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1100MkII
Class A Tube Mic Pre
Now with 192kHz
sampling and even lower noise!
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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 To Use This 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 |
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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. |
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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. |
| Digital |
| 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.
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SPECIFICATIONS
- Aphex Model 1100MkII - Class A Tube Mic Preamp
New Features In Red!
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| Analog Audio |
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| 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 |
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| 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 |
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| 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) |
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| 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 |
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| 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) |
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