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Thread: Hypex DLCP (DSP) with 6 Channel UcD Amp Project.

  1. #21
    Join Date: Mar 2008

    Location: Dunfermline, Scotland, UK

    Posts: 12,247
    I'm inthescottishmafia.

    Default

    Good news.
    There are times when you canít do the sensible thing, when you canít act like a responsible adult at all; you just have to do whatever insane thing comes into your head. When bad people do it they end up murderers, when good people do it they end up heroes, and when the rest of us do it we end up looking like total idiots. But whenís that ever stopped us?

  2. #22
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,358
    I'm Ken.

    Default Update

    I've now had a good listen to the DLCP and put my analogue active crossover back in the system, I think that says it all!

    The DLCP just doesn't cut it, not bad on digital sources, but my analogue crossover is better.
    With my analogue (vinyl) source it is way behind.

    Just too soft and rounded off for my taste, with a reduction in bass weight.

    I didn't even get to try room correction etc. In a like for like set of basic crossover filters, without any EQ the basic tonality from both set ups was similar, but the digital just sounds flat and lifeless in comparison. Some folks might see it as an acceptable sound, especially if not using vinyl. I feel I have definitely stepped backward and I'm looking to move forward. I tried moving the crossover points and changing the slopes, but they were pretty much optimum where they were. The DLCP just has a signature sound that will not change with minor tweaking and is fundamental to the product.

    Music used:
    Vinyl
    Grace Jones-Night Clubbing
    Yello-The Race-45rpm
    "Tracey Chapman"
    Joni Michell-Hissing of Summer Lawns
    London Grammar-If You Wait-45rpm
    Jo Jackson-Night & Day
    Dire Straights-Love Over Gold

    CD
    Malia-Convergence
    Kenny Burrell-Midnight Blue
    Web Sisters-Savages
    Otis Taylor-Collection
    Laura Mvula-Sing to the Moon
    OMD-English Electric
    Calexico-The Black Light
    Gregory Porter-Take me to the Alley
    Sea Sick Steve-Walkin Man

    Streamed (Deezer)
    Alison Moyet-Other
    "America"
    B B King-Lets do the Boogie
    Kraftwerk-Minimum Maximum (Live)
    Yello-One Second

    I will mount the DLCP in a case, it will now be relegated to a development tool. When I get the measuring sorted, I will use it to finalise my analogue active set up. I need to reduce the rising response of the ribbon tweeter, a 5dB hump between 7kHz and 24kHz, the DLCP proved very effective at quickly trying this and it was a noticeable improvement. I used the plot from the driver spec sheet for the parameters, measuring real world combined driver response, should give even better results. I've been using the passive filter for the tweeter and it dealt with the hump, but I want to be fully active in the final version, even with the DLCP the ribbon tweeter sounded nicer active (flattened).

    So I tried it and it didn't work as well as I had hoped, moving on to plan B.

    I've now heard the DLCP and several mini-DSP offerings and not liked any of them. Gordon (Halfway tree) uses software based active filters through good quality stand alone ADC and DAC's. His results are a major step up over these one box solutions and I see this as the future for high end DSP.
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

  3. #23
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,358
    I'm Ken.

    Default Update

    I've been very disappointed by the sound quality of the DLCP, light in the bass, soft and woolly mid range, not good at all. Double checked everything, nothing wrong with the way things were connected or with the filters I created, which are exactly the same as the analogue ones.
    I re-read some of the threads on the diyaudio forum and folks were very pleased with the sound, so something wasn't right. I thought about the power supply, I was using the Aux output from one of Hypex's amplifier SMPS, which is an option suggested by Hypex. I thought about buying their dedicated SMPS for the DLCP which outputs the main dual rail voltage but also produces the single 8v standby voltage. I was very surprised when I read the spec sheet for this supply:

    "This switch mode power supply is specially designed to be used in mixed signal applications such as DSP and audio applications requiring a single low voltage output for powering the digital parts of the circuit and both a positive and negative output rail for powering the analogue circuitry."

    So the single 8v output may not be just for the standby function, I had used a cheap switching supply about 25x35mm for this, you can see it front left in the previous picture (post #17), as I presumed from the blurb, that it was not in the audio path. I decided to buy the dedicated supply.



    Didn't take long to swap out the Amp SMPS for the dedicated supply.
    What a difference, instantly more drive, solidity in the bass and crisper more transparent mid range, this is more like it.
    Still slightly better with digital rather than analogue sources, but not a lot in it, much much better.
    Hypex are known for minimal instructions, you don't actually get any and have to use the sparse information from the on-line spec sheets, which are great at detailing pin outs etc, but say little about what options you have, if straying from using an all hypex solution, (PSU etc) if you do your pretty much on your own. But to be fair, I have found them good at answering emailed questions relating to my build.

    So, I'm a much happier bunny, after a few hours of running, this is sounding very good indeed.
    I need to give this careful consideration now, as to whether the performance is better than my analogue active set up, enough to persuade me to enter stage two of the project and purchase six amp modules. These would form a Digital Pre/DSP/Power Amp's in one case, as detailed earlier.

    I think I need some extra ears now to give a second opinion on this.
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

  4. #24
    Join Date: Jan 2013

    Location: Durham - UK

    Posts: 1,358
    I'm Ken.

    Default Update

    Still tinkering with this as well as other projects.

    I'm at a bit of a crossroad situation...... I need to optimize the sound of the Hypex DLCP before making my final choice of using a Digital or Analogue active crossover.

    I'm taking my time over this as there is a lot to take in and learn. If your drivers are reasonably well matched, its easy to get a fairly good sound out of some basic filters quickly thrown together. To get the best out of your driver combination, is another matter and I've gone about as far as I can without measuring what is happening.

    To this end, I have just purchased a Focusrite 2i2 USB interface and I'm waiting on a Dayton EMM-6 mic from the States. The mic has been purchased from and calibrated by Cross-Spectrum Labs, to be accurate from 5Hz to 25kHz. All this technical malarkey is a big sideways step from enjoying my music, but it's my hobby and a necessary evil if I want to build something that will compete with commercial offerings well beyond my price point.

    One of the best features of the Hypex system, is that their DSP software is also the analysis software and it all works together in a single interface.

    The easiest way of explaining this principle is with a screen shot from their very minimal manual.



    The Red trace is the measured and imported response, you can work on an individual channel (driver) or the summed response for all channels (drivers).
    To add a filter, you click on the approximate position you want it (Green Dot), then in the main menu select the type of filter and adjust the frequency and +/- dB figures etc in the dialog boxes, to the exact ones required. This creates a filter and it's displayed as the Cyan trace. The Orange trace is the programs prediction of how this filter will effect the imported response. Users have reported a very similar measured response, to that which was predicted. You can add multiple filters/adjust/delete as required, it's quite a nice interface and fairly easy to pick up, through trial and error.

    It may not have all the bells and whistles of something as powerful as REW, no waterfall display for instance, but you do get Magnitude, Impulse and Step screens to work with. It's aimed at the DIY market, not at Audio Engineers and its feature set and interface have been designed with that in mind.

    It's a very useful tool, but Hypex make the point that they expect you to have a basic understanding of some of the audio science behind it all. I would add that, just as owning a CAD system will not automatically turn you into a mechanical engineer, using this type of software does not make you an audio engineer, with the knowledge of how to interpret and respond to the displayed results. That said, with a bit of reading, from their manual and around the forums, you can gain enough knowledge to produce very satisfying results.

    I need to put some of this to use now.
    Ken

    http://www.jkwynn.co.uk/
    DIY Technics/ProJect based Turntable + Terminator linear tracker + Ortofon MC20 Supreme / Pro-Ject Phono box & Pre Box RS / KMTech Active X-Over / Nakamichi AVP1 Power / DIY Sealed Three Way Speakers / Stello CDT100 Transport / DAC Magic.

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