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Ukko Kari

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Posts posted by Ukko Kari

  2. Bulding the Room2 listening room

    in Bass Gear

    Posted

    I like your format. Even though the room will dominate in the actual measured response, outdoor GP is the best measure, since all devices are on an equal playing field.

    A 'FAQ' or frequently asked questions section on your website can answer a lot of the same repetitive questions that can tie up your time replying to inquiries. Well informed customers can then email you for additional information on your products. 

     

    • Like 1

  5. Bulding the Room2 listening room

    in Bass Gear

    Posted

    1 hour ago, SME said:

    Yeah, and I'd bet that the majority of listeners, whether audiophile or not, could not reliably discriminate horn vs. dome based systems after listening in a room blind-folded.

    I'd love to be able to do this kind of experiment to see the looks of surprise if nothing else.  :)

    In a low volume setting, I would agree.

    Once the levels get above where the typical domes run out of excursion, there may be some that can tell the difference.

  8. New SVS Ultra 16"

    in Bass Gear

    Posted

    On 11/5/2017 at 11:16 PM, Electrodynamic said:

    You can add mass without adding inductance. High moving mass is not always indicative of high inductance. See our HST-11 mkII and HST-12 mkII. High moving mass and very good Le:Re ratio behavior. 

    Absolutely. In the Maelstrom-X drivers, there was a big nut glued behind the dust cap.

    Of course, one could go to a metal cone, which would aid in heat transfer, but that step is $$. Paper cone and $3.00 nut is more cost effective to use.

  10. Faital 15PR400, BMS 4594 MTM

    in Speaker Design

    Posted

    Now box # 2 has 4 sides and most all of the bracing glued and screwed in place. More biscuits were used compared to the first one,  and alignment of the panels is a lot nicer. Starting on #3, but weather is going to hold me up for a few days.

    With parts cut in multiples and pre-drilled with the Kreg jig, assembly is a breeze. Also, it helps having 20 pistol grip clamps in addition to the corner clamps.

  13. Psychoacoustics and hearing

    in Speaker Design

    Posted

    5 hours ago, Kvalsvoll said:

    I read through this article from 1982, and find that it largely covers what we know today about hearing, all was known back then.

    There are some things left out, such as the fact we can hear well below 20hz, and perception also depends on tactile information from skin and body resonances.

    The article concludes - "Future" - that performance of sound reproduction systems matches our hearing performance quite well, though improvements can be done, and that the big remaining challenges are related to acoustics and localization.

    The technical limitations of 1982's equipment has now been overcome - we have can have full dynamic range, no audible distortion, no noise. Back then, there were very real audible differences between amplifiers, tape machines, vinyl playback. Those differences live on in our day in the high-end world, but they are no longer part of psychoacoustics, it is pure psychology.

    Recent advancements in audio reproduction has been seen particularly in the reproduction of lower frequencies - full range systems with response well below 20hz, and full dynamic range exceeding 120dB, with awareness to tactile sensory effects. A big, capable bass system really makes a difference.

    Awareness and knowledge about acoustics has improved how well a 3D-rendering of an event can be reproduced faithfully and realistic. But here, we still have to choose what we can have. It has yet not been achieved to be able to reproduce an event so that it sounds realistic with correct rendering of scene and room from the recording, when you move around in the listening room. With directive patterns and early reflections removed it all falls apart when you move away from the sweetspot, or if you choose wide radiation in a lively room the whole scene is diffuse and does not render each object precisely regardless of position.

    Agreed, humans can hear below 20 hz, but that also requires high sound pressure levels, and can be masked by higher frequency content reproduced at the same time.

    Agreed, this article was put forth prior to the birth of the compact disc, DVD, DVD-A, SACD, Blu-ray, etc, when only tape, vinyl and shellac were the playback mediums.

  21. My living room "make over" (aka the "surrounded by bass" project)

    in Bass Gear

    Posted

    7 hours ago, SME said:

    The "problems" are by far the worst between 80-200 Hz or so, which is above where the subs can control the sound and below the speakers' baffle steps.  I have a single ceiling panel for my center channel in my room, and plan to install addition panels for my left and right channels once they are installed in-line with the center in the same inverted position. My measurements of the left and right channels suggest that the worst interference occurs due to the the floor-ceiling and ceiling-floor secondary reflections, which have similar path lengths and therefore combine into a single double-strength reflection.  This will change once they are installed in-line with the center.  Reflections from the side walls interfere less than I expected, which is excellent being that one wall has a huge window on it that I don't want to permanently block.

    At this point, I'm actually thinking of using 4 of my TD10s in the boxes I plan to build as platforms for my left and right, thus turning those speakers into a kind of pseudo-line array.  Essentially, the horn would cross to the TD12M on top, and then the vertically oriented TD10s below the horn would be brought in somewhere around maybe 500 Hz or so (depending on what I find works best), and then the subs, which are on the floor, coming in somewhere south of 200 Hz.  At that point, the "speaker" would be acting roughly like a floor-to-ceiling line.  The potential benefits of this configuration would be possible reduction of output in the low mid-range and upper bass for seats nearer to the speakers and reduced floor and ceiling interactions overall.  The speakers as they are hold the horizontal pattern quite well down to almost 500 Hz, so ideally I could continue to shadow the near seats in the lower frequencies too.  I really like this concept "on paper" but I haven't done a detailed analysis yet.

     

    I like your idea, and it wouldn't be hard to implement in your case. I would be interested in hearing your subjective impressions of the pseudo line.

  22. Bulding the Room2 listening room

    in Bass Gear

    Posted

    Kvalsvoll, have you tried any of the Danley Sound Labs recordings? http://www.danleysoundlabs.com/tom-danleys-mic-recordings/

    A friend of mine who has spent many hours behind the handlebars of a shovelhead was downright shocked at the realism afforded by the recording of Donny's Harley. You could 'feel' the individual cylinder pulses from ~ 4 meters away. I tried uploading the zipped file, but it exceeds the attachment limit.

     

    • Thanks 1

  24. Faital 15PR400, BMS 4594 MTM

    in Speaker Design

    Posted

    A baffle of infinite size can be considered a 180 degree horn. The acoustic impedance will change rapidly from the mouth of the horn to the baffle. giving rise to diffraction, unless there is absorption, or a very large radius at the mouth where it transitions to a baffle, but this also depends on the frequencies of interest from the horn, the dispersion and the physical sizes of the device in question.

    In other words, diffraction and re-radiation is still a real problem for horns of finite dimensions.

     

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