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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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Yeah, I guessed that by adding fixed resistance, the level will be reduced so won't really get much more out of them. I'm glad I asked. I didn't realise the impedance was as low as that. I don't want to be more or less shorting the Bitzie or Proprius outputs. Although the Proprius pot will be down low, adding quite a bit of fixed resistance to the output.
Graham, what was that Bitzie distortion? A warning sign that the output impedance is too low and too much current is being drawn? I obviously then kept the dial at 2 o'clock or less and the Alpair 5 sounded really good. Very clear neutral and tonally accurate sound. Not much bass but only listened without a baffle or box so far. Edited by Ash - 02 May 2017 at 9:31am |
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KJFAudio
Senior Member Joined: 17 Nov 2016 Location: Warwickshire UK Status: Offline Points: 119 |
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3.6 ohm is the average RE.
Likely much to low for a headphone amp, hopefully Graham will be along to give you advice on his specific amp. If you just added padding you'd likely reduce the distortion but also reduce the level. |
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UK/EU dealer for Mark Audio Drivers and Manufacturer of speaker kits
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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The Bitzie is able to drive the Mark Audio Alpair 5 Gen 2 speaker pair directly, to a more or less adequate listening level for earspeaker and close proximity listening.
Stefan, what is the impedance/resistance of the Alpair 5 Gen 2? Graham, I know I'm using the Bitzie outside of its intended purpose by driving a pair of small speakers with it but... beyond the 2-3 o'clock position on the Bitzie pot, distortion (compressed dynamic range) creeps into the playback so I can't use it any further clockwise. Is this problem due to the low impedance of what is being driven? My K1000 can play without distortion fully clockwise. Do I need to add in a fixed resistor of about 100 Ohms (or less??) on each channel. (I will also try connecting them through a pair of Proprius and get back to you)
Edited by Ash - 01 May 2017 at 8:17pm |
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Wiscos
Regular Joined: 10 Apr 2017 Status: Offline Points: 39 |
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Sounds a really interesting idea... Good luck with the experiment!
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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Finally took the time to order a pair of Alpair 5 Gen 2 in grey. I look forward to hooking them up to the Bitzie and having a listen. Stefan, if it's next day delivery, could you hang on to them and dispatch them on Tuesday so I am here to receive them on Wednesday?
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Ash
Senior Member Joined: 18 Mar 2013 Location: Dorset Status: Offline Points: 4334 |
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I'll have to hold the speakers out in front of my ears whilst they're playing and see if they sound promising. If so, I would have to make a simple headband for them or sew fixtures into a beanie hat or something to suspend them out in front of my face. It could be a useful listening reference for setting up the bigger MA drivers out in the room, which will be worth looking silly for. I'm not going back to conventional headphones as there is no further progress to be made down that route.
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KJFAudio
Senior Member Joined: 17 Nov 2016 Location: Warwickshire UK Status: Offline Points: 119 |
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Yes Mark is designing drivers but nothing up for new release soon. His health has taken some time obviously as has his new Sota range of finished speakers. Ash if you build those Alpair 5 headphones and come over here and let me do a photo shoot of you, I'll give you a permanent 10% voucher code! Stefan |
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UK/EU dealer for Mark Audio Drivers and Manufacturer of speaker kits
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