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Do we really need subs tuned to 30hz??

Old 02-27-2009, 09:01 AM
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Do we really need subs tuned to 30hz??

The reason I ask, is because I noticed most pro sound subwoofers rarely deliver +/- 3dB ratings even close to 30 hz. Typically they're range is 55-300 hz. I'm sure we've all been to clubs and concerts where these are playing and I've never thought that they were lacking in bass at all. Considering we get free bass boost(transfer function) in a car, you'd think that we'd need less of a low tuning. Comments?? This pro sub for example is an 18" ported JBL unit that has 55-300 specs at +/- 3dB. I'm sure this delivers bass, but if anyone on here said they had a box that had that response, it would be good for spl, but not SQ.

http://www.parts-express.com/pe/pshowdetl.cfm?&DID=7&Partnumber=245-816&ctab=1#Tabs

Last edited by alphadawg; 02-27-2009 at 09:05 AM.
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Old 02-27-2009, 09:04 AM
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Most clubs and large pro audio speakers are woofers, not subwoofers and are often tasked with playing midrange up to the Horns cutoff. Most bigger nightclubs have dedicated 18" subs in bandpass enclosures to really reinforce the low end.
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Old 02-27-2009, 09:08 AM
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I know about the bass bins in larger venues, but even these sound good. I just wonder how much information there really is below 50 hz.
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Old 02-27-2009, 09:14 AM
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depends on the song and type of music..most dance club tracks rarely dip below the 40hz mark. I find that in clubs there's usually a HUGE gap between 120ish hz and 300hz.. Almost as though they don;t like midbass. Or the subs and horns are just overpowering the woofers.
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Old 02-27-2009, 09:16 AM
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Part of the issue in the pro-audio realm is the size of the room and the ratio of cone area to the air space it excites. A 12" woofer in a car has a smaller area to make bass in. When at your local stadium, there is so much power and cone movement to create 30hz, that it's not worth the power loss from the amplifier side, and in actuality, if your sub begins to roll off @ 12db/oct at about 50-55hz, there is plenty of low bass information for a live gig an octave down. The live sound format is not as scrutinized as the intimate setting of a car where you will pick up more nuances.
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Old 02-27-2009, 09:21 AM
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I go to alot of concerts, and the lower octaves are usually covered extemly well. too much sometimes. It pisses me off that without massively over EQ'ing I can never get recorded heavy metal tracks to sound anywhere near as good as at concert. I'm sure that has alot more to do with the recording production since 95% of music out there is recorded to sound good on crappy speakers and has little dynamic room for the sound.
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Old 02-27-2009, 09:24 AM
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I guess part of it has to do with the wave lengths too...just as we can hear low bass further away, in large rooms the bass "carries" well.
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Old 02-27-2009, 12:25 PM
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Originally Posted by Sikk Nation View Post
I go to alot of concerts, and the lower octaves are usually covered extemly well. too much sometimes. It pisses me off that without massively over EQ'ing I can never get recorded heavy metal tracks to sound anywhere near as good as at concert. I'm sure that has alot more to do with the recording production since 95% of music out there is recorded to sound good on crappy speakers and has little dynamic room for the sound.
I thought that was due to over EQ'ing at the sound board in a concert. I've noticed (and I like it too) that at most concerts they have the bass drum and bass guitar unrealistically loud - when I say that, I mean, verses an unplugged setting - the bass drum at concerts has HUGE kick compared to the snare, cymbals and high toms - and unrealistic kick because it proportionately too loud to the rest of the kick - With that being said - I love it. I wish that "unplugged" drums had such powerful bottom end. To that end, I believe that recorded music aims to be as "real" as possible.

I also think that they crossover the bass drum around 40Hz, giving it just a deep wump without all of the typical thwack that gets heard when the hammer strikes the skin (and that thwack is what I hate about 'el crappy stereos because they really emphasize the thwack, and miss out on the nice deep thump that also comes with it) . . .

Some of my favourite CDs are the "live in Concert" CDs because the sound they send to the recorder, is the same sound the send to the amps. I don't believe it is the most accurate sound as to what the instruments sound like, but it is definitely the most fun to listen to.

Last edited by maltesechicken; 02-27-2009 at 12:29 PM.
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Old 02-27-2009, 12:27 PM
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To win the 30hz chsllenge at the april 4th show it helps to be tuned at 30hz
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Old 02-27-2009, 01:41 PM
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well, I know when I cross my subs at 50 hz or higher, I don't like the way it sounds. I have a Pxa-h701 and with that, you can HP the signal pretty high and with up to a 30dB/oct slope (very steep). As I like to screw around a lot, I've tried it at every frequency and slope, and there's definitely a lot of music below 50 hz in the bass region. I think that a car's interior may boost low end output, but we're too close to the speakers to really hear it properly...we feel it more than we hear it. That's why Bobby Joe's system booming down the street sounds so deep, and why a club or concert sounds so bass heavy. We're far enough away for the bass wave lengths to be heard.
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