DevilDriver

I greatly prefer Facebook, but I rarely check either.

Well, success will come when the money does. I'm trying to develop a good name for the company. I have a few ideas in my head right now, though.

Wow, what a shit day this has been.... Initially I was very excited. When I was 17, I lent an older friend some money to help start a business on the condition that I would receive 10% of his net profit every month when he was profitable and I would receive my initial investment in full after a 4 year term; when he wasn't profitable, I wouldn't see a dime. Well, the big day came last week, and on Friday, I received a wonderful cheque for around $5000. I deposited it in the bank account today, with the intention of: a. Purchasing an ICON and giving it a review for Aaron. b. Getting things from FEMM and FEA stages to actual production in regards to the audio company I am wanting to start. About 10 minutes ago, I received a call from the bank stating that the cheque had bounced. I got off the phone with the "friend" about a minute ago and he had to pay some last minute bills, and I should see what is owed to me at the beginning of September, with an additional $1000. So when things come to fruition, hopefully I will be in great shape. But until then, fundage is tight and my hopes of getting some stuff done before the fall semester is proving extraordinarily challenging. I'm not sure that "livid" is even the right adjective here.

That is a great resource. I would have liked to have seen a fully clipped signal track for educational purposes.

Happy birthday Nick.

http://www.quixoticals.com/2007/04/most-fr...o-mod-ever.html

Exactly. A sine wave is smooth as it is a single fundamental frequency. A clipped signal is the fundamental frequency and some higher order harmonics. When you are badly clipping, the waveform becomes square because there are many higher order harmonics present. Just to give you an idea, if the fundamental frequency was 50Hz, then 100Hz would be the first order harmonic, 150Hz would be the second order, 200Hz the third order, etc. If you have enough of these present, you have a full on square wave, carrying a large amount of power under the curve (average power over time is substantially higher). If the speaker is capable of dissipating that average power, though, there is no damage done. It will simply sound terrible. I am always surprised how much clipping most peoples ears can tolerate and think is okay as well. Ahem, GedLee metric

Exactly. A sine wave is smooth as it is a single fundamental frequency. A clipped signal is the fundamental frequency and some higher order harmonics. When you are badly clipping, the waveform becomes square because there are many higher order harmonics present. Just to give you an idea, if the fundamental frequency was 50Hz, then 100Hz would be the first order harmonic, 150Hz would be the second order, 200Hz the third order, etc. If you have enough of these present, you have a full on square wave, carrying a large amount of power under the curve (average power over time is substantially higher). If the speaker is capable of dissipating that average power, though, there is no damage done. It will simply sound terrible.

Perhaps a stupid question, but I have the agility to convert units of a law student. Is the inductance of this driver 10.7mH or 1.07mH? 1 uH (micro Henry) = 0.001 mH (milli Henry 1 mH = 1000 uH 10747.13 uH = 10.75 mH Inductive corner frequency is determined by f = Re/(2Pi*Le) f = 3.4/(2*3.14*0.01075) f = 3.4/0.06751 f = 50.36 Hz

Pleasant surprise is an understatement. Those who were very concerned about enclosure size before should be a little bit more comfortable: huge drop in Vas and Qtc .707 is about half now what it was before (down to around 3.75 cubes from around 7 cubes before). Seems very promising Mark.

Tighten up the gap, you increase B, which decreases Qes, which decreases Qts. I think I'll take some time to post about this later this weekend, but the lower Qts will lead to a smaller enclosure, assuming other parameters like Qms, Vas, and Fs (all inter-related) stay the same. When it comes to thiele/small parameters, there are only 5 that really matter, and all other parameters are derived from those. They are: BL, Mms, Cms, Re, and Sd. It's considered useless in a vehicle because of the extremely affordable high power amplifiers available. In a vehicle, consumers want a ton of output in a tiny box. How do you achieve that? Well, based on the Hoffman's Iron Law thread, we know we would probably be best to give some efficiency, keep your low end and small enclosure, and pack a ton of power on. Of course, that might also explain why car audio users damage so many speakers! Honestly, I think efficiency can be a good thing in any listening venue. Why do we need to pack on kilowatt after kilowatt when we're already getting diminishing returns? Well, it's what the consumer wants, so what's a guy to do? If only people realized what you can do with an efficient design (remember how excited people were when 95Honda from CSo did the 8 RE8's on 150W and nearly cracked 150dB?).

What is this? The Playa Hata's Ball? Lollerskates.

A single Dual 2 ohm speaker can be wired to a 1 ohm or 4 ohm load. A single Dual 1 ohm speaker can be wired to a 0.5 ohm or 2 ohm load. If you're using multiple speakers, then the possibilities grow from there.

I had a bacon, mushroom, and cheddar cheese omellette with some hashbrowns. Delicious. Edit: I am in zee chat. Feel free to join.

Or you could use AeroPorts, and either swap out PVC lengths for daily/SPL... or plug up one port for daily (to lower tuning). I did this one summer when I competed, had 4 4" Aeroports, external, and had my SPL length PVC and daily length PVC. nG True, not sure why I was only thinking slot port. Utilize several aeroports for high SPL, and plug them for daily usage. Great point Noah.

Scott, I see you reading. Please feel free to add if you have pertinent information or corrections, as you are clearly the more knowledgeable of the two of us.

Well, this idea would take some extra work, but you could try and work out a sort of variable Fb port. Build an enclosure with a very large slot port. When you want to switch to a daily tuning, add a layer of mdf inside the port (lining both sides of the port wall). It's not the greatest solution, but it is an option if you're really hard up for big numbers out of a single sub, while keeping some daily capabilities.

It's where the cool kids hang out. pssst shoot me a im, i cant seem to find you on mi buddy list I'm at work; meet me in chat?

It's where the cool kids hang out.

EBS FTW, assuming it's predominant usage will be home theatre. If it's for an even mix of stereo and theatre, or mostly stereo, then something like 4-5 cubes tuned to 20-25Hz might be satisfactory.

It's that type of thinking that creates improvements. Start imagining it, then start creating it, then start selling it. Use your ideas before someone else does.

Yup, those are the ones if Lukas has the pictures right. They won't be available individually though; you'll have to buy a full Exodus kit. Might be worth it though: the Exodus kits I have used have always been stellar. Yup, those are the new Exodus drivers. My amplifier wants to make sweet love to them. I am guessing (this is total speculation, by the way) that CSS (www.creativesound.ca) might have a similar offering in the not-too-distant future. I know Bob at CSS wants to offer kits based off of drivers that are entirely his; he won't be offering anything Exodus, so that rules out this driver; he won't be offering the Extremis (for obvious reasons); that really only leaves one alternative, and I think that's Bob sourcing his own long throw 6.5" drivers, though I think they'll be more intended for low midbass performance, based on a couple of conversations. Anyways, I think if we badger Kevin enough he might be willing to offer the EX-6.5 separately in the future. Maybe send an email every single day? Haha. I remember reading some information about the new tweeter he's working on that sounds interesting as well.

Lower Q, smaller enclosure?

Think of other companies they build for and take a wild guess.

Yup, those are the ones if Lukas has the pictures right. They won't be available individually though; you'll have to buy a full Exodus kit. Might be worth it though: the Exodus kits I have used have always been stellar.