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The new MiniDSP 2x4HD has made all my skills obsolete. How about yours?

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  • dcibel
    replied
    Originally posted by Kornbread View Post

    Can you do that with a usb input?
    Maybe. Plugging in two devices will likely result in two separate audio devices in your computer, so it may work if you can get your software to output to two audio devices at once. This should be fairly easy in Linux with pulseaudio, however I can't say the same for Windows, but a google search leads me to believe its possible

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  • Kornbread
    replied
    Originally posted by dcibel View Post
    No way? With analog you can easily use two, just send the right signal to one and the left signal to the other. With SPDIF you'd need a splitter, about $3 part from monoprice.

    Here's an image I pulled from a google search:
    [ATTACH=CONFIG]n1344437[/ATTACH]
    Can you do that with a usb input?

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  • dcibel
    replied
    Originally posted by dlr View Post
    Looks like no way to use two 2x4HD units together, if you need more than four outputs (say a 3-way stereo setup), you have to go 4x10, $100 more than two 2x4's.

    dlr
    No way? With analog you can easily use two, just send the right signal to one and the left signal to the other. With SPDIF you'd need a splitter, about $3 part from monoprice.

    Here's an image I pulled from a google search:
    Click image for larger version

Name:	miniDSP2x4H-8-way-crossower.jpg
Views:	17
Size:	40.1 KB
ID:	1344437

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  • dlr
    replied
    Looks like no way to use two 2x4HD units together, if you need more than four outputs (say a 3-way stereo setup), you have to go 4x10, $100 more than two 2x4's.

    dlr

    Leave a comment:


  • Juhazi
    replied
    Yep, 2Vrms in HD https://www.minidsp.com/products/min...minidsp-2x4-hd

    I have both 4x10HD and 2x4HD, both receive analog signal from preamplifier (in different sets). One must be careful not to overdrive input signal level and to not use too much digital boost in PEQ settings. The noise level is generous, I can't detect any extra noise or reduced dynamics by listening or in measurements.

    Please forget the 2x4 without HD, the HD versions are so much better!

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  • xmax
    replied
    The original Mini DSP had very low output and S/N was terrible, did they fix that?

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  • rickcraig
    replied
    Originally posted by augerpro View Post


    Did you use the analog inputs or the toslink?

    Toslink / SPDIF.

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  • augerpro
    replied
    Originally posted by rickcraig View Post

    I've found it to be very transparent (4x10HD) and comparable to the DEQX units I've used.

    Did you use the analog inputs or the toslink?

    Leave a comment:


  • scottvalentin
    replied
    How do they sound? Are they audibly different with the phase correction?

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  • tktran
    replied
    Here's another proof of concept.

    First image is the Usher X-718, with stock passive crossover, measured at 1m, gated, with phase response shown.

    After I corrected for the frequency response and phase response using rePhase, I uploaded it to the miniDSP, then remeasured the same speaker.

    Note that you can correct for the frequency response and phase response independantly.

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  • tktran
    replied
    Here's an example of a crossover I made for an Usher X-718 2 way speaker (Usher 8948A 7" midwoofer + Usher 9950 1" tweeter), with an LR4 @2K, compared to the stock crossover.
    This is an unsmoothed frequency, gated. Ignore frequencies below 300Hz.

    Leave a comment:


  • tktran
    replied
    The naming of the miniDSP units is somewhat confusing. It's related to the timing of the releases.

    So the 2x4 is a 2 channel input (RCA analog input), 4 channel output (RCA analog output). The USB connector is for software control only.

    The 4x10 HD is a 2 channel input, 8 channel output (analog RCA out) device. But it's called 4 x 10 because it also has 2 digital inputs and 2 digital output. (2in8out + 2in2out = "4x10" It uses the older ADAU1445 DSP so it CANNOT do FIR filters. IIR only.

    Independant measurements of the 4x10HD can be found here.
    https://www.neurochrome.com/minidsp-4x10-hd/


    The newest is the 2x4 HD- a 2 channel input, 4 channel output. Except the stereo input can be either RCA analog input, Toslink optical input, or USB input. So if the old naming convention was kept, it should be called a 4x4HD.

    This unit has a ADSP21489 SHARC DSP, and thus offers FIR filters as well as IIR filters. So amongst other things, it can be used with Acourate, and other convolution engines, and is upgradeable to Dirac Live.

    My own measurement of the 2x4 HD from my iMac late 2012 model line-output to miniDSP 2x4HD line input.
    Last edited by tktran; 09-08-2017, 09:18 AM.

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  • ani_101
    replied
    Of all the minidsp, the 4x10 was the better quality both in terms of features such as supporting FIR and noise, etc compared to the 2x4. Any opinions on the 2x4 HD? Feature wise I think it's got it all, how's the noise part?

    Leave a comment:


  • rickcraig
    replied
    Originally posted by ugly woofer View Post
    Not to change the subject, but has anyone set the minidsp as a flat pass through and listened with a better quality setup, not to offend anyone, but I'm thinking something a step up from a sure amp or home theater receiver. I plan to do this sometime this winter when I have more time, but I would like to know how much of a degradation others have found. To be clear, I'm speaking of listening to a completed speaker without altering its response.
    I've found it to be very transparent (4x10HD) and comparable to the DEQX units I've used.

    Leave a comment:


  • ugly woofer
    replied
    Not to change the subject, but has anyone set the minidsp as a flat pass through and listened with a better quality setup, not to offend anyone, but I'm thinking something a step up from a sure amp or home theater receiver. I plan to do this sometime this winter when I have more time, but I would like to know how much of a degradation others have found. To be clear, I'm speaking of listening to a completed speaker without altering its response.

    Leave a comment:

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