[?oA?]

http://www.jddsy.com/nubb/non/Forum12/HTML/027128.html
this unit could play mp3 disc

 

[blr]

Looks cool, basically like their new MD recorder.
I guess these panels on the sides of docking station are mini speakers.
The only thing I wonder is how it sounds, particularly from its headout (and my hopes are not extremely high there)

 

[Mystyler]

Looks like a larger MJ90 MDP with the MJ50's recharging cradle...

Nice looking certainly, but does anyone know if it has optical out?

 

[Joe Bloggs]

Further down that thread somebody said that that thing looks more like a pMDp and we've been had. I agree with him

 

[leon]

The press release said very little about the CDP's features *pfft*

But hey, here's a new MD player from Panasonic

http://www.watch.impress.co.jp/av/do...20809/pana.htm

maximum 193-hour playback, probably achieved by cutting amp output (it is now 3+3mW @ 32ohm, down from 3.5+3.5 @ 22). It also has headphone surround, but the press release says nothing about how it works.

 

[Mystyler]

Quote:

Originally posted by leon maximum 193-hour playback, probably achieved by cutting amp output (it is now 3+3mW @ 32ohm, down from 3.5+3.5 @ 22). It also has headphone surround, but the press release says nothing about how it works.

At least it ain't as low as the E909's...from what I know, that's 3.5mW @ 16 ohms...

 

[leon]

Quote:

Originally posted by Mystyler At least it ain't as low as the E909's...from what I know, that's 3.5mW @ 16 ohms...

Honey... I think 3+3 @ 32ohm is actually lower than the E909's output.

 

[Mystyler]

Not by my logic.

If you were to plug some MX500s, with an impedence of 32 ohms, the you should be able to get 3mW per channel with the Panasonic. If you were to do the same with the Sony E909, then you'd get 1.75mW per channel, if you connected some cans with 40 ohm impedence, the the Panasonic should provide 2.4mW per channel, and the Sony E909 1.4mW per channel...

 

[leon]

Want to explain that a bit? I always thought, let's say, in the case of
5+5mW @ 16ohm and
5+5mW @ 32ohm,
the one rated at 32ohm is the less powerful one.
Are you using V=IR or some other equation?

 

[Duncan]

The Sony output should be the louder of the two...

Think about putting 3mw into Senn HD580s at 300 ohms, you'd hear nothing... whereas, putting 3mw into a pair of E888s will (for most people) blow your eardrums out...

32ohm 'phones will be louder on 16ohm equipment than the other way around (at the same mw level) so far as I know... but, that is by no means conclusive... i'm really as confused as the rest of you

 

[Mystyler]

I'll certainly explain.

This is what I came up with after trying to figure out why an extra .3mW made my Aiwa so much louder than my Panasonic, and louder than 5mW Sonys. Also why the Panasonic was pretty much level with Sony, but with less mW. So I figured that it had to be something do do with the unit's rated amp impedence.

So to me, when Sony claims a 5mW amp at 16 ohms, that means when you plug in some 16 ohm headphones (is there such a thing?) you'll be able to get 5mW per channel running through the 'phones. This also made me think that if you were to use cans with twice the resistance, you'd only get half as much power running through them. But to work out, say cans with 40 ohm impedence I came up with this:

Sony standard headphone amp (not E909 AFAIK) is 5mW x2 @ 16 ohms.
Therefore to find the power supplied to 40 ohm cans:
16/40=0.4
Then multiply the amp's rated output at 16 ohms by the above number, in this case, 0.4:
0.4*5=2mW per channel.

For my Aiwa:
32/40=0.8
0.8*3.8=3.04mW per channel.

For my Panasonic:
22/40=0.55
0.55*3.5=1.925mW per channel.

For the new MJ15:
32/40=0.8
0.8*3=2.4mW per channel

For E909:
16/40=0.4
0.4*3.5=1.4mW per channel

For most Sharp units:
32/40=0.8
0.8*5=4mW per channel.

It works for any impedence, but the lower the impedence of your cans, the more favourable Sony units will be over Panasonics. However, the higher the can's impedence, the more equal they become. That is what I've found. eg, for D66 eggos with 24 ohm impedence:

Standard Sony:
16/24=0.66
0.66*5=3.33mW per channel

Standard Panasonic:
22/24=0.9166
0.9166*3.5=3.208mW per channel

For 16 ohm headphones:
SS:
16/16=1
1*5=5mW per channel

SP:
22/16=1.375
1.375*3.5=4.81mW per channel

Just for fun:
16/300=0.0533
0.0533*5=0.266mW per channel

22/300=0.0733
0.0733*3.5=0.2566mW per channel

This could also explain why people find that cans such as KSC35s sound so soft on their PMDU.

I have no idea if this is right, but when I came up with it, seemed to explain a lot.

P.S. Sorry this is long, I hope it is clear enough though!

 

[leon]

Right... I remember having read somewhere that doubling impedance (meaning, say, rated at 32 ohm instead od 16) doesn't simply double anything or halve anything... and that with lower impedance phones it's more about current (off topic)...

But I guess the thing I don't think is the case is usually the case, so there we go.

 

[Joe Bloggs]

It's true you know. If the impedance used to state the power / current output and the impedance of your phones are too far apart it's impossible to accurately predict the power output to your phones without some knowledge of the inner workings of the amp.

 

[Mystyler]

Well, I don't know much about headphone amps/impedence/blah, so if anyone actually knows how the heck to work this stuff out properly then tell us!

Until then, I'm just going to use this method. It may not be right, but it seems right, and I don't have any really high impedence cans either...I'm maxed out at 32 ohms with me MX500s!

 

[acidtripwow]

What's the model number on that Panasonic PCDP? I wonder if Audio Cubes will carry it.