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jonsson
Member
574 Posts |
 Posted - 2007/01/04 : 13:34:36
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En kompis har just köpt sig ett Nad C270 som han ska brygga å driva en XLS12" låda med slav.. Han ringde häromdagen och fråga vad tus*n de två ingångarna betyder på baksidan!?
Tydligen står det på ena "Variable" och på den andra "Fixed".. det här var som jag förstod två st RCA-ingångar.. Nån som kan hjälpa oss lite med vad detta betyder??
Är det sedan nån som bara kan ge en snabb åsikt om lådan verkar lagom avstämd!?? ca 47Liter inv. och den "lätta" 12"-slaven + 200gram extravikt... Jag hade för mig att jag räknat på en sån låda nån gång men har inga program kvar... Innan jag visste ordet av hade kompisen byggt klart och fanerat en låda efter vi pratat lite om detta när han FUNDERADE på att köpa en sån bas.... Kommer delas vid ca 60Hz..Inte högre iaf...
Tack på förhand
Mvh Magnus Jonsson |
När jag blir klar!!!!!! hoppas jag det låter bra. |
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widen76
Member
221 Posts |
Posted - 2007/01/04 : 15:46:48
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Från C270 manualen (http://nadelectronics.com/product-manuals#Power_Amplifiers):
1. FIXED IN
The Fixed Inputs take the input signal straight to the power
amplifier’s circuitry. This set of inputs is normally used in a system
with only one power amplifier or multiple but identical power
amplifiers. Refer also to section “Variable In” in this chapter for
more information.
Connect the output from a pre-amplifier or processor, such as a
surround-sound decoder, to this set of inputs. Use a twin RCA-to-
RCA lead to connect to the left and right ‘Audio Output’ of the preamp
or processor to the Fixed-In sockets.
NOTES: Always turn the C270 and other components in the
system off before connecting or It is disconnecting anything to the
“Fixed In” or Variable In” sockets.
When using the Fixed In sockets, make sure the “Input Select”
switch (No.2) is to the “Fix” position.
2. INPUT SELECT
The Input Select switch determines which input on the C270 is
active. Set to “FIX” for use with “Fixed In” and to “VAR” for use
with “Variable In”. Refer also to section “Variable In” in this
chapter for more information.
3. VARIABLE IN
Using the Variable inputs, it is possible to adjust the volume level
for both channels simultaneously, using the Input Level Control
(No. 4). This can be useful for:
• Level matching
In a surround sound or system with more than one set of
speakers, differences in levels can occur due to variances in
efficiency between these speakers. In case your preamplifier or
processor also has individual trims for each channel, set these
to neutral or mid position (usually marked as 0dB). Adjust the
Level Control so that the speakers driven by the C270 have the
correct volume level compared to the other speakers, judging
from your listening position.
• Extended volume control range
Many systems have so much voltage gain that the speakers (or
your ears) are overdriven at any volume control setting higher
than 11 or 12 o’clock. As a result you are confined to using only
the lower half of the volume control’s range, where adjustments
are imprecise and where channel balance errors tend to be
greater. If the input level is reduced, you can turn up your
processor’s or preamplifier’s volume control, making more
effective use of its range. (Suggestion: adjust the input level
controls so that your preferred maximum sound levels usually
occur at about 2 or 3 o’clock on the volume control.) As an
added benefit, this procedure suppresses any noise produced
by the preamp’s high level circuitry (e.g. any residual hum or
hiss that does not go away when the Volume is turned down).
• Bi-Amping
Some loudspeakers have separate connection terminals for the
LF (Low Frequency) and HF (High Frequency) sections of the
speaker. This facility allows to “Bi-Amp” such speakers, where
a separate power amplifier is used for the LF and HF section,
which may improve overall sound quality. When Bi-Amping with
different models of power amplifiers, it is likely to occur that one
power amplifier has more “gain” than the other, resulting in a
mis-match in level for the woofer and tweeter of the speaker.
Adjust the level control so that woofer and tweeter are in perfect
balance with each other (identical gain of power amplifiers).
Connect the output from a pre-amplifier or processor, such as a
surround-sound decoder, to this set of inputs. Use a twin RCA-to-
RCA lead to connect to the left and right ‘Audio Output’ of the preamp
or processor to the Fixed-In sockets.
NOTES: Always turn the C270 and other components in the
system off before connecting or disconnecting anything to the
“Fixed In” or Variable In” sockets.
When using the “Variable In” sockets, make sure the “input
Select” switch (No.2) is to the “VAR” position.
4. INPUT LEVEL CONTROL
The Input Level control works in combination with “Variable In”
(No. 3) only. With the control the volume to the power amplifier
can be adjusted from zero (counter clock-wise) to maximum
(turned up all the way clock-wise). Refer also to section “Variable
In” in this chapter for more information.
NOTE: Always turn the C270 and other components in the system
off before connecting or disconnecting anything to the “Fixed In”
or Variable In” sockets. |
Min utrustning: CD-spelare: NAD C521, Förstärkare: Hegel H100 SE, DAC:Hegel HD11, Högtalare: B&W 603 S3, Sub: B&W ASW610. Högtalarkablar: Supra Ply 3.5, Signalkablar: Harmonic Tech Truth-Link, Harmonic Tech Harmony-Link |
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jonsson
Member
574 Posts |
Posted - 2007/01/04 : 15:58:23
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| Widen76: Tackar tackar för det:) |
När jag blir klar!!!!!! hoppas jag det låter bra. |
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widen76
Member
221 Posts |
Posted - 2007/01/04 : 23:11:59
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| Inga problem. Har själv en C270 som jag kör med Variable, för att sänka in-nivån så volymreglaget på preampen får dras upp lite och inte blir sådär känslig när man spelar på lägre volymnivåer (typ klockan nio på reglaget) |
Min utrustning: CD-spelare: NAD C521, Förstärkare: Hegel H100 SE, DAC:Hegel HD11, Högtalare: B&W 603 S3, Sub: B&W ASW610. Högtalarkablar: Supra Ply 3.5, Signalkablar: Harmonic Tech Truth-Link, Harmonic Tech Harmony-Link |
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