JCF Audio Latte User Manual - page 7
The output impedance of this point is 47
Ω
in all unbalanced configurations. The output impedance is ~94
Ω
in bal-
anced configurations (47
Ω
per leg). These conditions are for both preamp and line amp outputs. The 4 transistor
line amplifier employed here has a great deal of drive and will have no problem sounding good into loads as low as
600
Ω
. The preamp output will not drive appreciable loads with any measure of sonic merit. The load when using
this port as a preamp output should not be below 5k
Ω
and preferably higher. Cable runs from this point should be
sensible as well.
BAL outputs
- These outputs are the transformer coupled main outputs of the DMT section of the unit. The output
impedance is ~75 ohms floating. The unit will start to sound (and measure) poorly with a load lower than 500
Ω
.
AES inputs
- These inputs are transformer coupled, 110 ohm balanced. The inputs will receive AES compatible
streams from a variety of sources. AES compatible inputs are single wire only.
Note: Since this input is transformer coupled and sensitive enough, use of a simple adapter or custom-wired cable
may be employed to connect this input to a “consumer” or “S/PDIF” output in most cases. This style connection will
usually not terminate the line correctly, so cable runs should be kept to a minimum to avoid interface related time-
base problems.
Opt. I/O
- These jacks (commonly known as TOSLINK) will work up to 192k. The Optical output will only transmit
data from the left channel in mono mode. APF cable length should not exceed 16ft.
AES outputs
- These outputs are transformer coupled 110 ohm sources. They will drive any reasonable amount of
110 ohm terminated AES cabling effectively. Operation at many hundreds or thousands of feet is not recommended.
These outputs can be operated in dual mono mode with the change of a jumper. (See jumper section)
Line Inputs
- These inputs are jumper configurable to utilize any combination of the following features
• Pin 1 lift
• Pin 2 or 3 hot
• Actively balanced or unbalanced operation (with or without dummy load on negative leg)
Dummy loading can assist
only with specific kinds of actively balanced
outputs feeding an unbalanced input to
prevent and the output devices amplifier from driving directly into ground. This may not be useful in all cases.
See below pictures and diagrams
for defaults and examples:
JCF Audio
J C F A u d i o
L a t t e
6