Woooo....movie review time as requested......
I have a several movies to choose from but I chose Independence Day to demo.
I initially put in the DVD for a simple test and was going to move on to a couple others, but I was so overwhelmed by the movie's performance with the second sub added to the system, I watched the whole thing over again. I didn't see the need to demo others to give you the report on movie reproduction results.
It exceeded my expectations and delivered me two hours of the finest movie experience I've ever heard. My living room isn't even treated for home theater use, other than the carpet. Yep, I'm sold on the
PR design!
I've emailed Dan Marx over the years due to his expertise in the audio field with various projects. He had some interesting information for me regarding the tuning frequency of the 23hz of my subs. I couldn't beleive after Mike P. modeled my sub in WinIsd that my tuning was only 23.5hz because they get so much lower than that and are so clean. Using the visual test, I tested them at 23hz, actual.
For those of you who are trying to get your tuning hz down in the teens with large boxes and ports, you may want to take note of his recent email to me:
Quote: "I know what you mean about the majority of people lately bent on tuning in the teens. I'm not all that into it. Enclosure sizes are just to large for my tastes. Even a small (relatively speaking) sealed box with a modeled f3 of ~35 Hz can have usable extension all the way to 20 Hz in-room and sound fantastic to me. Room gain does wonders for subs. The simulated numbers, whether they be f3 or fb, don't mean much in terms of how the sub actually sounds to you. It's more just a metric to shoot for when designing the sub, and of course, most people use them for bragging rights. :-)"
http://www.danmarx.org/audioinnovation/
If you are contemplating building a good passive radiator subwoofer, don't worry about trying to acheive a mid teen hz box tuning because if you can get down in the low 20's, you will be very happy. As shown in the graph in the beginning of this thread, by using a lower tuned box (larger), you may even sacrifice some of your mid bass response.
I hope this thread will help those of you contemplating the use of passive radiators for your next project.
Mike
