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Post by chrisbee on Jul 19, 2009 2:39:12 GMT -7
hi Chrisbee. what kind of spl are you talking about? my room is 40 square meter and the listening seat will be 6 meter from subs but close to the wall so there will be boost of that. would i get 110-113db with 4 of these? Impossible to say with any degree of certainty. There are so many variables. Though I would guess not on LFE programme material. Which is not the same as sinewave testing which is easily possible at much higher levels. I managed to find the audible limits of four AEIB15s on some action films sitting at only 3 metres from the manifold. The AE's have similar displacement to the JBLs but may not have hard physical end stops. (Relying on the suspension to limit extreme cone excursions) Where Xmech relies on hard stops the drivers may have a short life if you intend to push the SPL limits so high on films. The more long throw cone area you can afford the higher the safe headroom. I spent more than a year working slowly up to the listening levels I enjoy now. I could never put on a new film with complete confidence that I could listen at any level I chose. I would watch the drivers on every unexpected peak with trepidation. The problem was that I often hired up to six new films every weekend. Nobody wants to listen once at a safe level and then immediately watch the same film again at "normal" SPL levels having checked out the worst signal peaks on the film. Then there was the problem of LFE getting more extreme as new films seemed to be competing with each other. Directors don't flag that a sudden violent explosion is about to change our lives and that of the characters on the screen! There'd be no shock value! Eventually I learned to relax and stopped worrying about driver excursion. I had discovered the performance envelope of my drivers by extensive experience watching literally hundreds of films. My hybrid analogue stereo/surround system does not have the usual AVR reference level +/- graduations. So I never really knew how loud I was listening without using an SPL meter. Some CD players will quickly scan a whole CD for peak sound levels. I really think this ought to be a standard facility on DVD and Blu-Ray. Particularly as LFE keeps pushing the boundaries of what is possible to reproduce safely at reference level. Nobody would put up with cars which could not manage motorway speeds without blowing up! Why should we have subwoofers which cannot manage reference level on standardised LFE "fuel"?
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Post by back on Jul 19, 2009 6:03:44 GMT -7
thank you.
the problem is not only the cost but and the space.
8x15 is too much
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Post by back on Jul 19, 2009 10:21:02 GMT -7
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Post by ThomasW on Jul 19, 2009 10:50:16 GMT -7
From the looks of the surround the claimed Xmax isn't possible..unless they're posting the 2-way stroke, or Xmech. And even then it appears optimistic.
But who knows? Without hands on experience it's impossible to know. So if you want to be the alpha tester give them a try...
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Post by back on Jul 19, 2009 11:11:42 GMT -7
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Post by ThomasW on Jul 19, 2009 11:13:39 GMT -7
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Post by wingman on Jul 22, 2009 14:55:14 GMT -7
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Post by wingman on Jul 22, 2009 14:59:15 GMT -7
I know them well and there Xmax is more like 18mm one way. But other why a great driver.
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iansr
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Post by iansr on Dec 29, 2010 16:35:20 GMT -7
Wingman I'm in the UK and looking into installing some IBs. Can you report on how those JBL drivers are working?
(Its relevant to mention I want the IBs for a 2 channel hi fi set up, not HT. If they go down to 30hz I'll be happy, anything lower would be a bonus. I'm going to have 3 sub sources as per Earl Geddes advice. Two will be IBs and the third a Velodyne DD 12 I already have.)
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Post by ThomasW on Dec 30, 2010 7:25:12 GMT -7
Wingman hasn't logged onto the forum since Nov 27, 2009, so it's unlikely he's around to answer your questions.
On internet forums no news is usually good news, since problems of any kind tends to make news in a hurry.
If the budget allows I recommend going with the Fi IB drivers.
All IBs go significantly lower than 30Hz.
In most instances people opt not to keep their box subs since they tend to downgrade the sound quality once IB subs are operational.
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Post by moonfly on Dec 30, 2010 11:31:44 GMT -7
The Fi IB318's are currently unavailable by all accounts. Fi are running low on parts and will be redesigning the IB3 pretty soon. You may be able to get some, but you'll be lucky and may have to wait.
AE will ship to the UK, but they are having supply issues that stop me short of recommending them at the minute.
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Post by FOH on Dec 30, 2010 11:42:36 GMT -7
I'm glad I got mine when I did. There's certainly other options, but none so attractively priced.
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iansr
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Post by iansr on Dec 30, 2010 12:46:57 GMT -7
I'm glad I got mine when I did. There's certainly other options, but none so attractively priced. Which drivers were you referring to please?
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jcnes
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Post by jcnes on Dec 30, 2010 16:54:28 GMT -7
I didn't use the GTO's , but I have 8 GT5-15's installed in my setup. These are actually a step down from the GTO's. I have no complaints. They have an fs of roughly 27hz, and in-room response goes below that. Anyway, go with the Fi's or AE 15's if you've got the money, but IMO, don't hesitate to go with the JBL's if your options are limited.
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