Improve quality of HP out

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This topic contains 5 replies, has 3 voices, and was last updated by Profile photo of Mike Storm Mike Storm 3 months, 3 weeks ago.

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  • #62932
    Profile photo of ddff_lv
    ddff_lv
    Participant

    Today I noticed that IEM connected to ME-1 sounds “thin”, like when using wireless IEM system, comparing to HP output of Qu-SB, that sounds really “juicy”- much greater dynamics.
    I understand that operation from PoE puts some limitations on max voltage swing and also total power. But maybe there still is a way to bit improve the performance of HP amplifier?

    ddff

    #63031
    Profile photo of ahjeff
    ahjeff
    Moderator

    The headphone output on the ME-1 is pretty powerful, and is the same whether running on DC or PoE. Have you tried plugging normal headphones in, to see how that sounds? Is the output EQ on the ME-1 definitely flat?

    Cheers

    – Jeff, A&H

    #63075
    Profile photo of ddff_lv
    ddff_lv
    Participant

    Yes, I tried Shure SE215 and also Sennheiser HD280. Output EQ was flat, DO sources post EQ. I got a feeling it did not like the low impedance. What opamp is used for ME-1 HP out and what in Qu-SB?

    ddff

    #63087
    Profile photo of ahjeff
    ahjeff
    Moderator

    Looking at the ME-1 user guide, it recommends using headphones with 16-600 Ohm impedance. At 64 Ohms, the HD280s are well within this range. I tried a pair of this exact model with my ME-1, and anything over around half volume was far too loud to have them on my head.

    The ME-1 uses a stereo class-A amplifier implemented using discrete transistors. I was not involved with Qu-SB, but it appears to use two parallel NE5532 op-amps per channel.

    I’m not sure what else to suggest. Do you have a second ME-1 to try? Perhaps you could compare the ME-1 and Qu-SB using some pre-recorded music?

    Cheers

    – Jeff, A&H

    #63106
    Profile photo of ddff_lv
    ddff_lv
    Participant

    Strange, by the description ME-1 HP out should be better than Qu-SB HP out. I will retry my test and also different ME-1.

    ddff

    #63107
    Profile photo of Mike Storm
    Mike Storm
    Participant

    I for one really love the ME-1 output, not just the level (it can get really loud!) but the clarity too. Personally I think it sounds better than other A&H products I’ve used, and way better than other personal monitoring mixers, but that’s subjective experience, not really based on specs.

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