Couple of days ago son* sent me from France two recordings of guitar. One performance, two microphones.
The one attached (original was 16bit .wav) was made with a BM-800 LDC (sic) the REALLY cheap jobby. But useful since it can be jacked straight into a laptop or, run on an XLR cable as is the case here into a Berry UMC204HD interface (I had it for 2 weeks, very quiet)
I am sure you folks can hear the hum click in at the start and then can be heard at the last gasp the clicks off? I have isolated the hum and attached a spectrum. some 50Hz and a bit more at 150Hz. That indicates inductive pickup of a transformer, if it were 'system' noise it would be at 100Hz.
Now, I have an identical microphone so I hooked it up to my KA6 and set gain such that "rains on plains" was hitting neg ten from 200mm. I then waved the mic over the mains traff side of our HT-20, all round a Tannoy monitor and close to a wall rat powering a USB HDD.
Not a peep of mains intruded! So, either son is living inside a MuHASSIVE hum field or his mic is in some way faulty, would not be at all surprised, QC on the BM/Sky mics is abysmal. I cannot see the former situation being the case otherwise electric guitar would be impossible! Naturally dad has sent him all this data but no reply as yet...KIDS eh?
*He apologizes for the poor playing. The exercise was for mic testing and he has only just begun to learn that Goldberg variation.
Dave.
The one attached (original was 16bit .wav) was made with a BM-800 LDC (sic) the REALLY cheap jobby. But useful since it can be jacked straight into a laptop or, run on an XLR cable as is the case here into a Berry UMC204HD interface (I had it for 2 weeks, very quiet)
I am sure you folks can hear the hum click in at the start and then can be heard at the last gasp the clicks off? I have isolated the hum and attached a spectrum. some 50Hz and a bit more at 150Hz. That indicates inductive pickup of a transformer, if it were 'system' noise it would be at 100Hz.
Now, I have an identical microphone so I hooked it up to my KA6 and set gain such that "rains on plains" was hitting neg ten from 200mm. I then waved the mic over the mains traff side of our HT-20, all round a Tannoy monitor and close to a wall rat powering a USB HDD.
Not a peep of mains intruded! So, either son is living inside a MuHASSIVE hum field or his mic is in some way faulty, would not be at all surprised, QC on the BM/Sky mics is abysmal. I cannot see the former situation being the case otherwise electric guitar would be impossible! Naturally dad has sent him all this data but no reply as yet...KIDS eh?
*He apologizes for the poor playing. The exercise was for mic testing and he has only just begun to learn that Goldberg variation.
Dave.