Hello Microtrack-Friends,
I am trying to get one of these devices and want to measure all the properties of the device.
One thing that is strange is the voltage of the phantom power.
Basically there are three different feeding circuits defined in the standard:
48V, using 6,8kOhm feeding resistors
24V, unsing 1,2kOhm feeding resistors
12V, using 680 Ohm resistors.
Did anyone of you measure the voltage of the Microtrack with/without a microphone connected ?
Because of the feeding resistors there will be a voltage drop at the terminals as soon as a microphone is connected and a current is drawn.
The fact is that using a lower voltage will result in a loss of quality, e.g. the sensitivity and maximum SPL of the microphone will be worse than stated in the datasheet. Some microphones might be more noisy or have crackling noise, depending on the circuit design of the microphone.
Some microphones are designed to accept 12/24/48 V, some only accept 48V.
Another issue I am interested in but could not find a specification: what is the maximum uninterrupted recording length ?
Is there a limitation in duration, file size or is the size of the CF card the only limitation ?
Does anyone out there have experiences with recordings during connected power supply ? Does it work properly or is the noise floor affected by the power supply ?
Don´t get me wrong, I think the Microtrack is a really great device. This beats Edirol R-1 by far !
Especially the dual microphone Inputs (plug in power and phantom power) make it a versatile device.
Best regards from Germany
Martinusb