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KSC-75 Aha! Look At Their Impedance

post #1 of 11
12/25/07 at 5:35pm
Thread Starter 
Well I have never seen or never heard. But today I just went onto see the Koss website just to see what they are planning near future. Just thought I should see KSC-75 as people praise them like SR-60s. Had a look at the tech specs and was taken aback having looked at their impedance rating. Are these efficiently driven by any portable player or need some solid source to get the most out of them? Just curious thats all, not intending to buy.
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post #2 of 11
12/25/07 at 5:38pm
They are very efficient. You can blast them to deafening ranges even by portable devices, and even in good quality too. Its based on PortaPro afterall.
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post #3 of 11
12/25/07 at 5:43pm
They are quite efficient. Impedance isn't quite everything when it comes to driving headphones. Sensitivity is also a factor and the KSC 75's have a slightly higher sensitivity rating than Grado's. From personal experience, I find the KSC75's more easily driven than my Grado's.

You should give them a shot! Even if they are technically inferior to the headphones in your signature, they are a very fun pair. Sometimes I find myself putting them on in lieu of my other headphones (see profile) even at home!
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post #4 of 11
12/25/07 at 9:06pm
Well not my favorites, but wery powerfull (maybe too much) and easy to drive.
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post #5 of 11
12/25/07 at 9:14pm
PP are 60 Ohms IIRC, but the sensitivity is an astonishing, 101dB/mW, the CD3K one of the most sensitive heapdhones out there is rated to 103dB/mW...

That is the in range of IEM if you ask me...my Panasonic 570 drives them to a normal listening levels, sometimes a little loud, depending on how hot the recording was made, but not deafening levels, OK?
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post #6 of 11
12/25/07 at 9:24pm
i love my kscs. the sound amazing out of the box.

but i have never heard a pair of headphones scale up so well with an amplifier.
the difference is massive. the everything tightens up, especially the bass.
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post #7 of 11
12/25/07 at 9:29pm
Thread Starter 
I just want to listen to them atleast once as people just rave about them. I don't know for some reason I don't prefer on ears and I am always a fullsize fan. I don't see on ears providing SQ as I get with Fullsize or IEMs.
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post #8 of 11
12/25/07 at 9:29pm
They are super efficient. I have to operate them with a volume adjustment adapter to keep them from blasting my ear drums.

High impedance does not imply poor engineering. Higher end headphones have a tendency to have higher impedance. It does not mean low impedance Grados perform worse either. Grados are very good headphones too and some of them, although rated at low impedance, will require quite an amp before they can reach their potential.
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post #9 of 11
12/25/07 at 9:31pm
[rant] Loudness depends on the output impedance of the amp, the output of the amp, the impedance of the headphones and the sensitivity of the headphones.

The amount of power reaching the headphones depends on the impedance match between the amp's output impedance and the impedance of the headphones. The closer the two impedances match, the more power that reaches the headphones. You use the amount of power reaching the headphones to determine how loud the headphones will get.

Looking at a headphone's impedance by itself is like figuring out your car's mileage by looking only at the horsepower. It *is* related, but you *cannot* figure out what's going on with that one figure. [/rant]
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post #10 of 11
12/25/07 at 9:41pm
Quote:
Originally Posted by Uncle Erik View Post
[rant] Loudness depends on the output impedance of the amp, the output of the amp, the impedance of the headphones and the sensitivity of the headphones.

The amount of power reaching the headphones depends on the impedance match between the amp's output impedance and the impedance of the headphones. The closer the two impedances match, the more power that reaches the headphones. You use the amount of power reaching the headphones to determine how loud the headphones will get.

Looking at a headphone's impedance by itself is like figuring out your car's mileage by looking only at the horsepower. It *is* related, but you *cannot* figure out what's going on with that one figure. [/rant]
That may be true, but as a side note I can tell you that in all places I hooked my CD3K on, the volume was really loud, very loud in comparison to the rest of the cans around, so something indicates that the figure has a meaning, also the K-1000 has a 74dB/mW or something like that, and it needs a lot of power to work fine, regardless of what impedance in the amp you use...
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post #11 of 11
12/25/07 at 11:14pm
Quote:
Originally Posted by Uncle Erik View Post
The amount of power reaching the headphones depends on the impedance match between the amp's output impedance and the impedance of the headphones. The closer the two impedances match, the more power that reaches the headphones. You use the amount of power reaching the headphones to determine how loud the headphones will get.
i dont think thats right.
the output impedance of the amp has NO absolute effect on the ability (or inability) to deliver power to a load. output impedance will have an effect on amp/driver damping factors, but an amp with a high output impedance can theoretically put LOTS of power into a low impedance load. the low-impedance amp driving high impedance loads is also well known.

the power through a driver is the same as any other load. measure 2: current through the load, voltage across the load, or load impedance and bust out the calculator. depending on your mood and honesty you can use RMS values, or P-P values for audio.
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