Post by
Looneybomber »
https://forums.nicoclub.com/looneybomber-u14304.html
Wed Jul 01, 2009 5:34 pm
Alright, the car is washed and waxed, I even got to use my new Uber microfiber towels and raggtop protectant. Pictures tomorrow in the day light, I had to finish via lamps run outside with extention cords.
After that 70min mix, I checked the peaks on my spectrum analyzer. Mind you, I did not have it at full volume. My neighbors would not appreciate that.
20hz = -19.5db22.5hz = -19db25hz = -17.5db28hz = -18.4db31.5hz = -15.8db35.5 = -13db40 = -10.6db45 = -11db50 = -11db56 = -11.8db63 = -11.7db71 = -12.9db80 = -17.4db89 = -18db100hz = -20.9db112hz = -24.4db
My crossover is set at 80hz
So, with 40hz being the highest at -10.6db, an octave below it, 20hz is only 8.9db quieter. That's quite loud for most genre's. Dance music typically has little content below 40hz
This is the problem with dubstep, folded horns are the norm in PA systems, or stacks of ported 18" woofers with 8-10mm xmax (linear travel). That content below 35hz requires a whole other kind of subwoofer than what's typically used. The folded horns either need to be increased in length or scrapped for tapped horns. Those vented bass bins need more hardcore subwoofers tuned a bit lower, but that also requires bigger amps, increasing costs and power requirements.
Talking strictly physics, if a woofer could produce Xdb at 40hz, in a sealed enclosure, if you wanted to produce Xdb at 20hz (one octave lower) the speaker cone would need to move 4x farther. So if it only moved 5mm at 40hz, it'd need to move 20mm at 20hz.
This is why we're seeing more capable PA subwoofers being produced...well this isn't the only reason, there are a lot.
Anyhow, this mix was good, but not great. However I have no idea why and have no constructive critcism. I must attribute it to the bad mood I was in while washing my car because i started so late in the evening and felt rushed.