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
I don't know what kind of standard those guys live with.
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.
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.
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:
Are you sure this isnt a joke?
Not to mention the terrible english:
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?
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: http://www.diyaudio.com/forums/showthread.php?s=&threadid=146876
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: http://www.diyaudio.com/forums/showthread.php?s=&threadid=146876
wwenze said:
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.
powered by USB and their power supply is limited to 5V
They are assembling circuitry and don't yet know about DC-DC converters?
burson credability
burson credibility
http://www.diyaudio.com/forums/showthread.php?s=&threadid=79185&highlight=
I still think these people make them, and Burson re-label them.
http://www.audio-gd.com/En audio-gd.htm
burson credibility
http://www.diyaudio.com/forums/showthread.php?s=&threadid=79185&highlight=
I still think these people make them, and Burson re-label them.
http://www.audio-gd.com/En audio-gd.htm
EUVL said:Perhaps their amp has a gain of 10 ?
Or perhaps their math has a gain of 10? Divide the numbers by 10 and they make more sense.
I sure don't want a CD player that outputs 12V RMS!!
Weird.......
Emailed to Burson sales dept:
Dear Sir,
Your discussion of standard signal line level on your website (http://www.bursonaudio.com/burson_buffer_160.htm) is wholly inaccurate.
If this is an honest error and it is not your intention to sell your products on the back of lies, I trust you will remove the inaccurate information immediately.
Dear Sir,
Your discussion of standard signal line level on your website (http://www.bursonaudio.com/burson_buffer_160.htm) is wholly inaccurate.
If this is an honest error and it is not your intention to sell your products on the back of lies, I trust you will remove the inaccurate information immediately.
sharpi31 said:I trust you will remove the inaccurate information immediately.
Well said. (Or written).
I wonder if they will remove the numerous spelling errors too.
They did remove the inaccurate information immediately and replaced it with something less glaring but still as unconvincing.
The impedance mismatch part stayed and is used on the PC AUDIO & IPOD section instead. If the person in charge of writing this had any sort of advanced engineering knowledge I'd have guessed that he would also look through and correct any other mistakes rather than getting other people to point it out for them, but this wasn't my expectation to begin with.
And he wouldn't have mistaken this for the output stage of a sound card:
When it is just a bunch of capacitors and resistors... for the midi port.
They got the other two correct though, but 67% accuracy doesn't spell good for a professional.
I wish I'd taken a screenshot of the original content to see how this unravels.
The impedance mismatch part stayed and is used on the PC AUDIO & IPOD section instead. If the person in charge of writing this had any sort of advanced engineering knowledge I'd have guessed that he would also look through and correct any other mistakes rather than getting other people to point it out for them, but this wasn't my expectation to begin with.
And he wouldn't have mistaken this for the output stage of a sound card:
An externally hosted image should be here but it was not working when we last tested it.
When it is just a bunch of capacitors and resistors... for the midi port.
They got the other two correct though, but 67% accuracy doesn't spell good for a professional.
I wish I'd taken a screenshot of the original content to see how this unravels.
wwenze said:I wish I'd taken a screenshot of the original content to see how this unravels.
Try Google's cache and see if it's still available.
se
Yup. It's still there. Capture it while you can.
Just type "cache:http://www.bursonaudio.com/burson_buffer_160.htm" into Google search.
se
Just type "cache:http://www.bursonaudio.com/burson_buffer_160.htm" into Google search.
se
Re: burson credability
I do not want to quote too much.
They go separate after end 2007 at the end of xxxxx. So right after that, the business at audio-gd mushroom with more products offsprings. Please check their website to see.
awpagan said:burson credibility
http://www.diyaudio.com/forums/showthread.php?s=&threadid=79185&highlight=
I still think these people make them, and Burson re-label them.
http://www.audio-gd.com/En audio-gd.htm
I do not want to quote too much.
They go separate after end 2007 at the end of xxxxx. So right after that, the business at audio-gd mushroom with more products offsprings. Please check their website to see.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
- Home
- Source & Line
- Digital Source
- "A standard CD player outputs signal at 24V"