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Thread: Justin & Jerry's Hifi Blog

  1. #31
    Join Date: Jan 2008

    Location: Norfolk, UK

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    I'm BigBobJoylove.

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    I found that there's a vast potential difference in presentation when the vertical angle is adjusted, maybe moreso with the hybrid MLs, but the same should essentially work with the single panels. The more upright the brighter the sound. Or I should say the more directly fired at the listening position, the brighter the sound.

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  2. #32
    Join Date: Aug 2008

    Location: Suffolk, UK

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    I'm Paul.

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    I have found the same also, also my friend who has the Acent's says the same thing.

    Panels tend to beam more so that other drivers which means they tend to have much more treble energy on axis. ML tend to tilt there panels back a bit but I set the adjustable feet spikes so that they are more vertical. This is one of theweaker points of ML's they tend to have a sweet spot the curved panels help a bit but not much. Not sure if the CLS have curved pannels though. The best way to hear them is from far away but most UK living rooms are not as big as the average in the US.
    ~Paul~

  3. #33
    Join Date: Jan 2008

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    The CLS definitely have curved panels, CLS is an acronym form Curvilinear Line Source. What you've said about the living room size is bang on, but there's another giveaway factor on ML speakers that show they're designed for the US market; as houses in the UK tend to have solid internal walls the bass from MLs is almost always lean, houses in the US tend to have drywall internally which resonates at the lower frequencies causing bloom. A lot of US designed loudspeakers have an adjustment of some type on the crossover to counteract this effect, from my experience with american speakers (i.e. my last two pairs), if this is undertaken correctly it aids an even frequency response without compromising bass response in either situation.

    Ben Duncan mains conditioner
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  4. #34
    Join Date: Mar 2008

    Location: Galashiels

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    I'm inthescottishmafia.

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    Lovely panels Jerry.I wouldn't want to live without mine now.No more box speakers for me!

  5. #35
    Join Date: Aug 2008

    Location: Suffolk, UK

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    I'm Paul.

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    I know what you mean about US houses. I know it probably varies from state to state but I saw some vert nice, large houses in Houston. However seeing one being made is an eye opener. It was completely softwood framed with the exterior walls made from some kind of cladding. I just hope they have substancial amounts of fire retardant.

    The Summits have adjustable bass, obviously for this reason you indicated. Some of the older ML's have 2 bass drivers. One of them acts out of phase for the very low frequencies to stop overblown room gain, interesting idea.
    ~Paul~

  6. #36
    Join Date: Jan 2008

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    Thanks for the advice folks.

    I've just ordered 6x15 inch square egg-box type absorbent tiles. The initial plan is to fit them in the rear of the speaker as a vertical array of 15x45 inches each speaker.

    See how that goes - then play around a bit!

    It's kind of strange - the perceived balance is a bit on the bright side, but measuring the in-room sound with my Behringer DEQ2496, it actually slopes down from bass to treble ... ? Hmm.
    .

  7. #37
    Join Date: Aug 2008

    Location: Suffolk, UK

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    I'm Paul.

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    Hi Jerry, I hope it goes well with the tiles.

    As you have a dipole that beams a lot more than cones speakers you need to take nearfield and farfield on axis and average the result. If you mic is not on axis with the panels you will get a drop in treble. This is very obvious if you change the volume while off axis from the speakers and then go and sit infront of them they will be a hell of a lot louder and the treble alot stronger.

    This is one of the bad points about panels, they're very directional. However they do so many other things well.........
    ~Paul~

  8. #38
    Join Date: Jan 2008

    Location: Wrexham, North Wales, UK

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    Quote Originally Posted by jandl100 View Post

    Excellent, Jerry. A true 'den of iniquity'

    Keep up the good work!

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  9. #39
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    Quote Originally Posted by Primalsea View Post
    This is one of the bad points about panels, they're very directional. However they do so many other things well.........
    Heh!! Damn right there.

    More progress with the CLS - the key to tonal happiness is toe-in. ... oh and just the right setting on the subwoofer.

    Have just been listening to one of my fave Brahms choral CD with the CLSs quite severely toed in - the panels pointing a bit in front of me - luxuriating in the tonal warmth ... I would never have thought I'd be saying that about CLSs until now! Lovely jubbly.
    .

  10. #40
    Join Date: Aug 2008

    Location: Suffolk, UK

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    I'm Paul.

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    Jerry,

    FYI here's what I done with my foam tiles
    ~Paul~

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