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Thread: JBL Synthesis - Room Design and Treatment

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  1. #1
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    Roger Dressler stops by

    This is the last of my posts on Roger Dressler's visit a couple of days ago. The others are

    http://www.audioheritage.org/vbullet...l=1#post300675

    and

    http://www.audioheritage.org/vbullet...l=1#post300704

    Thanks to Grumpy's efforts in taking pictures during the calibration of the Synthesis® One Array, some of the shots were posted here and there. When Roger Dressler saw the final curve, he said he was interested in hearing it, since he imagined that kind of curve would appeal to him. He was speaking to Sanjay Durani, an avid, respected, knowledgeable, and prolific poster over on AVS, who responded, "I know that guy." So on his recent trip to LA, Roger teamed up with Sanjay and they came over.

    After letting him perceptively improve my two main floor systems (K2 and Performance Series) and making him sit through an XPL200A active bi-amp demo, we finally got to the Two Jims Theatre. When I explained the first Jim was Jim Lansing, he nodded, and when I said the second Jim was Jim Fosgate, he smiled a big smile and said he'd have to tell Fosgate about it. He'd already noticed that I had a lot of Fosgate Audionics gear, so he even suggested I take some pictures of it and send it to Jim Fosgate to prove "it's still in use and greatly appreciated by a fan."

    In the Two Jims Theatre room itself, he was very curious about the S4Ai surrounds and the Saturn diffusers. He asked a number of questions, which I hope I answered satisfactorily, and I blathered on about the SDEC units, the dedicated 20 Amp circuits, the absorber placement, room measurements, etc. When I mentioned the deliberate omission of a door in the room, he immediately commented, "It's a bass trap!" referring to the function of the adjacent room as a dump for all the excess LF.

    We finally settled in and listened to a lot of music from the disc he brought. He commented on the SAM1HF horns, wondering why they were standing on end. It was even more interesting when I told him they were designed by GT, the same guy who designed the K2 horns on the main floor. "Really?"

    "Yep." (I should have had a better answer, huh?)

    Upon first hearing, just like I did, he had to remark, they're really not horn-like at all.

    "Yep." (Gotta work on my responses.)

    We played around on the AV2 a bit in some of the music modes to see what we could hear, but of course, I kept an iron fist on anything regarding cinema or film modes. That was already calibrated, thanks.

    We eventually put in Master and Commander for the obligatory movie demo. To say he was spellbound would be underselling his reaction. As a Dolby ProLogic, Dolby Digital, Dolby PLII, Dolby Digital EX, Dolby PLIIx, etc. veteran, he was checking every nuance of presentation, spatial cues, placement, etc. During the initial cannon salvos, I swear he jumped in his chair.

    When it was over, his praise for both the S4Ai and SAM1/SAM2 units was effusive, including comments about how effortless and powerful they were, how they seemed to have no practical limits to accept power and produce clean, undistorted sound, and how incredibly balanced they were, top to bottom and side to side. When I told him it was -10 dB below reference, he was even more impressed

    His respect for the S1S-EX was abundant. That's when he remarked it was not just a pants-flapper but a shirt-flapper as well. "I've never had my shirt flap before." He made some reference to tennis balls and air cannons or something when comparing the sound he gets at home. We then talked about the subs' placement, placement in general, and the Harman International approach to sound rooms, multisubs, etc.

    Finally I had a lot to say! Both he and Sanjay commented that most of the principles of Toole, Olive, etc. were at play in the room and working to great effect. Then he commented that his own HT had little impact at all compared to this. Of course, it wasn't just the equipment, good as it is; it's also the calibration curve.

    On that happy note, we exited the room and went to lunch, where we got to talk about Dolby, Jim Fosgate, 6Axis sound, Logic7, a little about Harman and Citation, Madrigal, Audax, etc. It was a pleasant way to pass the time with a couple of really intelligent guys and soak up their combined knowledge, experience, and expertise.

    One of the better things about the day was being able to show the strength and enduring quality of JBL's leading consumer products to someone who's lifelong profession has been sound. He's a very professional and down to earth man who's quite certain about what he likes, and I'm happy/relieved that he liked everything he heard. Beyond that, he helped me make two of my main systems much better than when he came, and left me the demo and test disc to boot.
    Out.

  2. #2
    Mike Ronesia
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  3. #3
    Senior Member Valentin's Avatar
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    congrats

    synthesis systems are top noch

    you are one happy client

    or let me say an adult with very nice adult toys

  4. #4
    JBL 4645
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    Quote Originally Posted by Titanium Dome View Post
    His respect for the S1S-EX was abundant. That's when he remarked it was not just a pants-flapper but a shirt-flapper as well. "I've never had my shirt flap before." He made some reference to tennis balls and air cannons or something when comparing the sound he gets at home. We then talked about the subs' placement, placement in general, and the Harman International approach to sound rooms, multisubs, etc.
    Trousers and shirts don’t really flap. Its how they are attached to us if the fabric is stretched across tightly then chances are you’d never feel it. Maybe the in chest or in the arms legs (face and eyes) very rare! It would take a lot of vibration that is only felt not heard, done though tactile transducers.

    Some lows blow out some air that blows along the room and you feel it. You’d best bet is to watch a movie naked something like Naked Launch. No really naked because then you’re body want have any fabrics to give false readings.

    Real life gives trousers and shirt flapping at lesser db level because it is what it is natural, and that’s something a sound system can’t do.

    Wind effects in some films softer ones just don’t work, louder ones do like the desert scene in Lawrence of Arabia (1962) where one of the boys falls into quicksand and there’s a huge dust storm blowing.

    So how does it feel when naked? How does it feel standing up and sitting down in the seat? Only one JBL/THX cinema pressed on me, Wycombe6, from standing at the back with lows taping on my trouser legs, body as well.

    Must be nice having Roger, former Dolby coming over, that’s better than inviting Justin Bieber, coming over. I bet you’re not going to wash you’re hands for month now.

  5. #5
    Senior Member grumpy's Avatar
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    Think I'll use some Purell on my eyes now.

  6. #6
    JBL 4645
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    Quote Originally Posted by grumpy View Post
    Think I'll use some Purell on my eyes now.

    Oh, ouch god god man don't do that!

    My eyes have only vibrated once to some low sub bass on Brainstorm (1983) one of the scenes where it has that nightmare sequence the lows vibrated though the wooden floor and next I know my eyes going blurry for a few seconds due to the about of vibration SPL db.

    I’d say the frequency was somewhere between the 20Hz to 80Hz range thou I think the film is limited to 25 or 30Hz on the Dolby mix.

    More recently travelling on the yellow busses once a fortnight for the shopping I noticed one bus to be uncomfortable for the 20 minute trip. It was reverberating badly enough that my vision blurred I can see everything flicking when the bus stopped at bus stops. Once moving the frequency changed. Plus it was too damn loud on the ears.

    I don’t forget how it felt if I go to decent enough cinema with nicely EQ JBL with THX. (I still can remember that pinching low end) from Indiana Jones and the Last Crusade (1989) in my stomach at the Empire, 21 years ago.

    Thou there could be several reasons for that? One the system was so awesomely EQ turned and that way I was sat in the rocker 4 or 5 row from the front centre/line. It could be the tightness in the trousers around my waste? I didn’t have belt buckle sticking into me. Oh no!

    I had light clothing on my coat was laying on the floor beside me.

    So that low end I felt was from one of the LCR fronts not the surrounds as I have played the scene and there isn’t enough low end on the surrounds during the scene where Indy pours the Holy Grail water onto his, dads wound.

    There’s no subwoofer track playing at that time so one of the LCR is putting out a good pure sonic feel. It was covered by score only so one or two frequencies in the musical score will pinch you in the stomach?

    It was then I knew JBL was the Holy Grail of sound or least those JBL 4675-A ware the dogs bollocks! That's what got me hooked on JBL one film in one special one of kind cinema. Now then!

  7. #7
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    Quote Originally Posted by grumpy View Post
    Think I'll use some Purell on my eyes now.


    Oh, Lord!

    Priceless.
    Out.

  8. #8
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    A little bump

    I think this is what Tony is looking for, not the original "Something big..." thread.
    Out.

  9. #9
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    Looks like it'll soon be time for a new calibration.

    http://www.audioheritage.org/vbullet...l=1#post323551

    I'll post more here when the event draws near.
    Out.

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