Sam Adams it is - the cherry flavoured one. We can get it here in Australia!
Just book your flights and I'll chuck a prawn on the BBQ
Just book your flights and I'll chuck a prawn on the BBQ
cd player - xlr output buzzing
currently using the xlr output of this cd player;
http://www.cattylink.com/page153.html
to the RCA input of this preamp;
http://www.cattylink.com/page309a.html
I am using a generic female xlr -> male rca cable. Each time I start the system up, there is buzzing and harmonics in the speaker output at low volumes. It is okay at higher volumes. I tried to see if it is the tubes, or the output, but nothing alters the problem except using the RCA output of the cd player into the RCA input of the preamp.
The only reason I don't use the RCA output is that it runs directly to another amp/system and the RCA cable is far longer than the XLR->RCA cable.
Is there any possibility that the higher vrms of the xlr output is causing the buzzing? Would it be wiser to simply buy an xlr female to xlr male adapter and then use an RCA->RCA cable in conjunction with the adapter to see if the buzzing continues?
http://www.cattylink.com/page153.html
to the RCA input of this preamp;
http://www.cattylink.com/page309a.html
I am using a generic female xlr -> male rca cable. Each time I start the system up, there is buzzing and harmonics in the speaker output at low volumes. It is okay at higher volumes. I tried to see if it is the tubes, or the output, but nothing alters the problem except using the RCA output of the cd player into the RCA input of the preamp.
The only reason I don't use the RCA output is that it runs directly to another amp/system and the RCA cable is far longer than the XLR->RCA cable.
Is there any possibility that the higher vrms of the xlr output is causing the buzzing? Would it be wiser to simply buy an xlr female to xlr male adapter and then use an RCA->RCA cable in conjunction with the adapter to see if the buzzing continues?
- ...
- 18 posts total
I wonder if one of these XLR to RCAwould help You should be able to find less expensive models by other Mfgers if you Google around I also noticed that your CD player's output voltage on the XLRs is 4 Volts and that your preamps input voltage is only 215 MV ... could it be possible that you are picking up some of the noise floor from the CD player because of it's high output relative to the preamps very low input sensitivity ????????? |
Good suggestion by Dave about the Jensen transformers. A number of Audiogon members have reported using them, with no perceivable sonic side-effects. There is an excellent paper at Jensen's site about interfacing balanced and unbalanced equipment: http://www.jensen-transformers.com/an/an003.pdf Note that among the various approaches it describes, the adapter cable approach is shown for rca to xlr input, but NOT for xlr output to rca input. Although it certainly can be done sometimes, if the output impedance and drive capability of the output circuit permits, or if pin 3 is left open. Here is a lower priced alternative to the Jensen transformers: http://www.bhphotovideo.com/c/product/381596-REG/ART_DTI_DTI_Transformer_Isolator.html http://www.artproaudio.com/downloads/specsheet/dti.pdf I've used this device in non-critical voice recording applications, and in that application it has seemed perfectly transparent sonically. I'm inclined to think that the problem is not due to noise floor sensitivity, because it seems to be inversely related to volume control setting, it is intermittent, and it is not present on the rca output (where the output level is only 6db lower than on the xlr output). Good luck! -- Al |
Bleoberis and Almarg, I was in fact thinking that the **output** of the CD player is where this pin 3 to pin 1 thing might have to happen. I understand Almarg's concerns but I have yet to see any line level electronics that could be damaged by this (we do this to our stuff all the time). Something else you might look into is lifting the ground of the CDP's power cord. It might be as simple as a ground loop. |
- 18 posts total