Pictures of your speaker system

Discussion in 'Speakers' started by Cspirou, Nov 6, 2015.

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  1. restrav3

    restrav3 Likes Audio-GD

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    [​IMG]

    I literally prefer this to boobies:
    [​IMG]
     
  2. spwath

    spwath Hijinks master cum laudle

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    I may just be a horny college student, but women (and boobies) are always better than audio.
     
  3. Lou Casadonte

    Lou Casadonte Friend

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    That will pass.
     
  4. mitochondrium

    mitochondrium Friend

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    Women and boobies don’t tend to come as sepetates according to my experience, the right woman (mark the singular) beats most of all other things.
    Am I surprised that @restrav3 prefers tubes to boobies? Looking at his avatar I guess tubes may be more useful to him.
     
  5. restrav3

    restrav3 Likes Audio-GD

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    salient point.
     
  6. Xecuter

    Xecuter Brush and floss your amp twice a day

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    My neighbor asked me if I wanted these JBL112 or if I could sell them for him.. Got the day off today so having a nice morning of ABing and am pleasantly surprised by these old school jbl. These were an upgraded version of the JBL 100 with apparently beryllium coating on the tweeter and a proper cross over.

    Exceptional condition given they are nearly 40 years old. EC studio driving them loud no problems. Surprising at 89db at 8ohms

    [​IMG]

    [​IMG]
    My very basic attempt at measuring. L+R. Those who have been following my room treatment will note the large sub 100hz null is all but gone.
     
  7. JustAnotherRando

    JustAnotherRando My other bike is a Ferrari

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    Only just noticed this, but is that aircon mounted at a wonky angle or is there some weird optical illusion thing going on? It doesn't seem to run parallel to the ceiling.
     
  8. Xecuter

    Xecuter Brush and floss your amp twice a day

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    Good eye, but the roof is slanted.

    [​IMG]
    Been wondering how I'm going to mount the projector, screen, ceiling panels and upgrade lighting with this slope.
     
  9. Josh358

    Josh358 Facebook Friend

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    [​IMG]
    My triamped Tympani IVa's, in split configuration (bass panels behind the mid/tweeter panels). I repaired them and plan on upgrading the midrange drivers, so their fabric is off . . .
     
    Last edited: May 7, 2019
  10. Azimuth

    Azimuth FKA rtaylor76, Friend

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    My setup.

    JBL LSR32's, powered by an Adcom GFA-5800. The Denon AVR is only used as a preamp (for now).

    Atlantic Technology 10" sealed subs, although the right one amp is not working. I think the amp went out.

    (And yes, that is a Laserdisc player up there. I'm a sucker for vintage technology. Also in there is my Pioneer DVD-Audio/SACD player.)

    [​IMG]

    I do love the JBL's, even if they are "studio monitors". Detailed, spacious, and not like scooped old-school JBL's. The big 12" woofers are also warm and punchy, but not boomy - very controlled.
     
  11. Josh358

    Josh358 Facebook Friend

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    My experience entirely. I tried absorption behind my IVa's and the imaging became very precise but dead, like what you hear in the studio. So localization was impressive, but the sound lost its mojo.

    Two channel stereo really needs help from room reflections.

    I've also tried QRD diffusers at the first reflection point on the front wall and they make the sound spacious, but in my installation, I found them a bit too phasey as I moved laterally. It may just have something to do with my setup or diffusers, because they seem to be the most popular room treatment for dipoles (some use skylines rather than QRD's). Where I did find the QRD's worked great was in the front corners -- I have some 703FRK bass traps there and when I put the QRD's in front of those, everything just clicks, spacious, deep wall-wall imaging with excellent layering but no sense of confusion. This with the mid/tweeter and upper bass panels about 5-1/2 feet from the wall, and arranged so that the reflected backwave can get around both sides of the mid/tweet panels.
     
  12. Josh358

    Josh358 Facebook Friend

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    [QUOTE="purr1n, post: 252127, member: 3"}

    *This "marketing" CSD below is what prompted me to eventually start Changstar. I puked when I saw it.
    View attachment 16560

    This is what I got:
    [​IMG][/QUOTE]
    LOL, that's hysterical. I have to admit, they did a brilliant job of hiding the nasties.
     
  13. zerodeefex

    zerodeefex SBAF's Imelda Marcos

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    Projector mounts allow you to adjust angle.

    Do a fixed screen to avoid waves over time.
     
  14. purr1n

    purr1n Desire for betterer is endless.

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    I too dislike diffusers at the first reflection point. My preference is an absorber. QRD lining the wall behind the speakers would be awesome.
     
  15. Poleepkwa

    Poleepkwa Friend

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    Mind explaining this a bit more?
     
  16. Hrodulf

    Hrodulf Prohibited from acting as an MOT until year 2050

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    1st reflections should be absorbed, rather than diffused, as they contribute to tonal balance, rather than imaging. Classic studio construction usually puts diffusion behind the listener.
     
  17. westermac

    westermac Friend

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    Cool to see some more L112's. Those white grill cloths are shaggadelic.

    The tweeter diaphragms are linen/phenolic and coated in aluminum. More pleasant and forgiving (i.e. rolled off) than the later ti tweeters but the aluminum coating tends to flake and peel off over time. Can still source replacements at a reasonable price though (JBL 035 tweeter uses the same diaphragm and goes for much less than the 044).
     
  18. Poleepkwa

    Poleepkwa Friend

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    Sorry for the OT.How or in what way does it affect the tonal balance? I have absorption myself, but have also read people recommending diffusers.
     
  19. Hrodulf

    Hrodulf Prohibited from acting as an MOT until year 2050

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    It has to do with how your auditory apparatus perceives sound. Up to 15ms every sound that flies to your earholes gets perceived as a single sonic event. This effect is pronounced up to roughly 25ms, when, depending on frequency you will start hearing smearing. Stuff that arrives in 30ms and later starts to contribute to the "room" sound and the feeling of envelopment.

    This is basically the mechanism how reflections alter the tonal balance and imaging.
     
  20. Josh358

    Josh358 Facebook Friend

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    Contemporary studio design for far-field monitoring does typically put diffusion behind, but in the context of a reflection-free zone. The goal of an RFZ is to suppress early reflections that are delayed by less than 20 ms. These are the reflections that interfere with image width and depth because they mask the first reflections on the recording, and that interfere with clarity because depending on amplitude the brain tends to interpret them as part of the direct signal rather than reverberation.

    Since studio RFZ's rely on angled reflecting surfaces you can't usually arrange them at home, so the best you can do is use methods to reduce the amplitude of undesired early reflections.

    Broadband absorption can reduce the amplitude of early reflections (above 100 Hz or so anyway), but that tends to lower reverberation time (RT60) so much that the room sounds very dry or dead. It doesn't really work for two channel stereo.

    So -- diffusion can also reduce the amplitude of early reflections, but by spreading the sound out so the reflection is diffuse rather than specular. That's like the difference between aiming a flashlight at a matte white wall rather than a mirror. If the amplitude of the first reflections is sufficiently low, it doesn't color the sound or impair the image.

    Essentially, you want to balance diffusion and absorption to a) minimize the amplitude of first reflections and b) maintain a suitable reverberation time (RT60) so the room is neither too wet (reverberant) or too dry.

    There are also some other considerations such as minimizing slap echo (just about anything against a parallel room surface will do this), and of course bass trapping, which is a whole different ball game though if you make absorbers thick (4-6" of fiberglass or rock wool) and mount them off the wall they will be effective down into the midbass. (Diffusers tend not to work at midbass frequencies -- for a QRD, they'd have to be very thick and large to do that.)

    REW and an inexpensive measurement mic will tell you when you've suppressed early reflections, and also will show you RT60 across the audio spectrum -- ideally, you want reverberation time to be the same at every frequency (curtains and carpets tend to reduce RT60 at high frequencies but not at lower ones making a room sound dead -- but you can get braoder absorption by mounting the curtains at a distance from the window).

    There are practical considerations though. For one thing, a number theoretic diffuser like a QRD (1D) or skyline (2D) can only be used effectively at a distance, typically > 8 feet or so. So diffusers that are closer than that typically won't work well and absorption has to be used instead.

    In my own room I've found that what works best is absorption behind my head (it's a small room so I have to sit close to the rear wall), absorption at the first reflection points at the sides (as Purr1n found, diffusion didn't work well there, though it's often used in large spaces, often in conjunction with absorption). Diffusion and absorption didn't work for me on the wall behind the speakers, although usually people prefer diffusion behind dipoles, but for some reason diffusion worked beautifully for me in the front wall corners.

    Of course not everyone has a dedicated room or a secret with which to blackmail their wife, so for most, canny use of home furnishings is probably the best bet. But I think it really depends on the room -- the acoustics companies make some nice wall panels, either in plain fabric that can match your paint or with the option of printing a photograph or painting on them. Or they could be behind a wall hanging or something. So it might be possible to sneak some treatment in if furnishings alone aren't doing the trick.

    I tried to go the furnishings route but my room was really troublesome and ultimately I had to use the absorption panels to get the kind of sound I wanted. The results were spectacular so I put up with it. But I'm personally not fond of overtreatment of the kind you see on acoustics company web pages. Not only will it destroy your marriage, but it will typically result in a room that sounds like a studio control room and that's incredibly clear but not very realistic for two channel. And bass trapping is difficult, particularly below 100 Hz or so. I think bass EQ is a better solution, with sub placement and minimal bass trapping to eliminate nulls that can't be EQ'd out.

    But to each his own. And what you need really depends on the room and furniture, too -- some are good without any treatment at all, others are horrible with problems like echo or slap echo (which however can be fixed with simple remedies like bookshelves) or bay windows, what have you.

    (For what it's worth, Wendell Diller at Magnepan is taking the 30.7's on a North American tour and he said that he'd had them in 49 different rooms and that he heard 49 different 30.7's. Some of the were so bad that they made the 30.7's sound worse than properly set up 3.7's. But he said that in general, the best rooms used diffusion. But that would apply to dipoles, not necessarily to other speaker types.)
     
    Last edited: May 21, 2019

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