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There are other delay filters in the Computer Music Toolkit that you can try. As for fractional phase alignment among aligned drivers, I donвЂ™t know how many decimal places the simple delay (from ladspa-sdk) will use. Re: positioning, inverse speed of sound is about 1ms/foot or 3ms/meter. Simply delete that plug and slave the вЂfilterвЂ™ plug directly to вЂspeakerвЂ™.

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For drivers that are correctly aligned relative to one another, one could eliminate the entire вЂdelayвЂ™ plugin. My woofer cabinets are separate from mid+tweets, so the delay filter gives me flexibility in locating the mid/tweeter cabinets relative to the woofers (which need slight delay). Once all is in order, adjust frequencies for your drivers. That protects them from user stupidity! The initial 500Hz XO point is good for hearing what is going on using the command speaker-test.

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For example, my speaker system is 3-way, but my mid driver output is flat way up, so I choose to use a passive single-pole filter on the nice tweeters.

Everybody will want to tweak, and the basis for a simple rig should be present in the nf given above. Regarding the overall design of any crossover, I think simpler is better. Regarding testing, I donвЂ™t have any DSD files to test at the moment, so IвЂ™d be interested to learn or hear what happens when DSD hits the filters! Also, for less-characterized filters than the RT series, we should probably run frequency sweeps to confirm rolloff behavior. :~# cat /proc/asound/Botic/pcm0p/sub0/hw_params

Kill MPD and check that all plugins are incorporated into ALSA - at top of list: default, filter, delay, and speaker Input # first parm = delay in seconds, second param = вЂwet/dryвЂ™Д¤&5. Path '/usr/lib/ladspa' # correct location of filters? There is certainly more work to be done, but best to put this out while the steps are fresh in memory. The next post details the steps I took for a two-way crossover that is sounding pretty good - even played through the little powered monitors i'm using for development (balanced, at least ). Sharing working configurations is a huge way to help each other. To this beginner, ALSA seems capricious and temperamental! Implementing plugins is a trial & error process, for sure. The solution was to execute LADSPA filters in ALSA using plugins in the user space under the control of alsa configuration file(s). In addition, the CPU demand of rate-resampling by MPD/Libasound caused data under-runs with files recorded at 96kHz - and that was for a simple two-way system. Bit-perfect output, a primary design goal of the BBB/Hermes/Cronus, is defeated. Ecasound is good software, but running in the background it forces any player (like MPD) to output at ecasound's single chosen frequency. I tried this approach with the BBB and was unable to achieve filtering that was always free of resampling.

Sidplay decoder serial#

This implementation employs the host ecasound to manage serial filter chains. With the inexpensive and clean computing power now available in SoC development boards like BBB, I think LADSPA filters will see renewed interest.ДЄ fairly recent linux filter implementation by Richard Taylor uses filters created for loudspeaker crossovers. LADSPA filters have been designed and optimized for different qualities. Previously I used Jan ThuneauвЂ™s IIR filters in a PC, and was always pleased with the fine-tuning that was possible. But the filters still do their jobs and a number of them are theoretically applicable to digital crossovers for bi/multi-amped reproduction systems. Many LADSPA filter plugins are somewhat archaic, having been developed a decade (or more) ago for audio production methods that are now largely obsolete. I have moved the ALSA code to GitHub for easier maintenance and distribution:

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To start with, this will be split into 3 separate posts: a) this intro, b) the steps I used to create a two-way crossover (note update for generic 2-way and for a 3-way system), and c) a bit of discussion and a few perspectives. Improve and expand methods and working knowledge. Optimize for and compare results based on very similar platforms running the Botic kernel.ДЈ. Share working solutions - ALSA is not always intuitive, and advanced features are poorly documented.Дў.

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Disclaimer - I am neither a hardware nor software guru - far from it! This is a thread for us 'trial-and-error' hobbyists and has three objectives:ДЎ. My only experience is with the Beaglebone black fitted with Twisted Pear's Hermes and Cronus capes. This thread concerns the implementation of LADSPA filters in linux on ARM-based player-platforms.