The Tube Doctor

Since its the Dual 1 its .7 per coil. Wouldnt a 2 ohm load from the amp effect the 1.5 coming from the sub? DCR (voice coil winding resistance) is always lower than rated impedance. Rated impedance is an AC measurement. .7ohms DCR sounds about right for a 1 ohm speaker.

So does this mean that we can expect a rebirth of Linear Power? Older models revisited, or some new and exciting stuff? I've used (and loved) their amps since the early 1980's. Built dozens of demo and comp cars with the IQ series in the early 1990's, (lots of active systems, mulitple 5002 for subs, etc) and even managed to bring a limited quantity of product over to my new locale (Hong Kong) up to about 1995. Where do I sign up? Still have a 4753iQ, waiting for repair...............

Absolutely agreed on that one. This type of woofer will not look right in a box model program but works great in suggested box from IA. So, as a long-time LEAP/LMS user, I'm curious about the WHY? I've been on a couple of other forums related to SPL-specific car audio woofers, and have seen this same information time and time again. What specifically is it about these types of woofers that causes them to confound modelling software? And what exactly turns out wrong when using something like LEAP? I confess that I haven't taken the time to model these drivers (yet), but I'm intensely curious about the results. I will, given a bit more spare time, make an effort to plug in and run the numbers. It would be greatly beneficial to hear from those board gurus and regulars, so that I might be able to make some changes to the way I run my numbers. Thanks.

I've been using LEAP since back in the days of 5.25" floppies, and the need for an 80287 math co-processor. It allows you to accurately change the spacing of ports and speakers, and gives graphical information on the results of your spacing. Also shows group delay (port ringing) and allows different fill densities to be explored. With the more recent versions of LEAP (4.xx) you can model your car's interior volume as an acoustical filter, placed in front of the speaker enclosure, to determine the woofer system's response as it will occur in car. Find someone who has LEAP, likes a few cold ones, and make a new friend! The results will eliminate a lot of the guess-work from your build. With the amount of time and money I've seen people on this forum spend on their systems, a few like-minded folks pooling the necessary $ together for a LEAP system would be a modest investment, that would make a huge difference for the system builds, before even one sheet of MDF has been put on the saw.