Quentin Jarrell

thanks, I think we will try the MCM/Vifa system.

The quality looks like the price. You can see gaps at the mounting area. And they look awfully close to the dash. I'd be concerned about then rubbing.

Planted 1/4 acre of Mirai today

http://www.soundsolutionsaudio.com/forum/topic/58598-cheap-bookshelf-m5-impious-tirefryer-little-help/

Per your goals you do not want a bandpass enclosure.

http://www.parts-express.com/pe/showdetl.cfm?partnumber=300-643 Found that on parts express. With the crossover parts. Pretty damn cheap

My little sister is wanting a cheap little set up. Nothing fancy just something cheap and sounds halfway decent at normal listening levels. Her room is pretty small so Imaging is not a concern. She would be happy with something off the shelf from Walmart but she wants me to help build something that is hers. I'll more than likely buy a small 4 channel amp from parts express and build the crossovers and add a 3.5mm plug so she can hook her Iphone to it. I was looking at these Dayton's they are pretty cheap about 20 bucks a piece: DC28F-8 and DC160-8. My question is would y'all recommend anything else that's around the same price range. My knowledge of what's available is quite lacking. The resonces of the mid and tweet are below per Dayton's website.

I'd agree with Impious's above statement. Without a listed creep factor there is no way to calculate shifting parameters. We could all blindly assume but there is no way to know with out large signal parameters listed. This below quoted from TC: Standard small parameters, power and motor specifications listed below. These parameters are only a guildline to system design and expected response. Some of the parameters such as the Qts will shift with heat or excursion by more than 20%. There is no reason to model or expect exact constant parameters because of these natural non-linear shifts. There are too many factors involved with the different types of materials and designs used in both drivers to guestimate parameter shifts. without experience one can not guess creep factor in the surround of the TC versus the surround of the SSA driver. The TC has a "linear" spider. The SSA sub I believe is advertised as progressive however it is pretty linear. The TC has a lower rms rating however it is rated per Klippel standards. The TC has a pole vent however the SSA has a good bit of pole work that will also minimize compression. There is too much to guess upon. You just have to go by what the manufacturers give you or spend 150 bucks and have Klippel testing done yourself. But when it comes down to it it obviously doesn't matter to car audio folks. If it did then all of this info would be standard information listed by manufacturers

There is great debate on using small signal parameters for heavy damped, high xmax subwoofers, and for obvious reasons once the differences are show. For example my Ethos sample has a Fo of about 38 hertz and a vas of about 14 liters @ 2.83 volts. With this small signal the cone moves less than 1 mm. Now at 40 volts, within it's normal working range, it has a Fo of about 28 hertz and a vas of about 21 liters. Given this info we can conclude that if we were going to build an enclosure with a particular response using small signal parameters it's not going to perform as intended in the real world under normal stroke. Both Klippel and Vance Dickason recommends modeling using large signal parameters. Every driver that Vance tests and simulates he does so using 1, 3, 6, 10, 15, 20, and 25 volts. You can clearly see the differences in spl vs Freq and Excursion vs Freq from small to large signal shown in his graphs. Progressive spiders do play an audible roll but I highly doubt the untrained ear would be able to tell the difference. And most would say it creates a more desirable warmer sound. Most engineers will use a spider with a slightly higher creep factor to control cone movement in ported alignments. However most companies' drivers you see are not progressive. Just because their spiders have smaller ridges by the former than the spider landing does not make it progressive. I use a progressive spider that has a sharp "v" ridge towards the outside of the spider that is a "breaking mechanism" for lack of a better term at the spiders xmax (50% cms is considered 20% distortion caused by the suspension including the edge).

No as already explained it won't reduce over all output. If these are on the same amp the only way the two combined is not louder than by themselves is that they are wired wrong.

And the coils shouldn't be that different if they are in fact the same coils. That is a good bit of difference in wire length or wire size from .8 to 1.1

Use a battery and pop the wire from amp and make sure both subs move out. Make sure both coils on each sub is hooked up and hooked up corectly.

SP4 SQ sub FS 24.7 This thing goes low. Deep bass! Spl: 87.8dB 1W/1m 3000w RMS this woofer has lots of power but its not efficient so it wouldn't get nearly as loud as the other woofers listed above so.. I didn't list it as a part of the list. I would compare it to a evil, xxx and other subs like that. I haven't a clue where you get all your information. But I would forget everything you think you know. Go back and read all of the mandatory noob threads. If you keep giving all of these ignorant questions and answers you are going to get much much more help around here.

All amps chassis are heatsinks. And your sub's xmax is rated at 20% THD so the 1% amp rating is worthless.

You'll get used to it. But it'll soak into the car interior and new passengers will smell it for weeks.

I'm betting there is a short between the seat and steering wheel

1.34 ohms? I have never seen a sub with an impedance 1.34

All the ships I am on are anchored mid river or docked at an elevator but dealing with the massive amounts of weight we do, when shit goes wrong it' snot a pretty sight. There is a lot of traffic here and the river moves about 10 miles per hour when it's up. In the past five years I've seen three dead bodies pulled out of the river and helped pull two live people out of the river that has fallen off floating cranes. I've seen a floating crane fall of it's turntable, and saw a longshoreman get decapitated by a moring line.

It was definantly an oh shit moment as there was literally to where to run to. They had one a few years back hit the concrete board walk in New Orleans (actually about two miles down river from where I was at) and fuck up lie 200 feet of the board walk. This was after the ship dropped both anchors.

Had a nice GoPro moment earlier this morning. A 850 foot long loaded oil tanker came within about 50 feet from slamming into the birthed Panamax I was on. I was checking the hold on the ship when I started hearing the ship's horn going off. I stood there for a minute or two looking trying to figure out what the hell was going on then one of the ship's crew said to run the tanker coming down th eriver lost rudder control. Luckily the elevator I was at has two births and the other vessel there was complete and there were harbor tugs right there waiting to pull that vessel off. If they were not there the tanker would have slammed into my vessel. Sinking it and more than likely killing me, the crew aboard the ship I was on and the people on the dock. The tanker was loaded so it was more than likely around 90,000 metric tons moving about 13 MPH.

I can only assume their stuff isn't used in car audio is due to copyright fees. I'm like you it seems like a no brainer. Then again MMAG is a no brainer when it comes to high xmax linear motors. Besides the older Storkers I can't recall any car audio companies besides the UL that used it. It is used by a handfull of high end pro audio companies. Just like David Hyre's XBL, I guess the bean counters can't justify the fees or most engineers are just dubious to the technology.

unhook one of the rca's (left OR right) and see if it's louder

If you used a pac adapter and tapped into the canbus wires then you turned a 2 volt signal into a .2 volt signal. That's why it's not loud. And asuming you don't have it out of phase. The PAC guy either didn't understand you or he is full of shit. If you have the polarity of the left and right channel out of phase they will null the signal.

http://quarter-wave.com/

To be honest with you I never really put much thought into the technology. I mean who really thinks of a shallow mount sub as something they really want to use. I knew about it (this is an Enrique Stilles / STEP patented technology) just never played around with it. Until last week when the ole lady told me she wanted to add a bit more bottom end in her car (she's deaf although she has a cochlear implant) she likes a bit more bass than normal for normal listening. But she didn't want to lose any trunk space. So I went back to the plethora of info I've gathered from Enrique and Pat. Started doing a little FEA modeling and found out holy shit I can get 30mm xmax under a truck seat.