Results 1 to 7 of 7

Thread: DSP crossovers and Phono Stages?

  1. #1
    Junior Member cosmicjazz's Avatar
    Join Date
    Sep 2019
    Location
    brazil
    Posts
    4

    DSP crossovers and Phono Stages?

    DSP crossovers and Phono Stages, share your thoughts....

    It's a big compromise to the phono signal?

  2. #2
    Senior Member
    Join Date
    Apr 2003
    Location
    Covington, Ohio
    Posts
    688
    I'm going to say no on compromising the signal.

    Properly set up a DSP crossover can "fine tune" a speaker system in ways an analog crossover can never do such as driver time alignment, phase response, band pass output EQ, band pass output limiting.
    Ok there were some analog crossovers that did have output limiting and some with EQ in the form of plug in cards or modules.

    What DSP are you looking at using?

    There is no DSP that I'm aware of that can directly take a phono input.

  3. #3
    Administrator Mr. Widget's Avatar
    Join Date
    Apr 2003
    Location
    San Francisco
    Posts
    10,010
    Quote Originally Posted by cosmicjazz View Post
    DSP crossovers and Phono Stages, share your thoughts....

    It's a big compromise to the phono signal?
    Are you asking if digitizing an analog signal from a phono section is too big a compromise? I guess Iím not sure what you are asking or saying.


    Widget

  4. #4
    Senior Member Ian Mackenzie's Avatar
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,146
    Quote Originally Posted by cosmicjazz View Post
    DSP crossovers and Phono Stages, share your thoughts....

    It's a big compromise to the phono signal?
    If you can tell us more about your overall system it would help an appropriate response.

    There are phono stages and turntables that feature an AD conversion. Is it a compromise? That depends on why you might want to convert vinyl to digital and the budget you have.

    As a rule those who have invested in an expensive turntable, arm and cartridge are unlikely to consider an active crossover unless itís necessary (like a Jbl 4345 or 4355) and preferably not a dsp active crossover.

    The compromise is in the user implementation unless set up by the loudspeaker designer in the consumer hifi space. That also applies to analogue crossovers. There are some very good examples OEM dsp loudspeakers featuring the DEQX crossover and they have been specifically set up and integrated into the design by the loudspeaker engineer. They are generally hi end systems over $50,000. What l am referring to here is legitimately integrating an active crossover to a specific loudspeaker.

    In the diy home audio space itís s case of deciding what suits your needs and your budget.

    Dayton Audio have a cool low cost dsp crossover you may wish to try. There is a learning curve with any active crossover so be prepared to spend some time making adjustments.

    What you have to bear in mind is that popular music is generally mixed and mastered on several different kinds of loudspeaker monitors so engineer can gauge how the recording will sound at home. Yes this is true. If you start messing with the mastering EQ when you plug in a dsp active crossover (in other words attempting to make the loudspeaker perfect) then you will end up with a different rendition to that which the artist and engineer intended. So it might sound odd. That is why loudspeaker manufacturers like Dynaudio have scaled back on dsp processing in their active loudspeakers to just assisting with the loudspeaker room placement generally. At home you wonít know what the engineer intended so a safe place to be is to screw with the signal as little as possible.

    This may awaken some discussion but there is irrefutable logic here.

  5. #5
    Administrator Robh3606's Avatar
    Join Date
    Apr 2003
    Location
    Rocinante
    Posts
    7,996
    DSP crossovers and Phono Stages, share your thoughts....

    It's a big compromise to the phono signal?

    I am a little confused as well by your question as it gets a bit complicated. As Mike said no DSP will take a signal at the level even from a high output MM not getting into MC. For it to happen you would want to be at line level past the phono stage. The phono stage amplifies and does RIAA EQ. In better pre-amps they also allow you to vary the loading for the cartridge so you could optimize the response up top.

    Do you have an analog pre-amp with a phono stage or a stand alone phono stage?

    After that it's really no different than any other line level analog signal you would convert to digital and use DSP to process. Really a preference issue as I see it. To some Analog guys it would be sacrilege, me I would be open to try it.



    Rob
    "I could be arguing in my spare time"

  6. #6
    Senior Member Ian Mackenzie's Avatar
    Join Date
    Apr 2003
    Location
    Australia
    Posts
    7,146
    Perhaps the OP does not appreciate the Day the Earth stood still around here was the day after the last driver rolled of the line at Northridge.

  7. #7
    Dang. Amateur speakerdave's Avatar
    Join Date
    May 2003
    Location
    Northern California
    Posts
    3,578
    In my experience the answer to the general question about signal processing is to choose high quality components and minimize the path, especially in the treble frequency range. Therefore, even though I use analog crossover and equalization, I take a separate full range output from my preamp and feed that to an amplifier for the treble then through a passive highpass network to my horns. I would do the same if I were using digital processing. I get away with this because my horn/driver combo work well with a simple high pass network.

    If the question is, once having chosen an analog source for the salient qualities of analog, whether it makes sense to pass that signal through digital processing, for me, probably not. If playing and finding something special in LP's recorded before digital mastering (and not digitally remastered reissues), then, never. However, twenty or thirty thousand dollars, including professional setup, might buy another answer. I think straining at an analog gnat to play digitally mastered LP's is questionable, especially if you have the capacity to set up some high res digital.

    I should probably semanticise "in my experience." I'm not in the tweak wars. My requirements for a sound system are that it sound musical and not irritate me even after hours of listening. This has led me to simple two-way speakers using a fifteen to a horn and beryllium, electronics no worse than '90's high end, an old Thorens turntable, sanely priced moving magnet and moving coil cartridges, slightly above modest digital sources, including a Bryston DAC, and non-esoteric wires. Having once had the experience of hearing a speaker system which cost about five times more than I had ever dreamed of spending, and knowing I was going to have to match it or get another hobby, I assiduously remain ignorant of what $200,000 systems sound like.
    "Audio is filled with dangerous amateurs." --- Tim de Paravicini

Thread Information

Users Browsing this Thread

There are currently 4 users browsing this thread. (0 members and 4 guests)

Similar Threads

  1. 5 Stages of audio acquisition
    By SEAWOLF97 in forum General Audio Discussion
    Replies: 2
    Last Post: 04-28-2017, 12:00 PM
  2. phono preamp
    By pyonc in forum General Audio Discussion
    Replies: 3
    Last Post: 03-19-2015, 09:49 AM
  3. Phono Pre-amp?
    By tom1040 in forum Miscellaneous Gear
    Replies: 16
    Last Post: 03-05-2012, 04:42 PM
  4. Phono Soundstage or Preamp?
    By shaansloan in forum General Audio Discussion
    Replies: 7
    Last Post: 08-05-2010, 04:36 PM
  5. Phono preamp-modules
    By hjames in forum Miscellaneous Gear
    Replies: 63
    Last Post: 12-18-2007, 01:06 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •