Can the shiva go LOUD & LOW (1 Viewer)

[Tyler]

Can the shiva subwoofer go as loud as a Theater sub in the cinemas ?
in a 17 foot by 15 foot room ?

 

[kevin oswald]

You should have no problems reaching reference levels..

 

[Jack Gilvey]

I don't think that there's any 12" driver which will give "reference" levels in anything but a car, if by "theater levels" you mean 120db down to 20Hz.

 

[Julian Data]

I agree with Jack here, it's going to take more than one 12" driver.
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[Greg Monfort]

>Can the shiva subwoofer go as loud as a Theater sub in the cinemas ?
in a 17 foot by 15 foot room ?
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Not even close. Cinema subs are high efficiency/high power handling, don't go very low, and are stacked/EQ'd to get a solid response to 30Hz. A single JBL sub will average 116dB/rated power in 10kft^3 from 35-120Hz, so it's 1m limit is much higher. HIFI sub drivers OTOH trade efficiency to get the bottom octave.
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>You should have no problems reaching reference levels..
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With a single Shiva, you would have to sit ~a meter from it.
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>.......if by "theater levels" you mean 120db down to 20Hz.
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Theaters now have similar reference levels as HT, 115dB average in a reverberant sound field, though few have much energy below 30Hz.
GM
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Loud is beautiful, if it's clean

 

[Jack Gilvey]

quote:Theaters now have similar reference levels as HT, 115dB average in a reverberant sound field, though few have much energy below 30Hz.

Ahh. That does bring up a question. When referring to "reference levels" in a ht environment, over what bandwidth is this 115-120db required?

 

[Greg Monfort]

The LFE chnl should be 10dB above a single main chnl 20-80Hz (-3dB) which should be 105dB peaks/listening position/20-20kHz (-3dB). If the mains can't do this, then use bass management and add 6dB to the LFE chnl according to Holman Tomlinson, or 121dB peaks/listening position, though other data at the DD website implies that 130dB peaks/listening position would be needed. This means a serious, or serious^2 , sub if you sit 3-4m away.
GM
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Loud is beautiful, if it's clean

 

[Tyler]

Thanks for the help.
So must theater subs can only go down to about 30hz ?
Yes it seems that way when ever i go se a movie the bass is loud and hits dramaticly & sure can rumble.

 

[Greg Monfort]

Unless the theater adds some infrasonic bandpass subs, ~30Hz is it. What you get is tremendous slam in the 60-120Hz BW. Up close, a JBL pro dual 18" sub will rock you back on your heels when you pot it with 800W.
GM
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Loud is beautiful, if it's clean

 

[Seungsoo Hwang]

Greg or anyone that knows, when a theater says it is "thx somethingorother" does it have to play down to a certain level/volume basswize? A lot of screens here are pushing their THX-ness...

 

[Julian Data]

Most "THX" theaters I have been to around here in NW PA.. BLOW!
Back home in VA they aren't bad.
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[Ben Yang]

I agree with Julian. Most theatres do NOT go as low as a decent home theatre, eventhough they can be very loud. Just saw "knight's tale" in a new digital theatre which boasts state of the art sound and picture, leather stadium seating, beer / wine, real food. Called the club theater at the General cinema in Washington DC. Great seats, great picture, excellent sound quality, but not sure if I heard ANYTHING near 30hz. Deepest bass I could tell was in the 50's. Could be the picture itself, but the sound effects were pretty amazing. My shiva goes very deep and low, even better now that I corrected the phase.

 

[Greg Monfort]

THX sets dispersion patterns, etc.. Frequency response/loudness is Dolby. Dolby SR-D is 20-20kHz (-3dB), and I imagine very few theaters are setup to do it as it's very costly equipment wise, and requires the theater to be be a stand alone building.
GM
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Loud is beautiful, if it's clean

 

[Julian Data]

Hey Greg,
Ever heard of the D-Box?
http://www.d-box.com/
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[Shade Watson]

Julian,
The Intro to the Mini-Mammouth states that it is inferior to any other subwoofer. Who would want that?!

 

[Greg Monfort]

These remind me of the units used at some amusement parks. I liked the big subs bolted to the floor for "Earthquake!".
GM
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Loud is beautiful, if it's clean

 

[Julian Data]

Shade,
I was just referring to the motion simulator.
I haven't read anything about their sub.
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[Shade Watson]

Julian,
I was just making a joke about their misprint. I'm sure they meant superior rather than inferior.

 

[Julian Data]

Shade,
np.
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