Bjorn
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Posts posted by Bjorn
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"Distortion" is a bit ambiguous. I suppose you're talking about harmonic distortion, which is easy to measure. If so, then...
Left Jub + subs 2 Dec 2014.pngI'm crossing the K-402 with TAD TD-4002 driver at 425 Hz,48 dB/octave L-R to the Jubilee bass bins, then at 40 Hz to the TH subs. Microphone 1 metre in front of the left Jubilee centered at the K-402/bass bin interface.
I don't see any evidence of what you're describing. In fact, it gets better. The in-room SPL is about 100 dB instead of the 120 dB shown.
Chris
Yes. I meant harmonic distortion.
You say the in-room level SPL is 100 dB. Is that the correct level at 1 meter and what you have measured with?
Could you measure with 105 or 110 dB and post it?
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A bit of a sidenote. Are there any compression drivers that have low distortion down to 500 Hz?
I haven't any seen any. Drivers like JBL 2445, 2446, 2447 and other brands have an increasing distortion below 800 Hz. And those who have experienced a lot with this (measured and listened) say the absolute lowest crossover should be 600 Hz but they claim it often sounds better when crossed over somewhat higher (700-800 Hz).
So despite that a horn like K-402 can be crossed over very low, and I'm not certain it's the better solution all together. Personally I haven't experience much with this though.
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There is a possibility that the holes in the synergy horn will cause some audible diffraction and a poor impulse response. Geddes pointed this out in a discussion. Tom Danley said he was going to present better measurements with higher resolution. That was at least a year ago and he never showed anything. That might indicate something.
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Got another confirmation about building a wood top horn. They look so nice. Thanks for sharing Arash.
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You will have some serious vertical lobing with that system, so ceiling/floor treatment is vital.
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Round horns like these doesn't give you constant directivity. They beam a lot. Not a good choice IMO.
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does anybody know a vendor or dealer of Klipsch in US that can ship a pair of K69/K402 for me to Turkey or UAE?
I used cinequip to order mine to Norway. I believe they were shipped directly from Klipsch. They were not packed very well, but made it here safely except a small insignificant scratch on the base.
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A bookshelf doesn't really diffuse. It scatters some, but mainly absorbs.
Diffusion in the early reflection zone doesn't give as good imaging as absorption or redirection (splayed walls) but broadens the image with more spaciousness. If the goal is accuracy and great imaging using either absorbent panels or angled hard panels is the best option for early reflections and use diffusion for later arrving reflections. This is basically LEDE/RFZ in a nutshell. It's important though that absorbents are thick enough to absorb everything above the schroeder frequency. Using thin panel like 2", carpents or similar only attenutes the very highs and easily makse the room sound dull and dead. Even 4" thick panels is a compromise. 6" or 8" is better.
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If good imaging is the only thing threadstarter is missing, it can easily be obtained with acoustic treatment. The earliers reflections are the most detrimental ones. Use a minumum of 4" thick absorption panels.
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K-402 in wood!
in Technical/Restorations
Posted
For those who live in Europe and are interested in a wood horn, I may be able to help later this year. However, it will not be cheap and this will be another horn design than K402. The goal is to produce something slightly better, which is possible IMO. If it doesn't become an improvement I don't see any point in offering it. The designer is well known but I will not reveal his name at this moment.
I'm also working on a midbass horn in wood and this should be ready within a few months. Here's a picture of a prototype.