Recent content by JohnEJanowitz

I had a customer run me through a bunch of hoops because low carbon steel wasn't "good enough" for what he wanted to do. He wanted something better. Material wise there are some Iron/Cobalt alloys like the Carpenter Hiperco50 and Hiperco27 that on paper look good. The 50 isn't machinable, and...

With the full copper sleeve around the pole, any eddy currents are instantly shorted out before they have a chance to do anything. This only works if you have a rigidly affixed highly conductive material on the pole. Copper, aluminum, or other materials can all work. The thickness required is...

The only standpoints where you could make a claim for one being better than the other are in terms of amp damping factor and heat. As the impedance is lowered, the damping factor of the amp is also lowered. In most amps the damping factor is well high enough that it doesn't make a difference...

BL linearization is a good thing. I'm not at all trying to downplay the Stereo Integrity woofers nor was I trying to debate against someone buying them. Nick is a good guy. There is however no perfect motor, and there are unfortunately by products that are not good in the way BL linearization...

No offense taken. The basics of it is to measure the transfer function is to take a sealed woofer, measure the response outside the vehicle and then again inside the vehicle. The difference is the cabin gain or transfer function of the vehicle. You can do this with measurement equipment or...

Our ears can't physically hear it, but we can feel it through bone conduction. Much of our low frequency "hearing" isn't heard through the ear canal. Plug your ears when at a fireworks show. The low frequency information is still there. John

No problem at all. The particular woofer I'm talking about is more of a midbass woofer. We use them in PA systems, studio monitors, large home theaters, etc from say 45Hz on up. The high bandwidth up to 4KHz gives a lot of room for crossover and allows for lots of options to mate to on the...

subsonic technically means slower than the speed of sound. Infrasonic is technically the word you're looking for. We have lots of people doing some serious SPL's down to 10Hz in home theaters with IB subwoofers. http://www.aespeakers.com/phpbb2/viewtopic.php?f=14&t=1624 Look around on...

The page we have up on the Lambda motor also discusses underhung motors and the benefits of the underhung. It's on page 2 of the paper here: http://www.aespeakers.com/Lambda001-2.php Three main benefits of the underhung are: (1) The flux level is the same as long as the VC stays in the gap...

95% of all break-in will occur the first few times the suspension is stretched to it's limits. The main thing you are doing is loosening up the phenolic on the spider. Foam surrounds soften slightly, but not a whole lot. Rubber surrounds don't change much at all. We play all woofers off the...

When measuring the resistance, you are measuring the DC resistance of the coil. DCR should always be lower than the nominal specified impedance of the coil. Our 8ohm coils range from 5.5 to about 7ohm DCR. Our 4ohm can range from 2.5ohm up to about 3.5ohm. Many of the big commercial car...

kinda late to this thread, but here are a couple other links about drivers and "clarity." When I think of clarity, a lot has to do with low distortion, a lot with the proper alignment for the application. As Electrodynamic posted the link, this applies to the so called "acceleration factor" of...

If you want sound quality hands down, first you need to take some time and determine what you really need for your vehicle. Sound quality really depends much more on the overall system than the woofer alone. Measure the transfer function of the vehicle (cabin gain) first and then you can see...

There has been a lot of mention on motor designs so I figured I would throw this out there. I finally got a chance to somewhat format the information for the website. This goes through talking about one of the biggest distortion issues in woofers that is typically ignores. The issue with...

The thing to look at with the patents is the validity of purchasing them. I really like the eclipse style frame, but the patent was in 2001. I'm not sure when it expires. If it is a 7 year patent, kinda makes it irrelevant now. The vendor in china will sell the frames as they were never paid...