Crossover for Linkwitz LX521

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Tubenstein

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billshurv

billshurv

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That I cannot comment on as I don't have LX521. Properly implemented both should be transparent but DSP allows a lot more flexibility. I will note that, in his last year Linkwitz changed his mind and decided ASP was better after some tweaks and changes. My view is it's as much a belief thing as a technical difference :)
 
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Tubenstein

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billshurv

billshurv

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Tubenstein said:
If you are in our positions, what would you choose?? ASP or DSP??
Click to expand...


I cannot answer that for you. 5 years ago I bought a set of ASP boards (not for LX, but because they are useful for all crossovers) as was very much in the pro analog camp. Then I looked at the capabilities of minidsp and the ability to just fire up a change in seconds and so bought one. both methods work so pick the one that suits your budget and preferences.
 
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Tubenstein

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billshurv said:
I cannot answer that for you. 5 years ago I bought a set of ASP boards (not for LX, but because they are useful for all crossovers) as was very much in the pro analog camp. Then I looked at the capabilities of minidsp and the ability to just fire up a change in seconds and so bought one. both methods work so pick the one that suits your budget and preferences.
Click to expand...

Me, would most likely to use 4 identical amplifier to power sup the LX521, however, my friend planned to use different amplifiers except the two for the midrange (Above 1K and below 1K). As a result, the miniDSP 4x10HD should be a better option as it is able to adjust the gain for each way / drive units, am I correct??
 
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Ugg10

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Joined 2017
As a 4 way speaker (LX521 Description) and if you have digital sources then, as described above you could -

Stereo digital signal (Toslink, Coax SPDIF or via a streamer) > Minidsp Nanodigi > 8 channel digital COAX output > 4 x stereo COAX DAC > 4 x Stereo amps > speakers

I have looked into this and am considering the following options -

Input via a Chromecast Audio (note, Nanodigi does not accept USB computer audio streaming)
8 channels of DAC - either Lucid 88192 second hand or 4 x Khadas Tone Board (usb powered)

http://www.symetrix.co/repository/88192_ug.pdf
Review and Measurements of WesionTEK Khadas Tone Board DAC | Audio Science Review (ASR) Forum page 2 for COAX input measurements (even better than USB!)

I have then got two Rotel RMB1066 amps which can be configured as 60w x 6 (4-8ohm) or 150w x 3 (8ohm) through bridging or any combinations in between. But you choice of amp is up to you, if on a budget a RMB1048 give you 8 channel at 50W in one box. Or any combination of stereo amps you are to use.


I am also considering whether to add in a passive variable attenuator in between the DAC and the Power amps (ladder type attenautor) rather than use the digital volume on the source (PC/APP) or nanodigi.


The beauty of this is that it keeps the signal digital until the last minute and you can choose your DAC and power amp combinations.

https://www.minidsp.com/images/documents/Product%20Brief-nanoDIGI%202x8%20Box.pdf
 
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T

Tubenstein

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Joined 2011
Ugg10 said:
As a 4 way speaker (LX521 Description) and if you have digital sources then, as described above you could -

Stereo digital signal (Toslink, Coax SPDIF or via a streamer) > Minidsp Nanodigi > 8 channel digital COAX output > 4 x stereo COAX DAC > 4 x Stereo amps > speakers

I have looked into this and am considering the following options -

Input via a Chromecast Audio (note, Nanodigi does not accept USB computer audio streaming)
8 channels of DAC - either Lucid 88192 second hand or 4 x Khadas Tone Board (usb powered)

http://www.symetrix.co/repository/88192_ug.pdf
Review and Measurements of WesionTEK Khadas Tone Board DAC | Audio Science Review (ASR) Forum page 2 for COAX input measurements (even better than USB!)

I have then got two Rotel RMB1066 amps which can be configured as 60w x 6 (4-8ohm) or 150w x 3 (8ohm) through bridging or any combinations in between. But you choice of amp is up to you, if on a budget a RMB1048 give you 8 channel at 50W in one box. Or any combination of stereo amps you are to use.


I am also considering whether to add in a passive variable attenuator in between the DAC and the Power amps (ladder type attenautor) rather than use the digital volume on the source (PC/APP) or nanodigi.


The beauty of this is that it keeps the signal digital until the last minute and you can choose your DAC and power amp combinations.

https://www.minidsp.com/images/documents/Product%20Brief-nanoDIGI%202x8%20Box.pdf
Click to expand...

Well...how can you set the crossover point slope??
 
U

Ugg10

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Joined 2017
All done in the Minidsp Nanodigi - this allows you to choose cross over points, slopes, add notch/boost/shelf filters and apply delays for each input and output channel.

from the manual -
"Filter types:
oLinkwitz Riley (LR): Available in 12, 24, 48dB/oct
oButterworth (BW): Available in 6, 12, 18, 24, 30, 36, 42, 48dB/oct [/FONT oBessel: Available in 12dB/oct
EQ band selection:
Select one of the 6 x Parametric Equalizers
•Filter type: Select between Peak, Low Shelf, High Shelf "

My aim would be to get acoustically flat using the output filters and then use the input filters to do room correction and to tailor to suit my taste (e.g. 6db 20-20khz slope, BBC 1-3khz dip, bass boost etc.). These can then be chosen (upto 4) using the remote on the fly.

Worth a read of the nanodigi manual - link on here - miniDSP in a BOX : nanoDIGI 2x8 B
 
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jeffbook

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Joined 2003
So if you spend the $8K for two Lake LM44, you still have to translate the crossover and EQ functions from the miniDSP 4x10 to however the Lake sets these up.

This has been shown on the OPLUG to be cumbersome at best. You would have to match the EQ curves output from the miniDSP. This is best down by measuring the output from the miniDSP and match them by adjusting settings in the new unit. Then confirm that they match the miniDSP on a trial and error basis by repetitive measurements.

Or, you could buy the miniDSP for $545 and either save $7,400+ or spend much more on other equipment. (amps???)

The ASP route may or may not be superior in performance and you lose the ability to adjust settings to dial in the speakers in your room.
 
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john k...

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Joined 2004
If you have the configuration file for the 4 x10 HD and the 4x 10 plug-in you can open the config file with the 4x10 plug-in and copy the setting to the plug-in for one of miniDSP's fully digital units as long as the sampling rate is the same. I assume there are some filters that are defined as biquads for the LX521.
 
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Davey

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Joined 2001
I answered your friends query on the OPLUG forum. Apparently he wasn't buying it. :) He was asking about a super expensive Accuphase DF-65 crossover unit that has no equalization capabilities. The LX521 requires extensive equalization capabilities on drivers, individually. I told him the Accuphase crossover would not work. How difficult a concept is this to grasp??????

My goodness.
Dave.
 
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