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Post by foggy1956 on Apr 23, 2020 11:09:04 GMT -5
Tekton double impacts are out. They don't do much below 40 Hz. from what I see on internet frequency response curves. Remaining options: Crites Cornscala & Klipsch Cornwall Dirac measured my Double Impacts down to 20hz
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Post by garbulky on Apr 23, 2020 11:13:20 GMT -5
Those cornwalls won’t go below 50 or 45 hz in your room.
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Post by Boomzilla on Apr 23, 2020 11:34:29 GMT -5
Hi foggy1956 - How many dB down from the baseline was that 20 Hz. measurement? Hi garbulky - Klipsch specs their Cornwall IVs as having response to 34 Hz. (-4dB) but that's an "in room" spec - NOT an anechoic one. And manufacturers are given to hyperbole on their specs anyway. So I honestly doubt that the Cornwalls will actually reach 34 Hz. @ -4dB, but I'd think that they WOULD actually go lower than 45 to 50. Ultimately, I may end up in DIY territory to get what I want...
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Post by brubacca on Apr 23, 2020 12:24:45 GMT -5
And although my AURALiC Lightning DS streamer software is adequate for playback, it lacks the stability and user friendliness of Roon. So, I'd like to move toward building a ROCK platform to control playback. Any suggestions as to the best platform to use? Boomzilla, Roon Rock is designed to be run on a Intel NUC. I built one around a Nuc8i5BEH, which I got on Amazon at a really good price slightly used. On Roon Rock webpage they recommend a couple configurations. Ironically they recommend a i3 or i7 (mine is an i5). I populated it with a 128GB M2.SSD OS Drive , 500GB SSD Data Drive and 8GB Ram. I love the fact that it is completely headless after the initial install. All updates are from any of my room remotes, either PC, Android Phone or tablet. Wish I could have afforded a larger SSD Data Drive. I found it easy to install and its been easy to maintain.
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klinemj
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Post by klinemj on Apr 23, 2020 12:43:53 GMT -5
And although my AURALiC Lightning DS streamer software is adequate for playback, it lacks the stability and user friendliness of Roon. So, I'd like to move toward building a ROCK platform to control playback. Any suggestions as to the best platform to use? The Roon site lists recommended equipment for ROCK. All I have read says their reco'd gear works well, and much other stuff does also...but some of that other stuff does not. Mark
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Post by foggy1956 on Apr 23, 2020 12:45:22 GMT -5
Hi foggy1956 - How many dB down from the baseline was that 20 Hz. measurement? Hi garbulky - Klipsch specs their Cornwall IVs as having response to 34 Hz. (-4dB) but that's an "in room" spec - NOT an anechoic one. And manufacturers are given to hyperbole on their specs anyway. So I honestly doubt that the Cornwalls will actually reach 34 Hz. @ -4dB, but I'd think that they WOULD actually go lower than 45 to 50. Ultimately, I may end up in DIY territory to get what I want... Don't remember, if time allows I'll run a REW this weekend. REW measured my Enzo down to 35hz relatively flat and the DI's dig much deeper
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Post by garbulky on Apr 23, 2020 14:06:03 GMT -5
Hi foggy1956 - How many dB down from the baseline was that 20 Hz. measurement? Hi garbulky - Klipsch specs their Cornwall IVs as having response to 34 Hz. (-4dB) but that's an "in room" spec - NOT an anechoic one. And manufacturers are given to hyperbole on their specs anyway. So I honestly doubt that the Cornwalls will actually reach 34 Hz. @ -4dB, but I'd think that they WOULD actually go lower than 45 to 50. Ultimately, I may end up in DIY territory to get what I want... Yep so 34-4db is 39hz. That is an "in room spec" which is basically best case. Your room is very hard to get good low bass, so I'd estimate 45-50 hz realistic. Remember that previous cornwall, heresy and lascala you had? It had powerful bass but it couldn't manage low bass in room.
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Post by Boomzilla on Apr 23, 2020 14:20:49 GMT -5
Agreed. I definitely wouldn't spend $6K without an in-home trial. I'm thinking that the easiest way to get what I want is a DIY project. Use the 400-Hz. midrange horn from the La Scala and a Crites tweeter. Then build a larger box than the Cornwall and a woofer (or two) that would go to 30 Hz. or below. In fact, if I'm going that route, might as well shoot for 20 Hz. Most bass drivers (with the proper specs, and with the right box) will do 20 to 400 Hz. without too much trouble. If needed, I could even make a 4-way system -
Onboard sub (15 or 18 inch) 20 to 150 Hz. Mid-Bass driver (8 to 10 inch) 150 to 400 Hz. Mid Horn 400 to 2K Hz. Tweeter Horn - 2K on up
Sort of a DIY Tekton-1812 / Klipschorn hybrid. Needs to be 8 ohms; needs to be 100 dB / 1w / 1m sensitive.
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Post by richter250 on Apr 23, 2020 14:32:18 GMT -5
And although my AURALiC Lightning DS streamer software is adequate for playback, it lacks the stability and user friendliness of Roon. So, I'd like to move toward building a ROCK platform to control playback. Any suggestions as to the best platform to use? Why not use your Auralic Aries as a Roon endpoint? That is what I do and it works great.
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Post by Boomzilla on Apr 23, 2020 14:34:47 GMT -5
Why not use your Auralic Aries as a Roon endpoint? That is what I do and it works great. Thanks, richter250 - That is my plan. But I need a Roon source in the system - not currently using one.
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Post by Boomzilla on Apr 23, 2020 14:43:17 GMT -5
Also after contemplating DIY systems, they just don't look attractive compared to the two Airmotiv S-15 subs that I have. So that takes a LOT of pressure off the main speakers. Plus, the self-powered subs can work with a variety of different-sensitivity speakers. A home-built would be limited to mains of exactly equal sensitivity (unless I go bi-amplification and electronic crossover, in which case, I'm back to the complexity I've tried to avoid).
So for the time being, subs it is. Main speakers? Bring on the variety!
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Post by audiobill on Apr 24, 2020 5:07:44 GMT -5
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Post by Boomzilla on Apr 27, 2020 12:50:38 GMT -5
Got to teach my first online class this morning. I’d call it a success, and the students received the information with thanks. Much different than a classroom presentation, but it did work.
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Post by tchaik on Apr 27, 2020 13:06:16 GMT -5
Got to teach my first online class this morning. I’d call it a success, and the students received the information with thanks. Much different than a classroom presentation, but it did work. we started our first online teaching March 25th. For a music theory prof, this was a little intimidating. But, it turns out that it is working out pretty well, still not as well as in person. here is the work space.
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Post by brubacca on Apr 28, 2020 10:47:24 GMT -5
This is our 7th week under a stay at home order. It's also the 3rd week of online learning new material for my 2 grade school children. Plus my wife works for the school as an aide and is participating in the online classrooms.
Has anyone noticed that it's almost Damn impossible to get an affordable name brand webcam?
We have 2 e-learning stations setup with old laptops, plus I work from my work Surface and have multiple video conferences a day. Thank god I got a really good access point to extend the network.
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Post by Boomzilla on Apr 29, 2020 6:20:07 GMT -5
So this morning I discovered (and ordered) the Dayton DSP-LF from Parts-Express.com. It is programmed from any iPhone or iPad (because they all use the same microphone, unlike the Samsung products). One can select crossover frequency, crossover slope, flatten frequency response, and adjust for in-room echoes. And best of all, it doesn't interfere with the main speakers! Since I run right & left stereo subs, I actually ordered two of them. I'll velcro the DSP boxes to the back of each sub & have fun, fun, fun till her daddy takes the T-bird away! The basic software is a free download, and the "do everything" version is $5.
The Emotiva Airmotiv S-15 subs that I've been using have some minor issues that prevent me from using them the way I want to. Those issues include a fairly peaked frequency response that rolls off (a lot) before my preferred crossover point of 100 Hz. They also sound muddy and slow unless you put the boxes up on stands and pull them out away from the walls. The other issue that bothers me is that I want to use an upstream crossover to roll off the main speakers where the subs roll in, but getting a crossover that is neutral is virtually impossible for anything less than $3,000 (the JL Audio CR-1). I could use DSP in the playback software (Roon or AURALiC LDS), but if you use their DSP, it IS audible (and not in a good way).
My goal is to build a balanced circuitry crossover box with passive capacitors that roll off the high-pass at various frequencies (switchable from the crossover front panel). The high-pass slope will be a mild 6dB / octave for the least impact on phase. The DSP-LF will roll off the subs at 18dB / octave so that the subs and mains will be in phase at the crossover point.
So since DSP will be active ONLY on the low-pass, and the software offers a good bit of flexibility, I'm hoping that some of the room acoustics can be overcome with the DSP, allowing me greater flexibility with subwoofer placement. I should be able to adjust subwoofer phase individually for the right and left subs, making each fully phase-coherent with its main speaker, regardless of the physical displacement between the sub and speaker. I should also be able to equalize each sub for flat frequency response within the physical limits of room geometry. I should be able to extend low and high frequency extension of the subs, flattening the current "home theater hump" in their frequency response. And by having phase coherence and flat frequency response, I should be able to improve pitch-definition and the apparent "speed" of the subs compared to their non-DSP performance.
How well will this all actually work in practice? Stay tuned...
Boomzilla
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klinemj
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Post by klinemj on Apr 29, 2020 12:36:34 GMT -5
Looking forward to seeing how this works out.
Mark
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Post by Boomzilla on May 1, 2020 15:27:00 GMT -5
The Dahlquist DQ-LP1 turns out to be probably more trouble than I want to chase. One of the left-channel low-pass IC chips is defunct. And there ARE no replacement chips available (at any price) that have not only identical low-power consumption but also the ability to run with and without gain (at least one of the chips is a buffer). Any IC I choose as a replacement draws more power than the internal power supply can provide. Therefore, if I want to replace all the chips, I need to use an external power supply & hook it up to the DQ-LP1 via an umbilical cord. The input/output jacks are also problematical. The original cheapies were soldered to the PC board. I can replace them with new jacks mounted on the back of the chassis, but to do that EVERYTHING inside the box must be removed to get to the cutouts. Further, the cutouts are larger than the flanged insulators for the replacement jacks. So for a firm connection, I'd need to either fabricate a new case back or else find some rubber grommets to shim the chassis holes down to the diameter I need. All this is more trouble than it's worth. That is why I decided to try out the Dayton DSP-LF digital box. As KeithL points out, it WILL introduce an extra AD-DA conversion into the signal, but ONLY on the low-pass leg, where I wouldn't expect to hear it anyway. And for the near future, I'm planning on putting pennies in my piggy bank for the next pair of speakers for chez Boom. Still too early to speculate on what those might be, but some contenders include: Thiel CS 5i Thiel CS 3.6 Revel Studio Salon Tekton Double Impact Klipsch Cornwall IV Crites Cornscala Golden Ear Triton (1 or Reference) Definitive Technology BP 9080X If any of these perform sufficiently well in my room, particularly in the deep bass, I'll do away with subwoofers & simplify the system.
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Post by garbulky on May 2, 2020 5:23:27 GMT -5
Those Revel's sound interesting. I believe Amir at ASR uses them.
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Post by Boomzilla on May 2, 2020 5:39:52 GMT -5
The last Revels I heard were F30s, but they did impress me at the time...
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