from what i understand, what happens here is, the amp sees less resistance on low impedance headphone, hence current will flow through more...
imagine water flowing through small river (high impedance) vs water flowing through large river (low impedance).

there will be too much current being drawn from the amp, hence amp overloaded.

as for the results of impedance adapter, i dont find it to my liking.
it reduces hiss, but at the same time it lowers high frequency info, making the sound more closed-in, less airy, or in my own way of saying, less natural ambience and decay.
some people actually uses this to get a better definition of bass, dropping hiss (or noise floor) allows more things to be heard, especially low level details.
but higher resistance also will reduce the strength of the sound, too much and u might end up filtering the soft sound altogether.

i think its better to improve the grounding for cutting down hiss, or the power line for more current output. but im not an amp builder, i cant say much.

Yeah, basic physics. Low resistance = High current, low voltage...and vice versa.

I'm not trying to cut down hiss, I'm trying to avoid frying the amp from prolonged usage at high volumes using low impedance outputs.....or how about I just don't lend it to my friends.

I guess if I were to buy one might as well not go crazy with numbers. Anything that can make the total impedance around 50+Ohm would be nice.

This post has been edited by tunertoobe: Jun 30 2011, 10:24 AM

Dont forget to give review for the jds

Sure thing!

Boss, what is the outcome from your test of SR-60i and impedance adapter (what ohm you use?) . Any promising effect in SQ.

Not really.
Did however require a bit more turn of the volume knob. Never notice anything significant. I think the bass was a bit more controlled when it went louder(than comfortable), but I'm not too sure.

Oh, in case you're asking where I got the adapter, a friend of mine lended it to me. I don't know where he got it from. Looks old though. Damn, I even forgot what impedance it was. I used it with the cMoyBB v2.03 with Bass Boost switched on, just FYI.

This post has been edited by tunertoobe: Dec 9 2011, 11:29 AM

Oo, ok. Don't test on your Atrio M5?

Yes...same story. Only this time the bass was.....for any bass head they would say good. For me, it was close to being absurd, almost funny. The amount was ridiculous.

Haha. Should recommend this to bro yuan415. He's been complaining bout his ES7 lack of bass

The amp is excellent for bringing up the bass. The SR60i became the perfect headphone for hard rock.

Perhaps sometimes later maybe I'll commit to impedance adapter test. Don't have any expectation, just curios though

Hehe, sure. Different source, different output will make the result differ greatly. It's really something to read about it, and then experiencing it for yourself.

This post has been edited by tunertoobe: Dec 9 2011, 11:44 AM

I've just tested 75 ohm impedance adapter for a few days.
Test subject:
phone - silver bullet, piano forte II
amp - 3move
The observation:
-Slight addition in bass department. Both silver bullet & piano forte II is not a bass phone, so its ok.
-Clean sound, i like
The price to pay for these: clipping the other part very much, high, middle, you name it. Sound very weird. Don't like it

Lesson I've learned:
-Dynamic and 75 ohm impedance adapter not good paired. 75 ohm is high. May be good if choose lower impedance? Don't know. maybe yes.
-Do not pair with bass phone, the bass will become too overwhelming (tunertoobe)
-75 ohm is good with high clarity BA IEM, originally intended for er4p.

impedance adapter, you meant this?


i've tried looking for it before, no luck so far.
i need it to control gain output for low impedance headphone when paired with amp, such as tubey. any place i could get this?

yupp, more or less the same plug. Got mine from ebay. Locally, you can order from more2teayap.

yup, can order from more2teayap.

hm3 made a good pair with 39 ohm impedance adapter. 75 ohm is no good.