Hmmm, it appears I accidentally selected the 50 posts per page option 
Jacek has far more experience with many types of horns and waveguides than I do.
I remember this topic was discussed last year, including listening spot, reflections and possible treatment.
vc08's posts are the most enlightening in this regard, but I know at least one exception to the "you cannot use a fairly deep horn across more than 4 octaves" - consensus.
It was also posted before by wesayso.
The horn, a modified Tractrix I believe, is used from 270Hz and the driver is a customized BMS 4592Nd.
Jacek has far more experience with many types of horns and waveguides than I do.
I remember this topic was discussed last year, including listening spot, reflections and possible treatment.
vc08's posts are the most enlightening in this regard, but I know at least one exception to the "you cannot use a fairly deep horn across more than 4 octaves" - consensus.
It was also posted before by wesayso.
The horn, a modified Tractrix I believe, is used from 270Hz and the driver is a customized BMS 4592Nd.
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I think I came to the conclusion that once a horn reaches a certain size it becomes “too” resonate....it would seem that if I am to push the passband near or below the tuning of a horn, that it is best to do so with the smallest horn/largest driver capable? I got the idea that above 350hz or so the resonate tail starts to show?....I think I’ve heard the idea described as not wanting the throat to be so deep...some type of negative affect on proximity? I am reiterating ideas thought upon months ago so forgive me lol I just recall 350hz being quoted as the largest size before this effect reared it’s head..this idea is supported by a large number of other popular horns, 300-350hz seemed to be a sweet spot for large Hf horns..then figure in polar pros/cons....fairly deep...is subjective...maybe I’ve found the outer range.
In regards to your example above, 270hz is right there...I bet the horns aren’t tuned to 135hz...they look to be about 300hz to me...
In regards to your example above, 270hz is right there...I bet the horns aren’t tuned to 135hz...they look to be about 300hz to me...
I feel like I’ve attempted this through this thread and HornResp...I spent a lot of time simulating and posting results not just here but on Martin Kings group as well...I trust my process....at the very beginning I always wanted a sealed system....like before creating the thread...and here I am creating a sealed system with exception of a horn of course
so it’s not like I’m “off track”...there is a chance the sub portion that I’ve designed might be note worthy to the board, If my projected measurements come to fruition. I am going into unknown territory in a sense....that is...bass extension that depends on dsp vs one that starts off flat in anechoic measurement without filtering.... I mean if I’m applying room correction, electronic filtering is present regardless...but the idea that I can extend bass bandwidth via very powerful drivers + eq and achieve natural sounding results is just outside my experience so...we’ll see...Geddes says it’s a non issue and that is comforting.Learning about transmission line is probably essential to all serious designers...
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Being that I have received various Feedback, not all good...how were your goals like mine and what were your motivations?
Docali you have navigate the website, it won’t let link directly to product page.
Is this a good deal on damping material?
Black Mountain Sheep Wool Insulation - For 24" On-Center Framing - Eco-Building Products
I think its between wool and denim insulation....anyone know where the deals are??
Black Mountain Sheep Wool Insulation - For 24" On-Center Framing - Eco-Building Products
I think its between wool and denim insulation....anyone know where the deals are??
Installation can be an itchy process, but never had any issues with fiberglass particles if the batting is attached using adequate staples and string to prevent shedding.
your thread has over 6,000 posts, i didn't read the whole thing. i was responding to your first post where you ask about a 2-way, full range, low distortion setup involving a compression driver and a woofer. my system, as i described, is just that. if you're curious about measurements, i attached it. a couple remarks:
-this was measured at the listening position, stereo, room as-is (no treatment); 1/12 octave smoothing since that's what stereophile uses. can you tell where the xo is on the measurement?
-there is some DSP adjustment, but not as comprehensive as i'd like (only 5 biquads available)
-over 200-10khz it shows very solid results, within around +/- 4.5 dB
-below 200 the bass gets a little more uncontrolled, and i have applied a bass boost for preference at 100hz
-above 10khz we're getting steep drop off: i have adjusted this in PEQ to get the result shown, but it still doesn't look great on measurements. this is due to the low cost tube amp i am using which has a huge rolloff. i tested the drivers without the horn on a solid state amp and the results are exactly what you expect for the TD-4001, which is a rolloff around 17.7khz
-the TD-4001 results are a separate measurement with no horn, SS amp for more linear response. even unsmoothed the results are remarkable imo. i'm not sure what the slight rolloff at 1khz is, that may be typical for this driver.
at any rate, the sound is superb to me. the woofer doesn't sound weird at all integrating with the horn, but i'd love to have more people listen to these and hear their feedback. on the bass front, with a little PEQ, i certainly don't need more than what the 15" provides. on the highs front, even with the rolloff, there's definitely enough treble energy for me. i don't feel like i'm missing out. i have plans to get a more linear SS amp on the 4001s, improve the horns, room treatment/bigger room, etc. but as is, i still think it sounds great.
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