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I thought this would be interesting since different materials have been a hot topic recently. As in: Non-pressed paper, pressed paper, pulp, plastic, wood fiber, IMPP, carbon fiber, Aluminum, Titanium, woven fiber, poly, etc... which material would be the best to use in what application etc....

This isn't exactly a question I have, but here goes. My friend is a big physics geek and on the topic of speakers, he asked why we don't have cooling devices to keep operating temperatures low so resistance is more predictable, and less influential. I Don't really know how to answer him, could some of you throw me some ideas why it isn't a practical idea? My only thoughts on it are practicality regarding a mobile environment and the equipment needed, as well as cost. But why don't filhy rich folks use woofer coolers to take advantage of their amps? I'm interested to see what gets said here It seems cool in theory (no pun intended) Just really impractical.

ok..i've used the caluclators and figured out what the values are..but i have no idea on what to buy to achieve those values.. what i'm building.. a third order 18db octave @ 4ohm low pass passive x-over. the values for which are.. 7.9mH coil 441uF capacitor 2.65mH coil so, what do i need to achieve these values (other then the obvious..duh) i went to PE, and listed some stuff, but evidently it's incorrect. yeah, i'm being a touch lazy, but i need somone to list the part numbers and where they got them. i'd also like an explaination as to how they achieved those values (not the ones above, i'm still reading the12volt.com on that) but how they achieved getting the values i…

Welp guys.... The install im doing i would like to incorporate the sub between the amps [amp][amp] If I make the enclosure 14x14x14 i have the perfect amount of space. Just enough for the sub and just enough to fit between both amps. The box will be polyfilled, but should I do the 14x14x14 cube ? Its not like the kid needs as much SPL as he can get, just something with a lil umph.

check the linky>>> db calculator

If i build my wall do i have to deadedn the whole car, or can i just deaden the doors and half the cabin and spray the back half with sealer or specdrum

Hi everyone, new guy here. I'm a mechanical engineering student/intern at the moment and have had a passion in audio for nearly a decade now. I took it upon myself to design an enclosure for a pair of Demon 10"s for my civic hatch. I'm pretty happy with the punchiness, but the lower end is lacking pretty significantly and sounds "blown out" or "not really there" instead of "deep". I'm hoping to get some insight on where I went wrong with my design. As you can see, this is a non-traditional enclosure where the port effectively shares 4 walls with the enclosure on the outer sides. The design was done this way to maintain a specific outer dimension that fits like a glove in …

Hey everyone, I posted a thread a while ago about trying to work out the ports for an enclosure for my sub. I've spent alot of time deciding whether or not to go with a ported or sealed enclosure. I've decided to go for a sealed enclosure instead. I've been using Bass Box Pro to try and design an enclosure and I'm getting a bit frustrated Here are the specs of the sub: 15” Electrical Q Value -Qes: 0.58 Mechanical Q Value -Qms: 3.62 Total Speaker Q Value -Qts: 0.501 Free Air Resonance -Fs: 19.10 Hz Equivalent Compliance -Vas: 207.0 liters One-Way, Linear Excursion -Xmax: 54 mm Efficiency -SPL 1W/1m: 85.81 dB SPL Effective Piston Area -Sd: 810 cm^2 DC Resistance -Re: 4.2 o…

What exactly is the F3 of a speaker, and what should that number be relative to a ported box's tuning frequency, if at all? -C

Hey guyz, I know that different cones have differents advantages and drawbacks: - strength - lightness - ease of use But what I am wondering is what kind of "sound" (metallic, warm, etc...) do those have - subwoofer cones by the way. For example, hemp, kevlar, aluminum, titanium, threated paper, and so on... Thanks Kelvin

I'm going to use this to bring up questions I have or to discuss certain things I've thought about so I can get a better understanding of it. Please be patient with me though as I am still quite young. The first thought I have is about inductance. Does the cemf have much effect in the range of subwoofers? What about inductance modulation?

I am working on my enclosure, and am wondering which way to face the sub. I have 2 options with my limited space, either face the back side of the back seats, or face the rear hatch glass. If I go towards the rear hatch, I cant get much of an angle towards the glass, it would be about 3" below the horizontal line. Sub in question will be a 12" RL-p. MattB

Alright, I've been trying to figure this out since I finished the new install. The Q's and Sundown amps sound amazing, they really do. I've never had anything that sounds like they do, so deep, so accurate and SO forceful, they're really quite amazing. However, I noticed a strange phenomenon right after installation that I kind of chocked up to the fact they were still very tight. After several months of playing it got worse instead of better, and at the car show last November I discovered something interesting about the phenomenon and have been studying and working on the how and why of it since. Problem is, I can't find any good information on it. So at this point…

im building a sealed box for the well of my 87 trans am for 2 rl-p 12s. i'm having a bit of trouble getting 1.25 cubic feet for each speaker but i think i've found a way. however, im not sure if it will screw the sound up. im using a single chamber, not one for each speaker. does if matter if i have a bit more of the airspace on one side of the box? http://thirdgen.org/techbb2/showthread.php...threadid=306257 here is the link to the plans. what i want to do is extend the bottom section so that it comes over further at the bottom, where it sits way down in the well. the dimension on there that says 22 1/2 i want to extend to the left side of the box about 2.5 or 3 inches.…

I have an 02 monte carlo. the factory amp has an internal crossover to the door drivers and seperate tweeters. if i buy new component system do i discard new external crossover. i have 4 wires in factory harness and am adding an amp to power new componts. i am keeping my stock head unit for now and there are no pre amp outs.i know that new crossover should be installed wity new spkrs. but the wiring has me stumped.thanks for any help i can get.

Hi everyone, I have a dual 2ohm that is 1200 wrms and 2000 peak. Can I run a 800wrms amp or more on each vc? the sub is PG titanium elite (proven power hogs). How common of a practice is this? The reason I ask is because it seems like that application would use the woofer to the fullness of its potential. Later everyone

I guess I'm being really optmistic here, but are there any pieces of software (free, would be nice ) that accurately model horn-loaded speakers in room? I'm trying to model efficiency gains from different types of enclosures, and most modeling software comes painfully short... All the research I've done on horns doesn't give actual numbers for efficiency gains; of course, most of that is room/placement dependent, but some general guidelines would be nice to go on...

Okay, so i think i fucked something up in my 86 GMC S-15 that deals with electrical, go figure right.. Everything was working perfectly, then.. i connected my (2) D3100 XS Power batts with (2) runs of 0AWG wire (pos n neg) and something (idk what) happened and this is the results... I started my truck (got low voltage) and my Head Unit didn't turn on, along with amps. I put a test light on my 15amp Radio fuse in my fuse box by my kick panel and no power, so i pulled it and it wasn't blown but i replaced it anyway. Then put a test light on it and still no power. I pulled my Head Unit to check the factory 10amp fuse and i got the same issue, no power but not blown. On my f…

I need help with design enclosure for BMW trunk, i need to get bass to cabin. Maximum height 16" Maximum width 35,2" Check this topic to see what i have there right now: HERE Subwoofer: JBL GTO 1514, 15 inch.

just a small topic that always seems to be explained without being explained. --------------------------------------------- amplifier Gain and DMMs. Most guides that talk about gains and DMMs are a bit simplified. you may want a higher or lower gain. Obviously to set the gain you would need to ask yourself what you are trying to accomplish by setting the gain! but this is overlooked in most guides. --------------------------------------------- ** most guides assume you want maximum undistorted power output from the amp ** Q -- What's wrong with that??? A -- you may not want maximum power. ---------------------------------------------- When you wouldn't want maximum powe…

Aside from LEAP's capabilities, is there any software out there anywhere than can graph, plot, or otherwise visually show a person what happens to the response curve (from a 0dB reference line) when they would apply say an 2.5khz LWR LPF -12dB filter, or even a 3.5khz HPF -6dB filter, or perhaps have 5 bands of parametric EQ each with the frequency, Q, and level to show what the effect those settings have on the baseline. My thoughts is that it might help to show and understand exactly what those adjustments are doing, how much they're affecting, and maybe to help get a healthier understanding of the interaction between all the settings by being able to see it without s…

Not sure if this is the right section but... I couldn't find any info searching on the topic. When doing a SQ system, is something like this graph followed? Or would it make sense to setup your system to follow the graph, and adjust your EQ accordingly to how the sensitivity of the ear is for a more balanced sound? My only thought I guess is that music isn't all recorded the same, so I guess maybe this wouldn't be useful. Just a thought I had

Here is a test we did a few years back... Always surprises people... http://forum.carstereos.org/clipping-test-...41.html?t=47441 -Mike

I'm am totally lost. All I know is that houses run 8 ohms and cars run from .5 to 4 ohms. what is the difference between running a sub at say 300 x 1 at 2 ohms and 200 x 1 at 4 ohms? What are ohms exactly?

I am trying to fit this 10" under my seat in my 08 silverado ext cab, But this seems like an impossible task because its so much bigger than most 10s, i havent read or seen anyone do anything about this and im wondering if i even can and if anyones done it short of taking out a seat?