Can I use 600 impedence headphones with a portable cd player? And will
I be able to hear anything, my cd player puts out 12 mw per channel.

In article ,
buildmorelines wrote:
Can I use 600 impedence headphones with a portable cd player?

Yes, but it won't be very loud.

And will
I be able to hear anything, my cd player puts out 12 mw per channel.

Into what load? Knowing the power doesn't tell you anything if you don't
know what impedance it's measured into.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

In article ,
buildmorelines wrote:
Can I use 600 impedence headphones with a portable cd player?

Yes, but it won't be very loud.

And will
I be able to hear anything, my cd player puts out 12 mw per channel.

Into what load? Knowing the power doesn't tell you anything if you don't
know what impedance it's measured into.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"buildmorelines" wrote in message
om

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw per
channel.

We need to know the impedance into which that 12 mw rating relates and the
sensitivity of the headphones expressed in dB per mw.

"buildmorelines" wrote in message
om

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw per
channel.

We need to know the impedance into which that 12 mw rating relates and the
sensitivity of the headphones expressed in dB per mw.

In article writes:

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw per channel.

You'll be able to hear something. It may not be very loud though,
depending on the sensitivity of the headphones. There really is no
good way to predict how loud without more data than you probably have.
Just try them and see if they're loud enough.


--
I'm really Mike Rivers )
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me he double-m-eleven-double-zero at yahoo

In article writes:

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw per channel.

You'll be able to hear something. It may not be very loud though,
depending on the sensitivity of the headphones. There really is no
good way to predict how loud without more data than you probably have.
Just try them and see if they're loud enough.


--
I'm really Mike Rivers )
However, until the spam goes away or Hell freezes over,
lots of IP addresses are blocked from this system. If
you e-mail me and it bounces, use your secret decoder ring
and reach me he double-m-eleven-double-zero at yahoo

"Arny Krueger" wrote in message ...
"buildmorelines" wrote in message
om

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw per
channel.

We need to know the impedance into which that 12 mw rating relates and the
sensitivity of the headphones expressed in dB per mw.


The cd player is a Iriver imp-350.

http://www.iriveramerica.com/products/iMP-350.aspx

Channels Stereo ( Left and Right)
Frequency / Range 20Hz ~ 20KHz
Headphone Out 12mW (L)+ 12mW (R) : (16Ω) Max. Volume)
Line Out Level 0.57V rms : (47kΩ) Max. Volume
S/N Ratio 90dB (CD-DA), 90dB (MP3 CD);
Frequency 2dB (Line Out)


and the headphones I have in mind are AKG 240 monitor headphones,

Model:
K 240 M Professional Headphones
Specs:
Type: Semi-open, Circumaural Frequency Range: 15Hz to 20kHz
Sensitivity: 88dB/mW Rated Impedance: 600O Weight: 240g (8.5 oz.)

"Arny Krueger" wrote in message ...
"buildmorelines" wrote in message
om

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw per
channel.

We need to know the impedance into which that 12 mw rating relates and the
sensitivity of the headphones expressed in dB per mw.


The cd player is a Iriver imp-350.

http://www.iriveramerica.com/products/iMP-350.aspx

Channels Stereo ( Left and Right)
Frequency / Range 20Hz ~ 20KHz
Headphone Out 12mW (L)+ 12mW (R) : (16Ω) Max. Volume)
Line Out Level 0.57V rms : (47kΩ) Max. Volume
S/N Ratio 90dB (CD-DA), 90dB (MP3 CD);
Frequency 2dB (Line Out)


and the headphones I have in mind are AKG 240 monitor headphones,

Model:
K 240 M Professional Headphones
Specs:
Type: Semi-open, Circumaural Frequency Range: 15Hz to 20kHz
Sensitivity: 88dB/mW Rated Impedance: 600O Weight: 240g (8.5 oz.)

buildmorelines wrote:
The cd player is a Iriver imp-350.

http://www.iriveramerica.com/products/iMP-350.aspx

Channels Stereo ( Left and Right)
Frequency / Range 20Hz ~ 20KHz
Headphone Out 12mW (L)+ 12mW (R) : (16Ω) Max. Volume)
Line Out Level 0.57V rms : (47kΩ) Max. Volume
S/N Ratio 90dB (CD-DA), 90dB (MP3 CD);
Frequency 2dB (Line Out)

Not a single one of these numbers is actually meaningful. These are
not measurements, this is marketing bull****.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

buildmorelines wrote:
The cd player is a Iriver imp-350.

http://www.iriveramerica.com/products/iMP-350.aspx

Channels Stereo ( Left and Right)
Frequency / Range 20Hz ~ 20KHz
Headphone Out 12mW (L)+ 12mW (R) : (16Ω) Max. Volume)
Line Out Level 0.57V rms : (47kΩ) Max. Volume
S/N Ratio 90dB (CD-DA), 90dB (MP3 CD);
Frequency 2dB (Line Out)

Not a single one of these numbers is actually meaningful. These are
not measurements, this is marketing bull****.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."

"buildmorelines" wrote in message
om...
Can I use 600 impedence headphones with a portable cd player? And will
I be able to hear anything, my cd player puts out 12 mw per channel.


As Scott, Mike, and Arny suggest, it depends on the particulars and the
manufacturer's specs are unfortunately useless marketing blather. However,
experience is a guide: many people complain about the AKG 600-ohm phones
being too quiet, even with sources that can deliver a lot more power than
your iRiver likely can.

It's very unlikely that 12mW spec applies to 600 ohms phones. If we imagine
it applies to the more common 64 ohm phones, then it is likely that it can
only deliver around 1mW to the 600 ohm phones; and for the AKG 240's, which
are relatively inefficient, that converts to about 88dB max SPL, which is
not very loud by any standard. And even that 12mW might be at an
unacceptably high distortion level.

You may be an exception, depending on your goals, environment, and the
sensitivity of your ears. I expect you will find that they sound nice but
that you can't get them adequately loud.

"buildmorelines" wrote in message
om...
Can I use 600 impedence headphones with a portable cd player? And will
I be able to hear anything, my cd player puts out 12 mw per channel.


As Scott, Mike, and Arny suggest, it depends on the particulars and the
manufacturer's specs are unfortunately useless marketing blather. However,
experience is a guide: many people complain about the AKG 600-ohm phones
being too quiet, even with sources that can deliver a lot more power than
your iRiver likely can.

It's very unlikely that 12mW spec applies to 600 ohms phones. If we imagine
it applies to the more common 64 ohm phones, then it is likely that it can
only deliver around 1mW to the 600 ohm phones; and for the AKG 240's, which
are relatively inefficient, that converts to about 88dB max SPL, which is
not very loud by any standard. And even that 12mW might be at an
unacceptably high distortion level.

You may be an exception, depending on your goals, environment, and the
sensitivity of your ears. I expect you will find that they sound nice but
that you can't get them adequately loud.

"buildmorelines" wrote in message
om
"Arny Krueger" wrote in message
...
"buildmorelines" wrote in message
om

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw
per channel.

We need to know the impedance into which that 12 mw rating relates
and the sensitivity of the headphones expressed in dB per mw.


The cd player is a Iriver imp-350.

http://www.iriveramerica.com/products/iMP-350.aspx

Channels Stereo ( Left and Right)
Frequency / Range 20Hz ~ 20KHz
Headphone Out 12mW (L)+ 12mW (R) : (16Ω) Max. Volume)

I checked the website, and this line basically says 12 mw per channel into a
16 ohm load while playing a CD. This drops to 10 mw per channel when playing
FM.

This works out to be 1.386 volts

and the headphones I have in mind are AKG 240 monitor headphones,

Model:
K 240 M Professional Headphones
Specs:
Type: Semi-open, Circumaural Frequency Range: 15Hz to 20kHz
Sensitivity: 88dB/mW Rated Impedance: 600O Weight: 240g (8.5 oz.)

1 mw into 600 ohms is 0.775 volts, so 0.775 volts gives a 88 dB output.

1.386 volts is about 5 dB above 0.775 volts, so at max output while playing
a CD, the K240 headphones will be generating 93 dB.

Regrattably, we don't know what frequency the headphones rated sensitivity
is specified at, or what the headphones frequency response looks like. So,
the 93 dB number is somewhat meaningless.

I get the feeling that this is not a match made in heaven, if listening loud
is your goal.

"buildmorelines" wrote in message
om
"Arny Krueger" wrote in message
...
"buildmorelines" wrote in message
om

Can I use 600 impedence headphones with a portable cd player?

Yes.

And will I be able to hear anything, my cd player puts out 12 mw
per channel.

We need to know the impedance into which that 12 mw rating relates
and the sensitivity of the headphones expressed in dB per mw.


The cd player is a Iriver imp-350.

http://www.iriveramerica.com/products/iMP-350.aspx

Channels Stereo ( Left and Right)
Frequency / Range 20Hz ~ 20KHz
Headphone Out 12mW (L)+ 12mW (R) : (16Ω) Max. Volume)

I checked the website, and this line basically says 12 mw per channel into a
16 ohm load while playing a CD. This drops to 10 mw per channel when playing
FM.

This works out to be 1.386 volts

and the headphones I have in mind are AKG 240 monitor headphones,

Model:
K 240 M Professional Headphones
Specs:
Type: Semi-open, Circumaural Frequency Range: 15Hz to 20kHz
Sensitivity: 88dB/mW Rated Impedance: 600O Weight: 240g (8.5 oz.)

1 mw into 600 ohms is 0.775 volts, so 0.775 volts gives a 88 dB output.

1.386 volts is about 5 dB above 0.775 volts, so at max output while playing
a CD, the K240 headphones will be generating 93 dB.

Regrattably, we don't know what frequency the headphones rated sensitivity
is specified at, or what the headphones frequency response looks like. So,
the 93 dB number is somewhat meaningless.

I get the feeling that this is not a match made in heaven, if listening loud
is your goal.

"Arny Krueger" wrote in message
...
I checked the website, and this line basically says 12 mw per channel into
a 16 ohm load while playing a CD. This drops to 10 mw per channel when
playing FM.

This works out to be 1.386 volts

Arny, I'm afraid you've slipped a decimal. P = V^2/R == V = sqrt(P*R) =
0.438V. (Your voltage would give 120mW, not 12mW.)

Into 600 ohms, that's P = 0.32mW. That is, if 1mW = 88dB, only 83dB. Use
'em at the library, but not on the bus.

"Arny Krueger" wrote in message
...
I checked the website, and this line basically says 12 mw per channel into
a 16 ohm load while playing a CD. This drops to 10 mw per channel when
playing FM.

This works out to be 1.386 volts

Arny, I'm afraid you've slipped a decimal. P = V^2/R == V = sqrt(P*R) =
0.438V. (Your voltage would give 120mW, not 12mW.)

Into 600 ohms, that's P = 0.32mW. That is, if 1mW = 88dB, only 83dB. Use
'em at the library, but not on the bus.

"Walter Harley" wrote in message

"Arny Krueger" wrote in message
...
I checked the website, and this line basically says 12 mw per
channel into a 16 ohm load while playing a CD. This drops to 10 mw
per channel when playing FM.

This works out to be 1.386 volts

Arny, I'm afraid you've slipped a decimal. P = V^2/R == V = sqrt(P*R) =
0.438V. (Your voltage would give 120mW, not 12mW.)

Thanks for the correction.

0.438v is a relatively low output voltage for even a portable player. A 3
volt supply can generally get close to a volt.

Into 600 ohms, that's P = 0.32mW. That is, if 1mW = 88dB, only 83dB.
Use 'em at the library, but not on the bus.

Agreed.

"Walter Harley" wrote in message

"Arny Krueger" wrote in message
...
I checked the website, and this line basically says 12 mw per
channel into a 16 ohm load while playing a CD. This drops to 10 mw
per channel when playing FM.

This works out to be 1.386 volts

Arny, I'm afraid you've slipped a decimal. P = V^2/R == V = sqrt(P*R) =
0.438V. (Your voltage would give 120mW, not 12mW.)

Thanks for the correction.

0.438v is a relatively low output voltage for even a portable player. A 3
volt supply can generally get close to a volt.

Into 600 ohms, that's P = 0.32mW. That is, if 1mW = 88dB, only 83dB.
Use 'em at the library, but not on the bus.

Agreed.

"Arny Krueger" wrote in message
...
0.438v is a relatively low output voltage for even a portable player. A 3
volt supply can generally get close to a volt.

Yeah, seems odd.

I keep waiting for four-wire headphones, so that they can use bridging amps
to get twice the voltage. But I guess the trend is instead to move to
lower-impedance phones so they can get more power with the same voltage.

"Arny Krueger" wrote in message
...
0.438v is a relatively low output voltage for even a portable player. A 3
volt supply can generally get close to a volt.

Yeah, seems odd.

I keep waiting for four-wire headphones, so that they can use bridging amps
to get twice the voltage. But I guess the trend is instead to move to
lower-impedance phones so they can get more power with the same voltage.

"Walter Harley" wrote in message ...
"buildmorelines" wrote in message
om...
Can I use 600 impedence headphones with a portable cd player? And will
I be able to hear anything, my cd player puts out 12 mw per channel.


As Scott, Mike, and Arny suggest, it depends on the particulars and the
manufacturer's specs are unfortunately useless marketing blather. However,
experience is a guide: many people complain about the AKG 600-ohm phones
being too quiet, even with sources that can deliver a lot more power than
your iRiver likely can.

It's very unlikely that 12mW spec applies to 600 ohms phones. If we imagine
it applies to the more common 64 ohm phones, then it is likely that it can
only deliver around 1mW to the 600 ohm phones; and for the AKG 240's, which
are relatively inefficient, that converts to about 88dB max SPL, which is
not very loud by any standard. And even that 12mW might be at an
unacceptably high distortion level.

You may be an exception, depending on your goals, environment, and the
sensitivity of your ears. I expect you will find that they sound nice but
that you can't get them adequately loud.

I am trying to find some ambiant noise killing (cover ear and seal
it), very high sound quality (so I dont need to turn up the volume to
hear faint techno/pop samples that are getting drowned out by the beat
in songs (commercial/mainstream ones)).

"Walter Harley" wrote in message ...
"buildmorelines" wrote in message
om...
Can I use 600 impedence headphones with a portable cd player? And will
I be able to hear anything, my cd player puts out 12 mw per channel.


As Scott, Mike, and Arny suggest, it depends on the particulars and the
manufacturer's specs are unfortunately useless marketing blather. However,
experience is a guide: many people complain about the AKG 600-ohm phones
being too quiet, even with sources that can deliver a lot more power than
your iRiver likely can.

It's very unlikely that 12mW spec applies to 600 ohms phones. If we imagine
it applies to the more common 64 ohm phones, then it is likely that it can
only deliver around 1mW to the 600 ohm phones; and for the AKG 240's, which
are relatively inefficient, that converts to about 88dB max SPL, which is
not very loud by any standard. And even that 12mW might be at an
unacceptably high distortion level.

You may be an exception, depending on your goals, environment, and the
sensitivity of your ears. I expect you will find that they sound nice but
that you can't get them adequately loud.

I am trying to find some ambiant noise killing (cover ear and seal
it), very high sound quality (so I dont need to turn up the volume to
hear faint techno/pop samples that are getting drowned out by the beat
in songs (commercial/mainstream ones)).

I am trying to find some ambiant noise killing (cover ear and seal
it), very high sound quality (so I dont need to turn up the volume to
hear faint techno/pop samples that are getting drowned out by the beat
in songs (commercial/mainstream ones)).

I don't understand the point of "critical" listening using portable equipment.

I am trying to find some ambiant noise killing (cover ear and seal
it), very high sound quality (so I dont need to turn up the volume to
hear faint techno/pop samples that are getting drowned out by the beat
in songs (commercial/mainstream ones)).

I don't understand the point of "critical" listening using portable equipment.

"William Sommerwerck" wrote in message
...
I am trying to find some ambiant noise killing (cover ear and seal
it), very high sound quality (so I dont need to turn up the volume to
hear faint techno/pop samples that are getting drowned out by the beat
in songs (commercial/mainstream ones)).

I don't understand the point of "critical" listening using portable
equipment.

Not to mention portable MP3 players, like the iRiver. (Maybe the OP is only
thinking in terms of redbook CD's, but as I see it the iRiver's main billing
is as an MP3 player.)

MP3 is a format intentionally designed to take details that are hard to
notice, and delete them altogether... that's called "psychoacoustics" and
it's an important part of how lossy compression works.

"William Sommerwerck" wrote in message
...
I am trying to find some ambiant noise killing (cover ear and seal
it), very high sound quality (so I dont need to turn up the volume to
hear faint techno/pop samples that are getting drowned out by the beat
in songs (commercial/mainstream ones)).

I don't understand the point of "critical" listening using portable
equipment.

Not to mention portable MP3 players, like the iRiver. (Maybe the OP is only
thinking in terms of redbook CD's, but as I see it the iRiver's main billing
is as an MP3 player.)

MP3 is a format intentionally designed to take details that are hard to
notice, and delete them altogether... that's called "psychoacoustics" and
it's an important part of how lossy compression works.