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dkalsi

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Posts posted by dkalsi

    1985 Cornwalls WO Cain Grills

    in Garage Sale

    Posted

    I’ve gone through maybe 5 (maybe 6) pairs of Cornwalls since 2007 - my FAVORITE were the 1.5 version, even though they were in the worst physical condition of the bunch (still very good, but last compared to the rest) - it’s the one I still own today. Goodluck with your sale.


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    • Like 1

    Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

    in Technical/Restorations

    Posted

    14 hours ago, Rudy81 said:

     

    Unless I am doing something incorrectly, I don't see much in the way of phase changes.  This plot is the original setup with a shelf and  single EQ, vs. various timing changes....all with the two PEQ method and NO shelf. I don't see much in the way of phase change.

     

     

    Phase changes.jpg

     

     

    I'm also curious about the same question @Rudy81 you pose above. My understanding was that phase was dependent on the frequency response. Whether you use PEQ or crossover to achieve a target curve  - your phase response would be identical.    <---- This is what I always assumed. 

    Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

    in Technical/Restorations

    Posted

    Very interesting discussion. 

     

    Sorry to beat a dead horse - but I want to go back to @Rudy81 question about what does the AMT-1 see at say 50hz? 

     

    Some of my questions may seem elementary because I haven't even done much with active systems / PEQ. 

     

    My understanding PEQ was that one has the specify the target frequency, gain/trim adjustment, and Q. 

     

    If one was to "crossover" the AMT using solely PEQ  say at 600hz, - would one not need multiple PEQs?- say at 600hz, 500hz, 400hz, 300hz, 200hz, - all the way down? One can broaden the impact of the PEQ by lowering the Q, but then you run to risk of impacting frequency about the target crossover region. 

     

    What am I missing? 

    Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

    in Technical/Restorations

    Posted

    I know the Heils have limited vertical coverage, but why is that so much of a concern?

    Wouldn’t you have a to be really focusing on the music to tell if there are issues? And if so, why is someone doing critical listening from anyplace but the main-listening-position? Even if the whole family wants to watch a movie together, I would assume they would be doing so while sitting down, no?

    I love having music play in the background as I’m working on other tasks, but the limited off axis vertical response rarely bothers me.

    Even speakers like the Oris are directional and due to the nature of their horn flare, they have limited vertical and horizontal dispersion (relative to traditional non-waveguide/horn based speakers), but that never bothered me when I’m 60 degrees off axis while working in the kitchen.

    Maybe there is more to it than current understanding (e.g, room interaction - phychoacoustics).




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    • Like 1

    Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

    in Technical/Restorations

    Posted

    I 100% agree with Chris’s sentiments. DO NOT buy anything from ESS just yet. One of mine also had issues. I’ve been waiting since January 12th. I have talked to Ricky several times, and sent follow up emails as he requested - still no replacement. Every conversation has been: “it’s going out today”, “just got a new batch, will go out tomorrow”, etc. etc.


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    • Like 1
    • Thanks 1

    Any Interest in an Eminence Lab12 Horn Subwoofer (Inlow Sound)

    in Garage Sale

    Posted

    Thanks, All. 

     

    Wanted to mention that my brother may consider a partial trade for an older 5.1 HT Receiver. The condition being that the receiver must have HDMI inputs and it must be reliable (i.e., have decent user rating on amazon or other website). He just needs something simple for bedroom. 

     

    If anyone has an older Anthem MRX - 300/310 etc. - that would be awesome. 

     

    Thanks,
    D

    Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

    in Technical/Restorations

    Posted

    On 2/13/2020 at 6:16 PM, Rudy81 said:

    Granted, this is all in my room....YMMV.  The hf quality did not seem to diminish at all when pointed outside my LP.  For now, the original setup is preferred.

     

    This does not surprise me. The off-axis horizontal response of the AMTs was quite good. I took 0, 20, 40, 60 measurements and the AMT was performed perfectly well up to 20Khz+, 17Khz, 15Khz, and 13Khz, respectively. That.....to me....is solid. Based on that, I don't think its worth while to toe them in. 

    Any Interest in an Eminence Lab12 Horn Subwoofer (Inlow Sound)

    in Garage Sale

    Posted

    (Location: Just north of Washington DC - 20852) 

     

    My brother is looking a to sell his Folded Horn Subwoofer. 

     

    He had it professionally built by a local woodshop entirely of 18mm baltic birch plywood. - He spent quite a bit of money considering its a challenging build. 

     

    I believe it houses dual 12" Eminence Lab12 subwoofers. It is an absolute monster from 35hz - 200Hz. With room gain, it digs a little lower. 

     

    My brother had this built knowing that it was not the last word in low-end extension, but because it was the most musical bass he had heard.  

     

    He used it with a pair of Heresys for music and occasionally HT. 

     

    Nor he or I know a fair asking price for this, but he paid well over $1,000 for this few years back. For now, he is asking $400 (which is about $50 less than what it costs to just purchase a pair of Lab12 drivers). 

     

    See picture below from Inlow Sound: https://inlowsound.weebly.com/folded-bass-horn.html

    8720983.jpg

    • Like 2

    Double Stack ESS AMT-1 with Wings--Possible Kit for Heritage

    in Technical/Restorations

    Posted

    2 hours ago, Chris A said:

    The same is true of Heresies: their 12 inch woofers would indicate that it actually will begin to match polars with the midrange horn only at 1100 Hz (although the Heresy is crossed at 700 Hz [Heresy II] or 850 Hz [Heresy III].  

    Chris

     

    I plan on experimenting with the Eminence Delta Pro 12A + AMT1s in the coming days. I'm nearly done completing a test cabinet and hope to start taking measurements by the weekend. 

     

    I know the ESS used the AMTs down to 800hz, but given my distortion measurements, I don't plan on using them less than 1200hz. I'll see how the horizontal polar response if the Eminence mattes the polar response of the AMTs at that 1200hz x-over point. 

     

    The Delta PRO should not start beaming until about 1300Hz (where the wavelength = 264mm). The Delta PRO's effective piston diameter is 260mm. So I suspect that above 1300hz, the wavelength will drop below 260mm and the cone geometry will start beaming. 

     

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