Jeg har et eldre NAD 214 effekttrinn som jeg tenkte jeg skulle brokoble for å drive en passiv sub. Problemet mitt er at jeg har rotet bort manualen, og lurer derfor på om noen kan hjelpe meg med en liten "howto".
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Tråd: Brokoble NAD 214
08-17-2008, 20:20 #1
Brokoble NAD 214
08-17-2008, 20:31 #2
Hentet fra manualen til 218THX:
7. BRIDGING ON (Mono) / OFF (Stereo).
This switch “bridges” the two channels together,
forming a monophonic amplifier with more than double
the output power. To convert to bridged operation,
the following procedure should be followed.
(1) Switch OFF the POWER.
NOTE: in the bridged mode the loudspeaker’s
impedance is effectively halved as “seen” by the
amplifier. An 8-ohm load looks like 4 ohms, a 4-ohm
load looks like 2 ohms, and a pair of 4-ohm speakers
operated in parallel will resemble a 1-ohm load.
Driving paralleled low-impedance speakers to high
levels will cause the amplifier to overheat and shut
down, or may cause internal fuses to blow in order to
protect the amplifier. In bridged mode you must connect
only ONE loudspeaker whose nominal impedance
is 8 or higher.
BI-WIRED LOUDSPEAKERS:If you have a loudspeaker
which may be bi-wired and you wish to use
this option in bridged mode, the nominal impedance
of the loudspeaker (when connected conventionally)
must be 8 or higher.
(2) Disconnect any signal cables from the input
jacks. Decide whether this amplifier will be driving
the Left or Right speaker. Connect the corresponding
(left or right) signal cable from your preamplifier to
one of the L input jacks of this amplifier
NOTE: In the bridged mode the amplifier is driven
only through its L (Left) input, even though it may be
connected to the Right speaker. If another NAD 218
THX amplifier in bridged mode is used for the second
stereophonic channel, it also will be driven through its
L input, regardless of whether it is used to drive the
Left or Right loudspeaker.
(3) Disconnect any wires from the SPEAKERS
terminals. Select the wire from the speaker that will
be driven by this bridged amplifier. Connect its “positive”
conductor to the L+ terminal and its “negative”
conductor to the R+ terminal (i.e. the two red terminals).
DO NOT connect any wires to the black terminals
(L- and R-).
CAUTION: In the bridged mode the speaker wires
must be “floating” with respect to the circuit ground.
Do NOT connect the speaker wires to anything that
shares a common ground between stereo channels
(such as a speaker switch or an adapter for electrostatic
headphones), nor to anything which shares a
common ground with the amplifier’s inputs (such as a
switching comparator or a distortion analyzer).
(4) After the preceding conditions have been satisfied,
move the Bridging switch to ON (MONO).
Finally turn the Power ON.
(6) To return the amplifier to normal stereo operation
at a later date, first turn off the power. Re-set the
Bridging switch to OFF (STEREO). Restore normal
Left and Right input connections, and re-connect
loudspeaker wires to the speaker terminals as
described above under SPEAKERS.
08-17-2008, 20:37 #3