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Selecting Subwoofers for Dubstep and Drum and Bass
As a concert producer, I am often asked what subs I would recommend. Subwoofers, like mains, are selected based on the type of music you will be playing and how they will be used. For the purposes of this article, I will restrict the conversation to Dubstep and Drum and Bass only.
Dubstep and Drum and Bass have a lot of content in the 20Hz – 50Hz range, and if you do the math, you’d need about 5000 watts dedicated to that frequency range to produce enough of that sound to be heard along with the rest of the music.
My biggest setup is (5) QSC HPR181’s at the front of the stage, (6) Martin Blackline dual 18’s for house and 2 Bag End Dual 18’s running 8000 watts through a dedicated ELF processor in the range 8hz – 50hz through a laboratory group. amplifier When I do smaller shows I just use my QSC HPR181’s which are 700 watts each but good for really high volume bass. The QSCs are self-powered and take 5 minutes to set up, which also helps. Now I’ve heard the common wisdom, don’t mix subwoofers, but in reality, I’ve yet to find a sound manufacturing company that does it all, short of a touring package that’s produced for a specific show, rather than a type of music (an important distinction). That said, crossover points and keeping each subwoofer and the overall system in phase is very important when mixing subwoofers.
Conventional crossovers, such as the very common dBx DriveRack PA, have a good, fairly adjustable crossover that also includes the ability to change the tilt of the roll. When mixing and tuning subwoofer frequencies, I’ve noticed that even though the crossover claims to have turned off a frequency, some of the content is still being transmitted to the subwoofer. Clearly, when two brands of subwoofers generate the same tones, distortion is created. So I separate the frequencies by about 5 hz. Visually in the crossover, it looks like I’m losing musical content, but with the gain, I’m actually not, and an RTA mic will confirm that the setup is correct.
Sealed box closures and subharmonics
Bag End really is the place around here. There are other subsystems that do subharmonics, but Bag End was the first, so I’m writing about them. The Infra processor, and before Ron Wickersham left, the Elf processor are the two key components. Dubstep and Drum and Bass require a huge presence in the 20 Hz – 50 Hz range. Most people can’t hear music in this range, but you can hear it and you can feel the difference between 20hz and 40hz when the signal is clear and without clipping. The Infra processor is available in two forms. The first has a flat response up to 18hz, the second up to 8hz. 18 Hz is much more efficient for larger systems. If you have an extra 20k to burn, go for the 8Hz integrator and (4) 18 duals. You will need a substantial amount of AC power to run the amps, typically an additional 20 amp 220 circuit for a lab group or four 20 amp 110 circuits for four QSC amps connected to each sub. My Bag Ends generally pulls about 3000 watts per 18 dual when generating content STRICTLY LIMITED to the 18hz to 50hz range. I should note that tweaking your crossover at full volume can quickly destroy all of your gear, so be careful and know your gear’s frequency response and power handling ratings.
Subs vary wildly in price. In the lower price range, I’ve heard Peavey’s Black Widows, which are technically noisier, but far less musical. When you’re mixing two tracks or switching quickly from one to another, it’s hard to hear much of a difference with the Peavey subs, they’re just loud, not that musical. The JBL and Cerwin Vega subs are fart cans, and I think most people know that. They can rumble and shake, but they lack an articulate sound: a clarity in the bass that is absolutely necessary for Dubstep and even more so for Drum and Bass.
Some other gear I’ve tried, if you’re rich, the audioteknic Q2 D&B subs (not the db technologies) are killer, the EAW 218z subs are pretty good, McCauley makes a pretty decent sub with good specs for Dubstep and Bag It just kills . However, all these cabinets require extremely expensive amplification. You can get 12,000 amps alone before you can fire up a medium sized system of this caliber.
Another alternative is to build your own box. This is not a project for beginners, but if you love woodworking and have $2500 to spare, you can build some pretty amazing cabinets. The best way to do this is to go to the forums and look at the designs and then read the threads. People often post reviews over the years.
Look for a design that has good frequency response up to 40 Hz and a driver that has exceptional frequency response. OHM (brand) is a pretty awesome driver, and there are a couple of high-end RCF subs that are bad to the bone.
Listen to them before you buy if possible using a parametric EQ and turn off all frequencies except the 20hz to 50hz range, this is the sweet spot of Dubstep that makes it really different from other similar music .
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#Selecting #Subwoofers #Dubstep #Drum #Bass