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    The Computer Audiophile

    Accurate Sound Launches Multichannel Hang Loose Convolver



    Digital Room Correction (DRC) calibration expert Mitch Barnett's company Accurate Sound has officially launched the multichannel version of Hang Loose Convolver. This is a big deal. It's the only convolver on the planet with some of the features listed below, in the official wording I received from Accurate Sound. I've use filters designed by Mitch for three years, and I've used this multichannel version of Hang Loose Convolver for a couple months during the beta period. I have nothing but respect for Mitch, his work, and his first class support. 


    I'm guessing there will be a few people reading this who have no idea what convolution is, why they would need an application such as Hang Loose Convolver, or why I'm so enamored with all of this. I completely understand. I was in that boat, not too long ago. For those readers who want to learn a bit more about @mitchco and his work, have a listen to the Audiophile Style Podcast episode in which I interviewed Mitch.






    Here is the text, straight from Accurate Sound, about the latest version of Hang Loose Convolver Multichannel:




    Hang Loose Convolver multichannel version is now available for download at https://accuratesound.ca (Windows and Mac), which includes an updated Operations Guide.


    New features include: 


    HLC implements the industry standard convolver "config" file specification:http://convolver.sourceforge.net/config.html  

    • input and output delays with 0.1ms resolution.
    • input and output channel weights
    • summing input channels to a single output path - typically used for crosstalk cancellation filters.
    • both absolute and relative file paths to the filters are supported.
    • If the host sample rate changes, HLC will look for a matching .cfg filter to load automatically.


    Updated features:

    • AutoGain algorithm has been improved to provide better level matching between filters.
    • Instant filter switching has been improved to provide glitch free operation regardless if the filters are minimum phase, mixed phase or linear phase, including filters with excess phase correction.
    • Editing of dB gain values directly for the filter gain slider and master trim control.



    Hang Loose Convolver - A Listening Demonstration demonstrates how to configure Hang Loose Convolver for 2, 4, 6, and 7.1.4 channel sound. The listening demonstration provides audible examples of instantly switching level-matched FIR filters regardless if they are minimum phase, mixed phase or linear phase filters.


    The listening demonstration is designed to start off easy switching between filters that clearly have audible tonal differences and progressively getting harder to hear differences when comparing filters where only timing differences are made.


    The intent is to be educational in training one's ears to hear filter differences, whether frequency and/or timing response related.






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    23 hours ago, Archimago said:

    even through YouTube!


    Frank will feel validated.  😉

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    Is there any hope of having a remote volume control with dither and loudness compensation according to ISO226?

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    @Miitchco:  You may have seen a recent post of mine on the AL forum about sample rate conversion in relation to convolution.   Bernt confirmed that the ideal situation is for the digital source signal to remain unmolested all the way through to the DAC and that the convolver converts (if necessary) the filters to the same sample rate / bit depth as the source signal, thereby facilitating the convolution.


    Is that the way HLC does it?

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    That’s great, thanks.   It seems to me that this is quite a big deal and one more reason why your recommended software based DSP solutions are in a different league to MiniDSP and other hardware based offerings.

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