres the pictures... I'm very excited about this car. BEfore anyone says... why didnt you do it yourself, well for one, this was professionally done by out TOC detail division at work. TOC…

So I am going to do a new audio install on a '00 mercedes e320 and I'd like to run it by this crew to see if anyone has any suggestions. I am not very experienced at car audio but i am convinced that with a set of Crutchfeild mastersheet instructions and the help from a friend who has done several installs i can do it. So heres the setup. Head Unit: Alpine iDA x305s with the PXA h100 imprint processor along with the KTX h100 to get it set up (this is extremely intriguing to me and I want to try it any opinions on wether I should get it or not?) Component Speakers (front only): Image Dynamics CTX 65cs Speaker amp: Sundown Audio SAX 125.2 Subwoofer: 15" Fi BL (still looking…

Alright So My Girl Said She Wants A System For Her SUV. She Knows All About My 15 " FI BTL and How Loud It Is Because Ive Explained To Her And Showed Her Videos Of What It Can Do When Strapped With A SAZ 3000D She Said She Doesnt Want Anything That Loud But I Want To Get Her Something Good And No Sony, Kicker, Or Walmart Chirt lmao. I Dont Know Weather to go with 10's or 12's But She SPECIFICALLY said NOOOOo big box so im thinking 10's Its Going In A Ford Explorer 2 Door. My +Questions For Everyone Is What Should I Go With ? 1. Nightshades 2. FI ( Non Expensive Models ) 3. SSA 4. Other (If So What Brand )

Yes it's a little obscene that I have 97,800w on tap. No it's not in a car. Its in a 2200 seat church. All the power ratings except for the subs are at 8 ohms. We have all four channel amplifiers. I won't get into amplifier topology now, but suffice it to say... they're super efficient. 1x C10:4 (4 x 250 = 1000w) 1000 [fills] 4x C16:4 (4 x 400 = 1600w) 6,400 [high frequency] 4x C28:4 (4 x 700 = 2800w) 11,200w [monitors, fills] 4x C48:4 (4 x 1200 = 4800w) 19,200w [midrange] @ 8 ohms 6x FP10000Q (4 x 2500 = 10,000w) 60,000w [subwoofers, midbass] http://www.labgruppen.com/products/ All this is fed by a isolated power transformer that weighs in at 744lbs. Each amplifier is c…