Knoll MX1255 Handleiding
Lees hieronder de đź“– handleiding in het Nederlandse voor Knoll MX1255 (4 pagina's) in de categorie Receiver. Deze handleiding was nuttig voor 27 personen en werd door 2 gebruikers gemiddeld met 4.5 sterren beoordeeld
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Warranty
Knoll Systems warrants MX1255 amplifiers sold in the USA and Canada by
authorized Knoll dealers to be free of defects in materials and manufacturing.
This warranty extends for three full years from the date of purchase by the
original consumer. Any products returned to Knoll Systems and found to be
defective by Knoll Systems within the warranty period will be repaired or
replaced at Knoll Systems decision, at no charge. Knoll Systems will not be
responsible for the actual cost of installation or removal of the product, nor for
any incidental or consequential damages. Some states do not allow the exclusion
or limitation of incidental or consequential damages, so the above limitation may
not apply to you. This warranty gives you specific legal rights. You may have
additional legal rights that vary from state to state.
Specifications:
Inputs
12 Gold RCA jacks with adjustable gain
Input impedance
50k Ω
Outputs
detachable plug
Output power
55 watts RMS per channel (8 Ω)
Bridged Power (channel 6)
180 watts RMS (8 Ω only)
Peak output power
100 watts per channel (8 Ω)
Ideal impedance
4 - 8 Ω
Frequency response
10 Hz - 40 kHz +/- 1dB (1w)
S/N rat io
over 105 dB A weighted (50 watts)
THD distortion
less than 0.1% 20 Hz to 20 kHz
IMD distortion
less than 0.01% 60 Hz 7 kHz 4:1
(SMPTE)
Trigger control
12 VDC 35mA on 3.5mm mono jack
Dimensions
17" x 3.5" x 11.5" (432 x 89 x 292mm)
Fan Noise
quiet 26 dBA
Power
800 watts at 117 VAC or 230 VAC
Weight
21 lbs (9.5 kg)
Note: Specifications subject to change without notice.
Knoll Systems
145 Tyee Drive Point Roberts, WA 98281
14-7163 Vantage Way, Delta BC V4G 1N1
Tel: (604) 940 1689, fax (855) 734 3363
Made in Canada/Fabrique au Canada
MX1255 Amplifier
12 Channel Amplifier
Installation Instructions v7.5
Warning: To be installed and/or used in accordance
with appropriate electrical codes and regulations.
Description: The MX1255 is a member of the long line
of Knoll multi-channel amplifiers. Designed primarily for
the custom install industry, it is used to power speakers with different
or similar sources in multiple rooms. With 12 channels rated at 55 watts
per channels at 8 Ω, the MX1255 packs some serious punch. Each
channel has a gain control. The MX1255 can be turned on and off via
the front panel power switch or via the 12 VDC trigger. MX1255
channels 2-6 can be linked to channel 1 individually using the link
switches. MX1255 amplifiers designed to meet the amplifier needs of
custom installed systems where high-quality sound is a specific
requirement.
Key Features:
1. Size efficiency. The MX1255 consists of a total of 12 power
amplifiers in one 3-1/2” high enclosure. Each power amplifier
channel can deliver 55 watts RMS into an 8-Ω load.
2. Automatic protection circuitry. Each MX1255 channel is
individually and fully protected against low impedance,
overheating, overloading, over voltage and under voltage. The
protection circuitry automatically restores the amplifier channel
as soon as its parameter returns to the safe operating area.
3. Individual input gain adjustment. Each channel features
an input gain adjustment pot to adjust each channel for gain
and speaker sensitivity variations.
4. External power on/off. The MX1255 can be turned off and
on by external controllers via its 12 VDC trigger jack.
5. Stackable 17" chassis. 19” rack ears available.
6. Link Feature. Certain installations require that some or all of
the stereo channels play the same content. Instead of using Y
cords, the Knoll "link" cascades any or all of channels 2-6 to
channel 1 (L/R).
7. Bridgeable. Channel 6 can be bridged giving 180 watts RMS
into an 8 Ω load for use with subwoofers and speakers that need
more power.
Important Safety Instructions:
1) Read these instructions.
2) Keep these instructions.
3) Read all warnings.
4) Follow all instructions.
5) Do not use this apparatus near water.
6) Clean only with dry cloth.
7) Do not block any ventilation openings. Install in accordance with the manufacturer’s
instructions.
8) Do not install near any heat sources such as radiators, heat registers, stoves, or
other apparatus (including ampliers) that produce heat.
9) Do not defeat the safety purpose of the polarized or grounding-type plug. A
polarized plug has two blades with one wider than the other. A grounding type plug has
two blades and a third grounding prong. The wide blade or the third prongs are
provided for your safety. If the provided plug does not t into your outlet, consult an
electrician for replacement of the obsolete outlet.
10) Protect the power cord from being walked on or pinched particularly at plugs,
convenience receptacles, and the point where they exit from the apparatus.
11) Only use attachments/accessories specied by the manufacturer.
12) Use only with the cart, stand, tripod, bracket, or table specied by the
manufacturer, or sold with the apparatus. When a cart is used, exercise caution when
moving the cart/apparatus combination to avoid injury from tip-over.
13) Unplug this apparatus during lightning storms or when not used for long periods of
time.
14) Refer all servicing to qualied service personnel. Servicing is required when the
apparatus has been damaged in any way, such as power-supply cord or plug is
damaged, liquid has been spilled or objects have fallen into the apparatus, the
apparatus has been exposed to rain or moisture, does not operate normally, or has
been dropped.
15).Under no circumstances should the output terminals of the amplier be short-
circuited.
16).Be sure that the loudspeakers connected can handle the output power of the
amplier at the loudspeakers rated impedance. The warranty on the amplier does not
cover damage to loudspeakers that have inadequate power handling capabilities.
17) Where an all-pole MAINS SWITCH is used as the disconnect device, the location
on the apparatus and the function of the switch shall be described, and the switch shall
remain readily operable.
18) A push button is used to turn the power o and on.
19) A LED is used to show when the apparatus is powered on.
CAUTION: These servicing instructions are for use by qualied service personnel only.
To reduce the risk of electric shock do not perform any servicing other than that
contained in the operating instructions unless you are qualied to do so.
WARNING: This product may contain chemicals, including lead, known to
the State of California to cause birth defects or other reproductive harm.
Wash hands after handling.
Hum and noise
In most cases, one of the following suggestions should help you
solve a hum noise in your system. Please try these steps in the
order shown; proceeding from one step to the next if the prior
suggestion does not eliminate the problem.
Suggestion #1
To determine if a cable TV connection is responsible for the hum, first
turn off all the components. Disconnect the cable TV feed to your
system at the first place where it connects to your components.
Alternatively, disconnect the cable TV wire where it is connected at the
wall outlet. Turn your system back on, and listen if the hum has
disappeared. If removing the cable TV feed has eliminated the hum,
you will need to insert a Ground Loop Isolator (Knoll model GB634)
before reconnecting the cable TV feed, or contact your cable TV
operator to see if they can better isolate your cable feed.
Suggestion #2
Turn off all components in your system and then disconnect the input
cables at the amplifier. Turn the amplifier back on to see if the hum is
still present. If the hum disappears, the fault may be in the input cables
used. Try replacing them with cables that have better shielding, and
make certain that the input cables are not running on top of any AC
power cords. Change the cables one at a time to determine if one or all
cables are responsive. If the hum disappears when the input cables are
disconnected but returns after the cables are changed and the system
reconnected, your source device may be causing the problem.
Suggestion #3
Poor grounding of the electrical system in your home may also cause
ground loop problems, particularly when there are multiple components
with three prongs, grounded, power cords. Unplug these components
one at a time, and see if one or all of them is causing the problem. The
ultimate solution to this type of problem is to rewire your house with an
isolated, star type-grounding configuration. Knoll understands that this
may be impractical and expensive. In some instances, the use of an
approved AC power isolation transformer of sufficient capacity may
solve this problem.
Warning: If you suspect that the grounding system in your
home’s electrical wiring is causing the hum problem, it is
important that you do not make any changes to the wiring.
Only a licensed electrician should make any changes to
household wiring and they must be made in full compliance
with all local building, safety and electrical codes.
Knoll Systems service information
The MX1255 amplifier does not contain any user serviceable parts
inside. If you suspect a problem that may require servicing, contact us
at , or by phone at -940-1689 www.knollsystems.com/contact.html 604 .
Troubleshooting
If a problem is encountered with the MX1255, the most expedient
procedure is to locate the problem and if possible repair it before
requesting service. Be sure to carefully check other system components
such as controllers, CD players, volume controls, wiring, speakers, etc.
that may be at fault.
Problem Action
Power LED does 1. Check that the MX1255 is plugged in.
not light - no sound 2. Test the AC outlet with a lamp.
3. If remote on/off is used, check that
the trigger voltage is at 12 VDC.
4. Check MX1255 power button on (in).
Sound cuts out 1. Verify speaker impedance is 4- 16 Ω.
Changing speakers may be required.
2. Check if the MX1255 feels hot. If it's
hot increase cooling - see . Installation
Sound is distorted 1. Turn the volume down.
2. Check speakers for damage.
3. Check inputs for proper levels.
MX1255 gain and source output level
may, have to be adjusted.
4. Speakers may be less than 4 Ω.
MX1255 does 1. Push MX1255 power switch off (out).
not turn off 2. If trigger is being used, power switch
needs to be set to off (out) position
or amp is on all the time.
3. Try disconnecting trigger jack.
Trigger does not 1. Measure the trigger voltage with a volt
work meter. It needs to be 11-15 volts DC
to work (current is about 35mA total
per amp). See page 5 for details.
Speaker pops when 1. Speaker may need resistor placed
amp turned on or off across terminal. Suggest 2k0 1/4 w.
Discharges speaker internal capacitor.
Installation
Installing the MX1255 should be relatively easy. With a bit of
planning, it will give trouble free service for years.
1. The most important consideration when installing the
MX1255 is cooling. The MX1255 has a lot of power packed into a
small chassis size. When installing it in an equipment stack, it
should be the top component. It needs at least 3"-5" of space
above the amplifier to allow for adequate convection cooling.
2. Amplifiers should always be the top components in the system.
3. If MX1255 channels frequently shutdown due to overheating,
install a fan directed up from the MX1255 bottom center.
4. Never operate the MX1255 on its side, as the cooling potential
drops significantly when operated this way.
5. Connect the MX1255 inputs to the source component outputs
with good quality, short as possible RCA jack cables. Connect each
channel individually.
6. Connect the MX1255 speaker outputs to speakers using good
quality speaker wire. Minimum 16 gauge copper wire is
recommended with 14 gauge minimum for runs over 30' (10m).
Note: Ideally the MX1255 likes 6- loads. Connecting 8 Ω
to 4 Ω loads won't hurt the MX1255 but those channels
connected to 4 Ω loads may occasionally shutdown due
to overloading. Never connect to speaker loads less than
4 Ω. Channel 6 bridged mode minimum 8 Ω speaker.
7. Individually adjust the channel gains as required. Ideally, all
gains are fully on (fully clockwise).
8. Make sure the speakers in each room are connected in phase
with the amplifier + going to the speaker +. Out of phase speakers
give unstable imaging and poor bass response.
9. Connect trigger if being used to a 12 VDC source (about 35mA)
using a 3.5mm mono jack. 5 VDC triggers will not work.
10. Connect the AC power into an outlet that supplies at least 8
amps 120 VAC or 4 amps 230 VAC (1000 watts) dedicated to each
MX1255.
11. If more power is needed, channel 6 can be mono bridged to
give 180 watts into an 8 Ω load. Minimum impedance for
channel 6 in the bridged mode is 8 Ω. The bridged switch needs
to be in the out position. The bridged input is 6L and the 6L gain pot
adjusts the bridged gain. The speaker is connected to the 6L+ and
6R+ in the bridged mode.
Product specificaties
| Merk: | Knoll |
| Categorie: | Receiver |
| Model: | MX1255 |
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