Carver Professional pt1250 User manual
pt1250/pt1800/pt2400
Professional Stereo Power Amplifier
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK
DO NOT REMOVE COVER (OR BACK)
NO USER-SERVICEABLE PARTS INSIDE
REFER SERVICING TO QUALIFIED SERVICE PERSONNEL
The lightning flash with arrowhead
symbol within an equilateral triangle
is intended to alert the user to the
presence of uninsulated "dangerous
voltage" within the product's
enclosure that may be of sufficient
magnitude to constitute a risk of
electric shock to persons.
The exclamation point within an
equilateral triangle is intended to alert
the user of the presence of important
operating and maintenance (servicing)
instructions in the literature
accompanying the appliance.
Introduction ..........................................................1
Unpacking and Paperwork ...................................1
Features and Specifications
pt1250...............................................................2
pt1800...............................................................4
pt2400...............................................................6
Controls and Functions
pt1250...............................................................8
pt1800/2400....................................................10
Installation pt1250
Location and
General Precautions........................................12
Mechanical Considerations ............................12
Rear Support for
Road Applications ..........................................12
Thermal Considerations..................................12
AC Power Considerations ..............................12
Magnetic Leakage
Considerations................................................12
Input Wiring....................................................12
Output
Introduction
Congratulations on your purchase of a new Carver Professional Power Amplifier. It is backed by
state-of-the-art engineering and manufacturing techniques to bring you the best in quality
craftsmanship and reliable performance. The pt1250, pt1800 and, pt2400 are specially designed for
pro touring applications. Their rugged construction and low profile make it ideal for sustaining the
abuses of the road with reliability and space-saving economy. The pt1250 is rated at 625 watts per
channel into 4 ohms and 465 watts per channel into 8 ohms. The pt1800 is rated at 900 watts per channel
into 4 ohms and 600 watts per channel into 8 ohms. The pt2400 is rated at 1200 watts per channel into 4
ohms and 750 watts per channel into 8 ohms. The sophisticated protection circuits designed into this
amplifier will protect your system should an unexpected fault occur. They also protect the amplifier from
excessive temperature, continuous current limiting and shorted outputs. The balanced input uses a high
quality, high common-mode rejection differential amplifier for exceptional hum and noise rejection. The
sequencing feature on the pt1800 and pt2400 allows a rack of amplifiers to be powered up from a remote
location. The daisy-chain connection scheme causes each amplifier to turn on in sequence, preventing the
large in-rush current that can occur when an entire rack of amplifiers is turned on simultaneously. This power
amplifier was designed and manufactured by people with a lifetime commitment to providing the world’s
finest components for music and sound reproduction. Thanks for placing your confidence in Carver
Professional. We know your amplifier will provide many years of dependable service and reliable sound
reproduction. Unpacking and
Paperwork
Carefully unpack the amplifier and keep the original carton and packing materials for future moving, shipment
or long-term storage. After opening the box, please check for any visible signs of damage that were not
apparent from the outside of the box. If you do encounter what appears to be concealed damage, please consult
your Carver Professional Dealer before installing the unit.
Important Paperwork
Make sure to save your sales receipt. Your receipt is extremely important to establish the duration of your
Limited Warranty, and for insurance purposes. Next, make a note of the serial number which is located on
the back of the amplifier. Record it in the space provided below for convenient reference.
Model:________ pt1250 ________ pt1800 ________ pt2400
Serial Number:___________________
Purchased at:_____________________
Date:___________________________
Finally, take a moment to fill out and return the Warranty Registration Card packed with the amplifier and return
it to Carver Professional. This will allow us to keep you informed about new products as they become available.
1
•features
pt1250
2
●465W per channel into 8 ohms
625W per channel into 4 ohms
●XLR and 1/4” TRS input connectors
●Accepts balanced or unbalanced lines
●Heavy-duty 5-way speaker binding posts
●Independent CH 1 and CH 2 Level Controls with
11 detented positions
●Internally configurable for Parallel Mono mode for
single channel low impedance operation
●Highly efficient Pulse Width Modulated (PWM)
power supply
●High-efficiency linear tracking output design
●Dual-stage slow power-up
●High power to weight ratio
(1250 watts/11 pounds)
●Independent CH 1/CH 2 protection circuits will
instantaneously activate if one of the
following fault conditions is detected:
Excessive High Frequency
Over Temperature
Short Circuit
D.C. Offset
●Additional protection circuitry includes:
Clipping Eliminator
AC Line Fuse
●Power Connected/Standby indicator
●7 LED display per channel, including Power
Ready and Clip/Protect indicators
●2-speed switchable Fan cooled
●70-volt stereo direct drive operation
•features
3
Continuous Average Output Power, both
channels driven:
465 watts per channel
into 8 ohms from 20Hz to
20kHz, with no more than
0.5% THD; 625 watts per
channel into 4 ohms from
20Hz to 20kHz, with no
more than 0.5% THD
Parallel-mono operation:
100 watts into 4 ohms
from 20Hz to 20kHz, with
no more than 0.5% THD
70-volt stereo: 600 watts
per channel
70-volt parallel mono:
750 watts
Frequency Response:
20Hz to 20kHz
(±0, -0.5 dB)
Damping Factor: >200
Input Impedance: 15 kilohms unbalanced,
each leg to ground 30
kilohms balanced
Sensitivity: 1.5 Vrms for rated power
into 4 ohms
Gain: 32 dB (± 0.5 dB)
Input Overload: +15 dBu
THD: <0.5%
IM Distortion: <0.1%
Signal-to-Noise Ratio:
>105dB, weighted, ref. to
rated power into 4 ohms
Slew Rate: 25V/µS
CMRR: >70dB @ 1kHz
Power Consumption:
1200W full power
Power Requirements:
120V AC/60Hz (USA and
Canada) Other voltages
as required for export
Fusing: 10 amp slo-blo
(120V/60Hz)5amp
slo-blo (230V/50Hz)
Display: 7 LED indicators per
channel 1 green READY,
5 yellow SIGNAL, 1 red
CLIP/PROTECT
Size (H x W x D): 3.50” (2U) x 19” x 10.25”
89mm x 483mm x 273mm
Net Weight: 11 lbs. (5.0kgs)
Shipping Weight: 15lbs. (6.8kgs)
Due to ongoing research and development, all
specifications and features effective 4/96 are
subject to change without notice.
•
Power Output:
Both channels: driven (20Hz-20kHz)
8 ohm/ch. 600 watts
4 ohm/ch. 900 watts
2 ohm/ch. 1100 watt
Power Output: Series mono operation
(20Hz-20kHz)
8 ohm 1800 watts
4 ohm 2200 watts
Signal to Noise Ratio:
>100dB
(from rated power
@ 4Ω/A weighted)
Frequency Response:
20Hz to 20kHz
±0.5dB
Channel Seperation: >55db @ 1kHz
Slew Rate: 25V/µs
THD: 4Ω20-20kHz
(at 900W) < 0.5%
IM Distortion: <0.1%
Damping Factor: >200 @ 1kHz
Sensitivity: 1.5 V rms
Gain: 32dB
Input Impedance: 15 Kilohms
Unbalanced
30 Kilohms
Balanced
CMRR: >70db @ 1kHz
Maximum Current Draw:
30 A (4Ω
rated power)
Display: 7 LED indicators per
channel, 1 green on,
5 yellow signal, 1 red
clip/protect
Cooling: Rear to front w/100
CFM maximum
Connections-
Input: XLR, barrier strip
Output: 5 way binding posts,
2 sets/channel
Size (HxWxD): 5.25” (3u) x 19” x
12.75” (133mm x
483mm x 324mm)
Net Weight: 46lbs. (20.9 Kgs.)
Shipping Wt.: 55lbs. (25 Kgs.)
Due to ongoing research and development, all
specifications and features effective 4/96 are
subject to change without notice.
5
•
Power Output:
Both channels driven (20Hz-20kHz)
8 ohm/ch. 750 watts
4 ohm/ch. 1200 watts
2 ohm/ch. 1500 watts
Power Output: Series mono operation
(20Hz-20kHz)
8 ohm 2400 watts
4 ohm 3000 watts
Signal to Noise Ratio:
>100dB
(from rated power
@ 4Ω/A weighted)
Frequency Response:
20Hz to 20kHz
±0.5dB
Channel Seperation: >55db @ 1kHz
Slew Rate: 25V/µs
THD: 4Ω20-20kHz (at
1200W) < 0.5%
IM Distortion: <0.1%
Damping Factor: >200 @ 1kHz
Sensitivity: 1.5 V rms
Gain: 34dB
Input Impedance: 15 Kilohms
Unbalanced
30 Kilohms
Balanced
CMRR: >70db @ 1kHz
Maximum Current Draw:
40 A (4Ω
rated power)
Display: 7 LED indicators per
channel, 1 green on,
5 yellow signal, 1 red
clip/protect
Cooling: Rear to front w/100
CFM maximum
Connections-
Input: XLR, barrier strip
Output: 5-way binding posts,
2 sets/channel
Size (HxWxD): 5.25” (3u) x 19” x
12.75” (133mm x
483mm x 324mm)
Net Weight: 48 lbs. (21.8 Kgs.)
Shipping Weight: 59 lbs. (26.8 Kgs.)
Due to ongoing research and development, all
specifications and features effective 4/96 are
subject to change without notice.
7
8
2
135
4
Controls And Functions
1. CLIPPING ELIMINATOR
Pressing this switch turns on the clipping eliminator circuit. In this mode, the amplifier output remains
undistorted even when overdriven by 8dB.
2. LEFT/RIGHT VOLUME CONTROLS
10-step attenuators that adjust the relative output level of the pt1250. The amount of attenuation corresponds
to the front-panel marking, in dB. In parallel mono-mode, only the LEFT level control is active.
3. POWER SWITCH
This turns the amplifier on.
4. POWER LED
Ared LED that illuminates when the amplifier is on.
5. CH1/CH2 STATUS INDICATORS
These LEDs display information about the operation of the amplifier.
READY –These LEDs illuminate green when the power is on and the amplifier is ready to operate. The
READY LEDs illuminate red when the power switch is first turned on (while the power supply is stabilizing
prior to the speaker output relays switching in), or when the amplifier is in protect mode.
SIGNAL –These LEDs illuminate yellow when a signal is present at the Speaker Output jacks to provide an
indication of output power relative to full power (0dB).
CLIP/PROTECT –These LEDs illuminate red when the power switch is first turned on, when the output
begins to clip, or whenever there is a fault condition detected that causes the output relay(s) to disengage.
These fault conditions include excessive DC Offset, excessive heatsink temperature and short circuits at the
speaker output(s).
Note: The relays operate independently for each channel. Therefore, it is possible for one channel to operate
normally while the other is in “protect” mode.
pt1250
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2
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