Technical Info & How To's

What tools and methods do I need to calculate my imp rise. 1 15" AA SMD, Sundown saz 3000d. 4^3 @ 31hz, 30^2 port area (I know way to small, just testing an aeroport). Sub wired to .75 ohm Just got a clamp meter today and messing around I did 18.4 amps & 79.8 volts @ 37hz. I want to know what the impedance is doing but not exactly sure how to check for that Thanks

How do I mobile phone post pics to the forum?

It has been debated rather hotly for years, and now it has become pretty much accepted that MP3 and sound quality do not mix. But why is it? Why do some people hear so much loss in their systems and others don’t? Are my old ears really better then someone 30 years my junior? Someone who still has a large amount of their hearing range left, while mine has deteriorated over the years should be able to hear these losses better then I! I started with home tower speakers in the back seat of my old Delta88 back in the days when we had no real systems, and we still had post mounted tape decks and 8-tracks. Then times changed, and we started putting in tape decks with trunk mount…

Copied mostly directly from Jl audio.

I've never built a box and need help with a step by step process or blueprint on building a box wanting it 5.2 net cubic ft and tuned for them low lows I've gotta Chevy blazer 4 door to put it in and wanting subs to face up towards roof and port to face the back hatch. I've got two SoundQuebd HDS3 12's I'm putting in it. gunna b for everyday and mild comp bas. powering them with a 1200.1 super d class Zeus mono amp with big 3 upgrade and 0 gauge ran. please someone help me

Hi Guys, Hope you are all well and i aslo hope that some one can assist me with working out the correct spec for a true SPL box. please note I will only be doing SPL with this box. Ok so I have 18mm ply wood, 1 12inch subwoofer, 1 amplifier and 1 battery. Here's what i'd like to do Get a minimum of 151db's from this setup Equipment DD Z1a NSB 170 12v Targa TG301-DW The sub specs are as follows and i could be wrong because this is taken directly from the site. 12" COMP SUBWOOFER - DUAL 1 SPECIFICATIONS Fs (free air resonance): 48.7 Hz SPL (efficiency, 1W/1M): 89 dB Nominal Inpedance: 1/2 Ω Qts (total speaker…

So I have a 15 FI BL and 1200 watt Hifonics amp, when i turn my bass knob (volume) up to high my amp goes protect. I know it's not an amp problem because my friend had the this system for a while in his car and it didn't have this problem. But anyway i've rewired, and adjusted the amp many times and i'm clueless. any ideas? please help me out.

How do i properly wire my 4 ohm subs to 1 ohm? when I've done it in the past with my audiobahn flame q's my fosgate hx2's and my cvr 12's you would always get that electrical burning smell and subs would get really really hot in the center of the top please help me cuz i really dnt want the same problem with my new soundquebd hds3 12's i bought a 1200.1 d class Zeus amp so i won't be over powering them cuz subs r 1200 rms so i want to wire them at 1ohm so i get the 1200watts and b slamming greatly appreciate all the input if u can please help me I've watched the how to videos on YouTube but still got that funky smell please help

I am going to install a sub/amp in a 2000 Accord EX this weekend. Has the factory CD player in it. Does anyone know if that will have a power turn on/powered antenna output to switch the amp on/off? I don't want to wire a switch or run it off ignition... Also, no PAC TRUNK-LOC or anything like that in the build, amp has high level inputs, and that is all it will get... Any help would be appreciated guys... -Mike

I've never built a box before and i dnt want to pay close to $400 to have one made I've got a Chevy blazer 4 door and i just bought two SoundQuebd hds3 12's and I'm needing help to get the perfect 5.2 net cubic ft box built I'm going for the low low bass so tuned to 32-30hz and want subs to face the roof and port facing the back hatch door needing help with blueprints or step by step cuts and where the pieces go. can anyone please help me? Im powering them with a 1200.1 super d class mono Zeus amp with the big three upgrade and 0 gauge wires ran

Dr. Albert Neville Thiele passed away at age of 91. http://www.audioprointernational.com/news/read/obituary-neville-thiele/05165

I just found this link, you guys should check them out if you get a chance, lots of cool differnt tones and sweeps Test Tones Link

So I ordered a new tool for the tool box, and received it in the mail today. And the tool of the day is: a Vellman HPS10SE O-scope Now how exactly do I go about using it? (altough it has an auto fucntion) I'm pretty much going to be using it to set gains at work and at home on my own projects. I have all the test tones one could need thanks to AutoSound 2000. Basically I need to know how I hook it up to the amp to measure the wave and what should I be using as a load? I've heard/seen of resistors (dummy loads) or reactive loads (speakers). I would assume that using the reactive loads would be better, but I have been known to be wrong before. There is a centre pin and wire…

I know a few people who ask me or ask others about this so I thought it would be worth posting up a link that lays them out in a simple fashion. Motor Designs Underhung and Overhung

why cant i upload pics...it says that the physcial memory is exauhsted? any admins know whats wrong.

I'm going to try to make this as simple as possible, there are only certain way woofers can be wired. You cannot wire them in anyway you choose to any ohm load you choose. There are rules to follow with Ohm's Law, which is why it's a Law and not a suggestion. I have seen it a few times in the last 2 days, where people say they will wire them in two different way with only one being possible, and it is very annoying, and no ones seems to want to point it out. So, I will try to make a simple list of basic woofer voice coil configurations and the only ohm loads you can wire them to. And for the noobs "Ω" is the symbol for Ohm Single Dual 4Ω woofer: Parallel 2Ω - Series 8Ω …

i am looking at getting Two Sundown Audio SA-12 D2s and i am wondering if i should get them 4ohm or 2 ohm and i was wondering if there are any amps in the 200$ price range that can power them good to make them hit. they will be in my single cab GMC sierra and i am wondering if anyone has heard these subs and if they are LOUD i am looking for LOUD pls help me!

Hi guys I was wondering whether standard polyurethane or a UV activated resin would be better for applying directly to MDF wood in order to protect it from the elements of rain ice and snow basically is one product more durable or reliable than another with respect to weather-proofing wood thanks

Hello I am having problems with the JBL GTO 1514D. I have made the enclosure to the jbl specifications. It is in a 3.45 cube box with a 4 inch PVC port that is 13 inches long. However I am getting a LOT of port noise, which makes the audio very dirty. I am using this subwoofer in a home audio application. When building the box i used liquid nails to seal the joints of mdf boards, and I also used 1 5/8 coarse thread drywall screws. After this was completed I coated the inside with fiberglass resin to fortify the interior. The sub is recessed and down firing with a back facing port the amplifier is also on the back. These cutouts have been sealed with silicone, as well as…

Kent asked for this a while ago... I dug up some links. Enjoy. http://audioforum.termpro.com/cgi-bin/ubb/...ic;f=8;t=021625 http://forum.soundillusions.net/showthread.php?t=45647 http://hyperphysics.phy-astr.gsu.edu/hbase/pfric.html Good reading, good points, easy read. -Nick

Running 4 Fi audio ssd 18s at the moment and now I'm trying to decide and get ideas if possible to run 6 or 8 in my 99 tahoe. Any insight would be greatly appreciated. Thanks!

Power compression is a topic that is rarely discussed, but always important. When you hear someone call various theile/small parameters a “small signal parameter”, the implication is that with larger signals (more power), there will be a shift or change in these theile/small parameters. This is what we call power compression, and occurs in 3 potential ways. The first thing to consider is how theile/small parameters are derived. There are 5 basic parameters from which all other data is extracted. These parameters are Re, BL, Mms, Sd, and Cms. So looking at this from a mathematical standpoint, a change in any of these parameters will cause a change in all other parameters a…

I recently have taken out my Fi Q and put in another sub to test/listen to before sale. During the uninstallation of my Q I fussed with my amp / tightened conections/took rcas out but not power or ground wire/ lifted it off the amp rack exc. Upon reinstalltion of my Fi sub when volume gets high, the sub seems to be skipping out on hitting its notes/ skips. I was thinking off the bat that it was my rcas gone bad, as it has happened before. Another side of me thinks that its my electrical, maybe one of my batteries is dead and is only kept charged by the rear battery. I have a horrible but operating set up -to regular starting battery 4 gauge to battery in back which i…

I went out to my car today to run the big 3 and realized that the hot wire that runs from my alt to the battery is a plug not a regular wire like most cars... How do I run that now? The car is a 94 dodge stealth r/t

So im helping my buddy hook up his little system but ive come to a blank.. he wants an amp for his sub then an amp for his speakers. ive done this type of installation only once and i think i got lucky but ill get to the point, um how do you wire two amps in one car ? so to my knowledge, pos and neg from battery to distribution block, then two pos and neg to the two amps. right? for the headunit im also a little confused, both amps only have inputs so how do i split the rcas? im guessing some type of wire splitter for those and both amps have two inputs? and for the remote, do i use a distribution block for that or is it possible to put it in one amp and then to the o…