Recent content by John_E_Janowitz

Hi everyone, I've been meaning to stop by the thread for a few days but have been quite busy with things. When people talk about SQ what should really be talked about is accurate reproduction. The goal for any speaker system is to accurately reproduce what is on a recording without altering it...

There are quite a few benefits to an IB sub. Yes, it requires less power to reach a given excursion. This means less thermal compression and also less current applied to the driver. Less current lowers non-linear distortion due to Le(i) also known as flux modulation. You also have no...

In the ideal situation you want everything to limit approximately at the same time. No point in having a motor that has much more travel but can't be used due to suspension limits. No need for the motor to limit well before the suspension runs out either. Another important aspect is that the...

I think it's important to again emphasize the difference between thermal power handling and the amount of power it will take to get to the physical limits of the driver. Thermally the AV series 2.5" coil can take a large amount of power. When we hooked one up to the wall socket that gives...

For some pretty well recorded rap, check out BEE's mixtape here. You can download the whole thing. Most of it is recorded really well since it was done in the studio I built for them. http://www.myspace.com/beehighmusic You can see some shots in the studio in this video...

Whether they get loud enough is really a matter of preference. In an infinite baffle like in a sealed box, your maximum output is determined by how much air the driver moves and the frequency playing. A pair will have the ability to get louder than most any front stage you could imagine, so in...

This may be of interest for you as it is in a 2006 Civic. http://www.diymobileaudio.com/forum/diyma-build-logs/21873-2006-civic-lx-sedan-build-thread-36.html#post685715 It is possible to do them in 10", 12", and 15". John

I just recently started measuring transfer functions and response variations due to positioning differences. If you can do it, having the woofer at the back, firing at the back of the vehicle will always give you the smoothest upper bass. This decreases the time difference between direct wave...

Apparently since you have the desire to post your response in every thread I should post my response everywhere. I'm hoping that just maybe one of these times you'll take enough time to actually read and try to comprehend what is going on here. I think just about everyone else can understand...

I think we have covered this a few times and I just don't know why you have such a hard time understanding. The 10 people who were here from the forum on saturday and heard the already damaged papermaker woofer STILL playing to 200hz. You can see the videos here as well as all the people here...

haha. just a note on the wall socket. 120V, 20A circuit. The resistance of the coil at 60hz is almost exactly 3ohm. I = V/R so 120/3 = 40amp P = 1^2 R so 40^2*3 = 4800W That may be a LITTLE too much for continuous use. PLEASE PLEASE PLEASE don't go do something stupid and throw 4800W...

A few good tracks with detailed bass that isn't heavily compressed. Duende by Black Light Syndrome. Beginning has a short bass solo with some quick notes. Good subwoofer will produce each note clearly and differentially. A poor subwoofer it sounds like a rumble that only changes tone. Are...

The efficiency formula is the amount of power that is actually transferred to acoustic power. If you notice, it's rare that any "subwoofers" ever get over even 1% efficiency. That means 99%+ is dissipated as heat in the coil. Knowing this, it is important to have drivers that are more...

Woven leads IN the spider greatly reduce the longevity of the wires and spider. As mentioned before they are formed with heat and become brittle, fray, and can spark up. There are many documented cases of this. The flat ribbon type leads on top of the spider are a good option if they can be...

I find it funny that now not only are my woofers being criticized, now the Theil Small parameters and electrical modeling that has been around since 1954 is being criticized as well. You can believe that they are not accurate if you wish and just give over everything to chance. I wish you...