|
 |
This superbly crafted new breed
of advanced tube microphone preamp reaches far beyond mere technical excellence
to deliver sound that is uniquely involving, compelling, and real. Our incredible
new 2 channel Model 1100 gives you up to 20 dB more headroom than conventional
preamps, allowing you to record hotter tracks with the highest possible
digital resolution. This unprecedented amount of headroom, combined with
an EIN of -135 dBu, allows you to take more gain without the pain of overload
distortion or noise.
|
| MORE GAIN - NO PAIN |
| To achieve this amazing performance,
we developed new proprietary circuitry: |
Discrete Class A Bipolar PNP Solid State Front End |
|
Second Stage Reflected Plate Amplifier™ Tube Circuit |
|
Sweepable Low Frequency Cancellation Filter (LoCaf™) |
|
MicLim™ Limiter on the microphone input itself makes the 1100 virtually
crashproof |
|
Drift Stabilized™ A/D Circuitry eliminates the need for high pass filtering
in the digital domain |
|
Third stage Reflected Plate Amplifier Tube Circuit Discrete Class A Impedance
Balanced Output Stage |
| Compare this to any other mic preamp
— you'll understand the benefits of 'More Gain with No Pain'. |
|
| MORE REASONS THIS IS A
GREAT PREAMP |
|
Front panel peak headroom meter and function controls |
|
Precision three-turn output level attenuator |
|
Full featured AES/EBU digital audio output |
|
Noiseless muting via rear panel Mute Jack |
|
Ramped 48-volt phantom power circuit |
|
Linear, internal low-noise power supply |
|
20dB pad and Phase Reverse are switched by bifurcated
gold-contact relays |
|
| THE PATH TO MORE GAIN |
|
MicLim™ CIRCUIT
A custom designed optical attenuator, located directly on the
mic input line, smoothly limits the microphone's output signal according
to the MicLim peak detector's control current. Since attenuation comes prior
to preamplification, the proprietary MicLim can increase the Model 1100's
effective headroom by typically 15 dB. MicLim detects the preamplifier's
output signal and instructs the input attenuator to proportionately reduce
the microphone's output level just enough to prevent clipping. MicLim has
no effect at all when the preamplifier's output level is not approaching
clipping. NOW WITH A NEW IMPEDANCE SELECTOR for
use with microphones with low output (source) impedance.
Tunable, low-cut servo filter — LoCaf™
This unusual design meshes a tunable second order (12 dB/octave)
low-cut filter into the nodal intersections of the first and second amplifying
stages in a so-called "servo" configuration. This servo affects
only the frequencies below the low-cut corner frequency, contributing nothing
to the audible signal. Imposing the servo filter in such a manner gives
the preamp about 20 dB more overload headroom in the low-cut range compared
to conventional techniques. Additionally, the added subsonic headroom afforded
by the low-cut servo filter eliminates the need for MicLim to respond to
subsonic signals, eliminating the undesirable effect of limiting the input
signal in response to excessive subsonic energy. The low-cut shape follows
a Butterworth response slightly modified to improve the transitional phase.
Tube, discrete Class-A differential second stage
The unique, Aphex patented "Reflected Plate Amplifier"
tube circuit is configured as a single-triode differential opamp to further
enhance the preamplifier's common-mode rejection. This novel circuit topology
subtly imparts the tube's sonic warmth and character while retaining a long
and stable operating life.
Ultra low noise, transformerless, discrete Class-A, bipolar
PNP, variable gain, differential input stage
No outer feedback is used, eliminating the possibility of
any dynamic interaction with the microphone's self-impedance. The input
impedance remains passive, providing an optimal load for any microphone.
The solid state, Class-A PNP bipolar design achieves high common-mode rejection
with extremely low noise, wide bandwidth, and low distortion at all gain
settings. Robust input overload protection assures that all performance
features will be ratained indefinitely. The gain is adjustable in 4dB precision
steps from 21 to 65 dB.
Series-Shunt, optical soft-mute attenuator
The second-stage output signal passes through a specialized
series-shunt optocoupler circuit to provide a soft mute without adding distortion
or noise.
Tube, discrete Class-A output stage
An Aphex petented "Reflected Plate Amplifier" tube
circuit is configured as a low distortion triode buffer having a very low
output impedance and high output current drive. The maximum output level
of +27 dBu into 600 ohms meets the needs of any professional application.
Matched-impedance balancing assures top performance whether driving balanced
or unbalanced lines. A rear panel switch is assigned to insert a 12 dB low
impedance pad into the output line for systems based on IHF (semi-pro) operating
levels. Rear panel XLR 3-pin and 1/4 inch phone jacks are both provided
for balanced output.
|
|
| ABOUT THE DIGITAL SECTION |
|
The A/D converter receives signal from the soft mute stage just prior to
the analog output level control and triode output stage. This means you
can use BOTH the digital and analog outputs independently, with full and
proper calibration of both regardless of the analog output level settings.
The analog and digital outputs respond equally to the input gain, low-cut
filter, and all front end conditioning effects.
|
|
| METERING |
Each channel contains a 20-segment LED headroom meter, making it easy to
optimize the performance of the preamplifier. The headroom meter is calibrated
in decibels below clipping, where 0 dB is the analog clipping point. This
coincides with the A/D converter's maximum input level, so the headroom
meter also indicates the digital audio level accurately. Each channel contains
its own independent controls over every function.
|
|
| SPECIFICATIONS - Aphex
Model 1100MkII - Class A Tube Mic Preamp NEW
FEATURES ! |
| ANALOG
AUDIO |
|
| |
EIN |
Gain = 65dB, input shorted,
BW = 100Hz to 22kHz, EIN = -135dBu |
| |
Mute Function |
Optical soft switch,
greater than 70 dB of attenuation |
| |
Low Cut Filter frequencies |
Off, 30, 36, 44, 53,
63, 77, 92, 111, 134, 162, 195 Hz |
| |
Low Cut Filter Type |
Second order Butterworth
servo cancellaton technique - LoCaf™ |
| |
Phantom Voltage |
+48VDC (can withstand
a short curcuit to ground on both mic jacks indefinitely |
| |
Phantom build-out resistances |
6.81k ohms to pins 2
and 3 |
| |
Phantom ramp-Up/Down |
Slow ramp approx 5 seconds
- eliminates turn on/off "thumps" |
| |
Preamp Gain |
21 dB to 65 dB in 4
dB steps |
| |
Output match trim |
3-turn precision potentiometer
0 to -12dB range |
| |
Maximum Output Level
(MOL) |
+27 dBu unloaded; +25
dBu into 600 ohms |
| |
Maximum Input Level
(MIL) |
+27 dBu minus preamp
gain value plus pad value |
| |
THD |
Output level = +15 dBu,
0.09%; output level = +4dBu, 0.05% |
| |
IMD |
Output level = +15 dBu,
0.12%; output level = +4dBu, 0.08% |
| |
DIM |
Below noise floor at
all possible measurement levels |
| |
Slew Rate |
22V/usec |
| |
Analog Dynamic Range |
97 dB to 101 dB depending
upon preamp gain setting |
| |
Analog Output Noise |
-70 dBu to -74 dBu depending
upon preamp gain setting |
| |
Analog Signal / Noise
Ratio (SNR) |
76 dB typical for ref
level = +4dBu |
| DIGITAL
AUDIO |
|
| |
Output Resolution |
24 Bits |
| |
Output Sample Rate NEW |
44.1, 48, 88.2,
96, 196 kHz selectable |
| |
Clock
Source |
Internal low jitter
crystal, external word clock, or external AES/EBU clock
any outside source up to 192kHz |
| |
Digital SNR |
98 dB typical for ref
level = 0dB(fs) |
| |
Digital SNR |
80 dB typical for ref
level = -18dB(fs) |
| FRONT
PANEL CONTROLS |
|
| |
Preamp Gain (each channel) |
21, 25, 29, 33, 37,
41, 45, 49, 53, 57, 61, 65 dB, switched |
| |
Low Cut Frequency (each
channel) |
Off, 30, 36, 44, 53,
63, 77, 92, 111, 134, 162, 195 Hz switched |
| |
Line Output Calibration
(each channel) |
3-turn precision potentiometer
0 to -12 dB range |
| |
20 dB pad (each channel) |
on / off |
(switched
by bifurcated gold contact relays immune
to noise, distortion, and dry contact diode effects) |
|
| |
Polarity (each channel) |
positive / negative |
| |
Test Tone (each channel) |
on / off |
| |
Phantom (each channel) |
on / off |
| |
Mute (each channel) |
on / off |
| |
MicLim™ (each channel) |
on / off |
| |
Clock Source NEW |
Internal / External
- any source up to 192kHz |
| |
Internal Rate |
44.1 / 48 / 96 kHz |
| |
Power |
on / off |
| REAR
PANEL CONTROLS |
|
| |
Line Output Normal |
+4 dBu / -10dBv switch |
| |
Mute Jack |
Switchable via front
panel pushbutton, or by a remote switch plugged in |
| OTHER
SPECIFICATIONS |
| |
Power requirements NEW
|
Universal
Power Supply : 80 to 280 Volts 50-60 Hz 35
Watts |
| |
Dimensions |
19"W x 1.75"H
x 9" D 1 Rack U (482.6mm
x 44.5mm x 228.6mm) |
| |
Front Panel Projections |
.75" max
(19 mm) |
| |
Net Weight |
8.2 lbs (3.73
kg) |
| |
Shipping Weight |
10 lbs (4.5
kg) |
|
|
|
|
|
|
|
|
|
|
|
103k
103k
