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Posts by sacheie

In fact exaggerated subbass is one of the apparent problems with the setup (see my complaints of "low-frequency noise"), so if what you say is true perhaps the impedance mismatch is contributing to that issue.  I haven't had any objections to the highs, which with good tubes are sparkly and clean.  Overall, the LD seems to have a 'dark' sound character, although it brightened up a lot when I rolled the LT1364 for a while.
Magick Man, I agree normally an opamp should have lower output impedance.  My understanding is that the output transistors which come after the opamp, or perhaps the "Vbe multiplier," cause the elevated output Z.  Some discussion of the LD 1+ circuit can be found here: http://mail.audiokarma.net/forums/showthread.php?t=274126
Saying that it's acceptable to use "for headphones rated at 8-600 ohms" says nothing about the output impedance of the amp itself; it sounds more like a marketing statement than a measurement anyway.  Since David Zhezhe himself says it's 32 ohms in the link above, I don't see a reason to doubt it, but I'd be happy to hear people's independent measurements.  I'm fairly unlearned in electronics and wouldn't know how to go about doing that.   To judge whether the...
On this page (http://www.littledot.net/forum/viewtopic.php?t=868), David Zhezhe, AFAIK the owner of Little Dot, says the LD 1+ should have an output impedance of 32 ohms.  I understand that being a hybrid design, the 1+ will have lower output Z than most purely tube amps.  My specific question is why 32 ohms would be considered acceptable for 25-ohm cans like the D2000's if a 10:1 ratio is really ideal.  But like I said, the setup sounds good to me, so I can imagine a...
Greetings audiophiles, I am hoping you can shed some light on an acrimonious debate between my friend and me.  My friend is a fan of nwavguy, and he insists the 32 ohms output impedance of my Little Dot 1+ is disastrous for my Denon D2000's (which have 25 ohms impedance).  Sometimes I suspect the amp is overpowering the cans; rarely can I raise the volume past 9 o'clock.  I have seen people recommend a 1:10 ratio of output impedance to load impedance; if that advice is...
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