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Multi-Way Conventional loudspeakers with crossovers

Ribbon based multi-way speaker
Ribbon based multi-way speaker
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Old 1st June 2019, 11:21 AM   #1
UltraFidelity is offline UltraFidelity  United States
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Default Ribbon based multi-way speaker

I am putting the final touches on a RAAL based MTM with passive crossover using all premium components. I also build a lot of my own amps and considering building a new amp with high end dsp for a ribbon based multi-way system. With the RAAL tweeters I need to use a 10-15uf Cap for protection rather then going right into the tweeter directly which will color the sound a bit. Has anyone run an active DSP crossover with RAAL ribbons and if so what were your thoughts compared to a nicely implemented passive crossover. A pretty well known DIY designer said he was not a fan of dsp crossovers with ribbons and recommends only passive designs for ribbons. I just sold my last build with integrated DSP so I would have to build a new amp to test it out but I have an electronic crossover that should get me close enough for testing purposes. I would like to get some people’s input before I decide to build another DSP based amp and how they feel if meshes with the RAAL ribbons.
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Old 1st June 2019, 12:16 PM   #2
Sebastian K is offline Sebastian K  Europe
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There are dangers to this approach.
DSP malfunctions, software glitches or mistakes by the user may easily fry the tweeter with DC or low frequency output.
Amp malfunctions and DC offset may as well.
To manufacturers, a protective Cap is a no-brainer.
You may want to add protection circuit instead if a cap is not wanted (not that I'm familiar with any circuits that can be used for this task).
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Old 1st June 2019, 12:38 PM   #3
Sebastian K is offline Sebastian K  Europe
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Forgot to mention that the ribbon tweeter impedance goes approaching zero at low frequency. Check your datasheet. Which RAAL is yours BTW?
Regards, Sebastian
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Old 1st June 2019, 05:03 PM   #4
Lojzek is offline Lojzek  Croatia
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Why does it matter which approach is being held in a higher regard in the eyes of a pretty well known DIY designer when it comes to crossover design? What matters is that one understands the basic principle of how and why the manipulation of the FR of the units in/out of the crossover region is essential. Whether one chooses dsp over passive or vice versa, is irrelevant in the sense of good sound quality, not so if you have preferences because of practical reasons.

Last edited by Lojzek; 1st June 2019 at 05:10 PM. Reason: grammar
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Old 9th June 2019, 01:52 AM   #5
UltraFidelity is offline UltraFidelity  United States
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I have never used DSP with a ribbon based system. 2 designer advised heavily against the use of DSP in a ribbon set up especially with the RAAL ribbons for a few reasons. They have never used a DSP in a RAAL ribbon set up so I am taking the advice with a grain of salt. I recently sold a high end amp/Dsp combo that I built for show last year so for me to try it on my own will cost me a few grand and I rather not spend the money to be disappointed. I am interested in seeing if anyone has run something like this before and what their results have been.
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Old 9th June 2019, 02:54 AM   #6
audiogod66 is offline audiogod66
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Selah audio used Raal with Deqx DSP units and although I have not heard a setup I do own a Deqx and the dual Nht XDA Deqx based system .Rick Craig may be the guy to ask.
Here is a link to a system he did
No Audiophile's Reference system review / Selah Mejor Supreme
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Old 9th June 2019, 08:24 AM   #7
Sebastian K is offline Sebastian K  Europe
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Quote:
Originally Posted by UltraFidelity View Post
2 designer advised heavily against the use of DSP in a ribbon set up especially with the RAAL ribbons for a few reasons.
Did you care to ask why? Aside from what I've already written, I'd like to hear other's opinions too since I played with the idea as well.
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Old 9th June 2019, 12:57 PM   #8
InOtIn is offline InOtIn
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I will be using this high-end DSP for my own RAAL build, hopefully with FIR filters created by Audiolense:

Hi-end DSP based multi-channel integrated Preamp/Crossover/DAC project
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Old 12th June 2019, 10:54 PM   #9
Rick Craig is offline Rick Craig  United States
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Quote:
Originally Posted by UltraFidelity View Post
I am putting the final touches on a RAAL based MTM with passive crossover using all premium components. I also build a lot of my own amps and considering building a new amp with high end dsp for a ribbon based multi-way system. With the RAAL tweeters I need to use a 10-15uf Cap for protection rather then going right into the tweeter directly which will color the sound a bit. Has anyone run an active DSP crossover with RAAL ribbons and if so what were your thoughts compared to a nicely implemented passive crossover. A pretty well known DIY designer said he was not a fan of dsp crossovers with ribbons and recommends only passive designs for ribbons. I just sold my last build with integrated DSP so I would have to build a new amp to test it out but I have an electronic crossover that should get me close enough for testing purposes. I would like to get some people’s input before I decide to build another DSP based amp and how they feel if meshes with the RAAL ribbons.
As long as you use a series cap a DSP unit will be fine with the RAAL.
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Old 13th June 2019, 05:30 AM   #10
Sebastian K is offline Sebastian K  Europe
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UltraFidelity,
I was under the impession that you would be trying to run this without a series cap. I wrote posts #3 and #4 accordingly. I agree with Rick. Anyhow, let us know what you find please.
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