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milkpowder

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Posts posted by milkpowder

  1. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    ^^ :laugh:

    I'll fully assimilate what's been said tomorrow morning.

    Another slightly off-topic tangent: Malo, you mentioned current-based amps. Naim Audio is the first company that comes to mind (my mind anyway, since I spent a decent amount of time listening to them). Their power ratings are low and they boast high current design. Low wattage + high current = low voltage. In that case, how do the speaker diaphragms move? How is current related to displacement of the speaker cone? I've always been taught that it's the voltage (amplitude) that makes the cones move because the magnitude of the induced EMF is proportional to the rate of change of the magnetic flux linkage (to be understood inversely, in the case, since it's the change in EMF producing a change in magnetic flux linkage), a phrase I was made to remember when I was doing physics in high school ;)

    This is great physics revision:D

  2. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    Thanks MaloS. Good info.

    I don't have too many issues with the way amplifiers deal with voltage and how they react to driving different impedance loads. What I am still not certain about is how current changes depending on load. High AC voltages will blow a driver right out of the enclosure and high currents will melt voice coils. Is there anything wrong with this statement: an increase in voltage leads to higher current flow. Hence increasing volume (voltage), leads to higher current flow? Or should I say increase voltage => increase current and both contribute to increase in volume.

    The basic equations I'm looking at are I=V/Zload, P=VI, and the P=Vo^2/Zload. Are there others to consider? The answer is probably yes :D

    Anyhow, you guys are saying that it is definitely safe to run something like a K1000 (Zload: 120ohm) or electrostatic adapter box (Zload: 8ohms? ???) from a 10 gazillion Watt amplifier as long as the preamp is capable of finely controlling the volume to reasonable listening levels?

    One more stupid question before I retire: Why don't manufactures only make passive pre-amps and let the power amps do all the voltage/current gain? I understand that some sources give off minuscule voltages eg microphones and phono, so those may benefit from a bit of voltage gain so that you can actually accurately attenuate them.

  4. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    I thought you knew better than this, Jonathan. :P

    If you're only drawing say 1W from the amp, it makes no difference whether it's a 10W or 100W amp. That's just the maximum amount of power the amp is rated to output.

    If you were to plug a 100W lamp into a 5kW generator, the lamp doesn't explode in a massive fireball. Same idea.

    Crawls away in shame :'(

    Does the current drawn change depending on volume? I thought it was only the voltage that changes, is it not? If so, then won't the high current melt the voice coils say if I plugged a K1000 into a 350W amp even at low volumes? Argh... I'm confused. School taught me nothing about this sort of stuff. Feel free to PM me.

  11. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    You probably want a SRD-7 MkII at some point to try all kinds of speaker amps for that bassy, dynamic sound.

    One thing I would mention about HE60 is that it can take some EQ in the bass without distorting. I was surprised to find HE60 takes bass EQ better than K1000. Then again, even with only about 2dB bass EQ, I thought it was too much and preferred the HE60 without any EQ at all. Taken as a whole by itself without constant A-B'ing with say HD650, HE90, OII, HE60 bass does not sound lacking at all to me for my music.

    I'll give EQ (foobar) another try. Last time I tried, non-EQ seemed to sound a bit cleaner. (EDIT: 2db @ 55hz, 1db @ 77hz, 1db @ 110hz. No distortion so far)

    Can the SRD-7 take around 350W/ch/8ohms of power?

    Genre is why the AMT does so well when it does. For music that isn't heavy it can be glorious. I don't do a large amount of classical listening, but I do listen to a fair amount of acousticy stuff and my share of jazz and for those its fabby. Just can't cope with Deep Purple or Eiffel 65 properly though, although its vastly improved over how it sounded when I first got it. Maybe its the ESL57 of headphones.

    So the AMT/Aleph M isn't as good as you hoped it would be, but still a big improvement? It "sounds" (excuse the pun) like the AMT doesn't like it hard. No Jean-Michel Jarre then ;)

  13. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    When I sit down to listen to music, it is 90% classical. I don't usually listen to anything else. Portable listening is different. That's almost 100% rock and alt. For classical, the HE60 is superb. The bass is definitely sufficient. For the other 10%, I may listen to something like Nirvana, Coldplay, Chili Peppers, Dire Straits, Mike Oldfield, Norah Jones, etc and the quickness of the bass sometimes surprises me. There is no muddiness at all.

  14. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    Stax Omega 2. The HE60 was good but I'd want more time with one. TakeT H2 has the potential to go right up but we need a proper direct drive option to become accessible before sentence can be passed. The K1000 is right up there as well but again I'd want more time with it. R10 is good but really deflates when you factor price.

    Having spent time with the AMT out of the Aleph, I'm lowering it down. Unless the Ergo Amp 2 with its dynamic EQ really is the shit, then the AMT is stuck at the bottom of the top end. It suffers like the HE60 does, from lack of low end presence. When it gets it right it gets it so right though.

    The O2 really does bring a smile to your face whatever the music. It's sound signature is so easy on the ears.

    Apparently, the HE60's bass really improves with better amplification eg BH, KGSS, Woo GES. My wallet ain't big enough to find out :angel:

    How much heavier does the HE90 feel vs the HE60? I can't imagine the HE60 being terribly comfortable for people with large heads. They have the Senn clamp, but not quite as much as the HD6x0

  16. Speakers, high voltages, watts, etc

    in Headphones

    Posted

    SR-007 > SR-Ω > HE60 > SR-Lambda (open back) > SR-003

    Interesting that you prefer the HE60 over HE90? They must be good out of the BH. From my limited time with the SR-007, I think I'd also prefer the SR-007 over the HE60, but only by a hairs width. It's a completely different listening experience altogether.

  22. Ebay Insanity.

    in Headphones

    Posted

    UK'ers are just too used to overpaying for goods they loose their sanity... I just don't understand why people go crazy over vintage, probably poor-sounding non-dynamic headphones over here. I sold a pair of SR-404 for more than it would cost to buy a brand new one. Go figure ??? Oh well, all the better for those of us who might be selling gear on eBay >:D

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