"A standard CD player outputs signal at 24V"

wwenze · 9th July 2009, 11:52 PM

Quote:

Most portable devices are powered by USB and their power supply is limited to 5V. This means the output of the signal is limited to the maximum of 5V. On the other hand, a full scale component like a CD / DVD player has no such constraint, a standard CD player will happily output signal at 24V (+/-12V DC)

A standard amplifier that is designed to accept the standard 24V line input is going to struggle to deal with the 5V input. The end result is a 100W rated power amplifier struggling to produce 23W. That is why it does not sound right!

http://www.bursonaudio.com/burson_buffer_160.htm

O.o

I don't know what kind of standard those guys live with.

DigitalJunkie · 10th July 2009, 02:30 AM

That graph shown with the various output levels is...not right... IME.
PC soundcards generally have a level LOWER than that of an Ipod,cd player,etc.I have yet to run across a 'consumer' soundcard that outputs an actual line-level signal. They have all been about half that.

stephensank · 10th July 2009, 04:32 PM

Standard CD maximum output level is 2V RMS. Even the peak to peak equivalent voltage of that is less than 6V. Most power amplifiers are designed with a gain set to output maximum wattage with a 0.5V RMS input. "Standard' line level is generally regarded as between 0.5V to 1V RMS. I don't know where the heck they got that 24V rubbish. It can be the max peak to peak voltage output of an active stage/opamp supplied at +/-12VDC, but it absolutely is NOT any kind of standard output level for any cd, sacd or etc.

EUVL · 11th July 2009, 04:38 AM

2.4V and 0.5V is about right.
Perhaps their amp has a gain of 10 ?

P.

cbdb · 11th July 2009, 06:08 AM

That page is full of rubish, not only is the 24V thing wrong but the impedance matching is a total red herring. It only applies to power transfer, which has nothing to do with transfering a signal from preamp to power amp.

Not to mention the terrible english:

Quote:

In the recent years one of the phenomenal is the raise of PC /Laptop / IPOD base audio system. The easy of use; the scalability of such system and the new loss less compression

Are you sure this isnt a joke?

wwenze · 11th July 2009, 06:24 AM

Strange that they managed to find the output impedance figures of the CDPs to put on their web, yet miss totally the output level figures which is right next to it on the specifications page.

cdbd - "Are you sure this isnt a joke?", well, it is much more scary to know that this company has long been in existence and the Burson op-amp is in fact pretty well-known, and not too long ago someone had started a thread about it: Op-Amps advice

analog_sa · 11th July 2009, 07:40 AM

Quote:

Originally posted by wwenze

I don't know what kind of standard those guys live with.

The 1000% + profit margins can skew perception a bit. The important thing is diyers love them.

Steerpike · 11th July 2009, 01:58 PM

Quote:

powered by USB and their power supply is limited to 5V

They are assembling circuitry and don't yet know about DC-DC converters?

awpagan · 11th July 2009, 02:18 PM

burson credibility

http://www.diyaudio.com/forums/showt...185&highlight=

I still think these people make them, and Burson re-label them.
http://www.audio-gd.com/En%20audio-gd.htm

scott wurcer · 11th July 2009, 03:02 PM

Quote:

Originally posted by awpagan
burson credibility

11th July 2009, 02:18 PM	#9
awpagan diyAudio Member Join Date: Nov 2004 Location: sydney	burson credability burson credibility http://www.diyaudio.com/forums/showt...185&highlight= I still think these people make them, and Burson re-label them. http://www.audio-gd.com/En%20audio-gd.htm __________________ Indecision makes the world gone round. Maybe

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10th July 2009, 02:30 AM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	That graph shown with the various output levels is...not right... IME. PC soundcards generally have a level LOWER than that of an Ipod,cd player,etc.I have yet to run across a 'consumer' soundcard that outputs an actual line-level signal. They have all been about half that.

10th July 2009, 04:32 PM	#3
stephensank diyAudio Member Join Date: Oct 2006	Standard CD maximum output level is 2V RMS. Even the peak to peak equivalent voltage of that is less than 6V. Most power amplifiers are designed with a gain set to output maximum wattage with a 0.5V RMS input. "Standard' line level is generally regarded as between 0.5V to 1V RMS. I don't know where the heck they got that 24V rubbish. It can be the max peak to peak voltage output of an active stage/opamp supplied at +/-12VDC, but it absolutely is NOT any kind of standard output level for any cd, sacd or etc.

11th July 2009, 04:38 AM	#4
EUVL diyAudio Member Join Date: Oct 2003	2.4V and 0.5V is about right. Perhaps their amp has a gain of 10 ? P.

11th July 2009, 06:24 AM	#6
wwenze diyAudio Member Join Date: Mar 2008	Strange that they managed to find the output impedance figures of the CDPs to put on their web, yet miss totally the output level figures which is right next to it on the specifications page. cdbd - "Are you sure this isnt a joke?", well, it is much more scary to know that this company has long been in existence and the Burson op-amp is in fact pretty well-known, and not too long ago someone had started a thread about it: Op-Amps advice

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