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R25-R30 when driving headphones and using as source for speaker poweramp
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Just a quick question regarding the IVY-3 and Buffalo 2 combination... I am in the middle of building the IVY 3 and I want to use this to power 'phones in balanced mode and a power amp for my speakers. In the manual it says:
The IVY-III can easily drive most headphones (even down to 16Ω) when used as a balanced headphone driver along
with the Volumite or similar digital volume control. The SE outputs are not capable of as much power, but can still be
used for most headphones. It is recommended that if you wish to drive headphones you use jumpers for R25/R26
and/or R27-R30, which will allow for better damping factor. The OPA1632 can drive up to 150mA, giving you plenty
of power for almost any headphone listening situation. It is recommended when driving power amps to always use the
output resistors, especially with very capacitive cables.
So... for my setup where I want to be able to drive headphones and use the B-2 with a power amp, do I jumper R25-R30 or do I include them all, or what?
Cheers guys
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Install the resistors. Use the terminal block outputs to drive your amplifier, then tap the headphone jack off the input side of the resistors. Brian Donegan attached the following image(s):  IVY_hp_tap.jpg (25kb) downloaded 272 time(s).You cannot view/download attachments. Try to login or register.
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Thanks! and I assume I leave R32-35 completely empty, no resistors at all?
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Yes. They are for the Voltage Inputs, which you will not be using.
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Hi Brian, can you repost the pic you attached of tapping the 4 pin XLR from the resistors? I'll make sure to save it then.
Cheers
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Hello Brian/Russ,
What is the purpose of these resistors?. Are these for stability if the interconnects are long and/or have high capacitance? If your interconnects are short (I use cat5 cable) can you omit them when driving an amp?
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Please advise on the wiring to 3 wired (Left+, Right+, common ground) headphone. Thank you any advise! Edited by user Saturday, November 13, 2010 8:31:35 PM(UTC)
| Reason: Not specified
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You have to use the single ended output.
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It is stated that the single ender output is not as capable of driving headphones. I have some old AD9630 lying around. Would it make sense to add these as a small headphone buffer amp? Also would it give any performance gains of the ivy to add a big (say 40000uF) capacitor bank before the placid? I am not talking cost/benefit. I simply have some unused stuff lying around. Edited by user Thursday, June 2, 2011 2:39:47 PM(UTC)
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Just wondering if, when driving balanced headphones (HD600) from a dual-Buffalo/dual-Ivy III set-up, I should still bypass the resistors?
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 1 user thanked Russ White for this useful post.
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Thanks Russ. If you would, then I will.
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R25-R30 when driving headphones and using as source for speaker poweramp
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