Crown K-Series Reference Manual
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Crown K-Series Reference Manual

K-series balanced current amplifier
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K K K K K -Series
-Series
-Series
-Series
-Series
© 1998 by Crown International, Inc., P.O. Box 1000,
Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000.
Fax: 219-294-8329. Trademark Notice: Balanced Current
™
™
Amplifier
, and BCA
are trademarks and Crown
registered trademark of Crown International, Inc. Other
trademarks are the property of their respective owners.
120 VAC North
American
®
Units Only:
Watch for these symbols:
Lightning Bolt Symbol:
This symbol is used to alert the
user to the presence of danger-
ous voltages and the possible
risk of electric shock.
Exclamation Mark Symbol:
This symbol is used to alert the
user to make special note of im-
portant operating or mainte-
nance instructions found in the
reference manual.
®
is a
Commercial
Audio
E106377
102010-2
2/98

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Summary of Contents for Crown K-Series

  • Page 1 K K K K K -Series -Series -Series -Series -Series © 1998 by Crown International, Inc., P.O. Box 1000, Elkhart, IN 46515-1000 U.S.A. Telephone: 219-294-8000. Fax: 219-294-8329. Trademark Notice: Balanced Current ™ ™ ® Amplifier , and BCA are trademarks and Crown is a registered trademark of Crown International, Inc.

  • Page 2: Friendly Page Of Tips And Warnings

    K-Series Balanced Current Amplifier™ Friendly Page of Tips and Warnings Page 2...
  • Page 3 K-Series Balanced Current Amplifier™ Protect the power cord attached to your K-Series am- plifier. Route it to avoid foot traffic or other situations where the cord might be stretched or pinched. Pay spe- cial attention to the cord connector and attachment points.

  • Page 4: Unpacking Your K-Series Amplifier

    K-Series Balanced Current Amplifier™ Unpacking Your K-Series Amp Please unpack and inspect your amplifier for any damage that may have occurred during transit. If damage is found, notify the transportation company immediately. Only you can initiate a claim for shipping damage. Crown will be happy to help as needed.

  • Page 5: Features

    K-Series Balanced Current Amplifier™ Page 5...

  • Page 6: Quick Start

    (Remember: save the best for last.) 7. Make sure the Channel 1 and Channel 2 level (volume) con- trols on your K-Series amplifier are turned all the way down (counter-clockwise), then flip the power switch “ON” (press upward). Note: After a two-second delay, the “Enable” light will glow a bright green to indicate power is on.

  • Page 7: Typical Stereo Hookup

    You may notice that your K-Series amplifier becomes warm to the touch after a few minutes of use. Don’t be alarmed. This is a normal operating condition for your K-Series ampli- fier. The K-Series of amplifiers are designed to be convection cooled, and therefore radiate heat passively to the enviroment.
  • Page 8 K-Series Balanced Current Amplifier™ Page 8...

  • Page 9: Table Of Contents

    K-Series Balanced Current Amplifier™ Contents Friendly Page of Tips and Warnings ...... 2 Unpacking Your K-Series Amplifier ......4 Features ..............5 Quick Start ............6 Welcome ............. 10 Very Detailed Install ..........14 Operation ............21 Other Issues ............26 Specifications .............

  • Page 10: Welcome

    Thank you for choosing Crown! Mick and his team of enthusi- astic engineers have worked long hours to craft a totally new kind of amplifier—the K-Series. These are the first amplifiers to incorporate Crown’s patented BCA™ (Balanced Current Am- plifier™) technology, and we are all very proud to have in- vented them.
  • Page 11 The K-Series amplifiers are also highly energy-efficient—some of the World’s first “green” amps. As a result, the K-Series amps use less electricity (reducing your utility bills) and save the precious resources of our environment. And that’s not all! Your K-Series amp can drive an amazing range of loudspeakers, making it one of the most versatile amplifiers ever.

  • Page 12: The Big Picture: Controls, Indicators And

    K-Series Balanced Current Amplifier™ Fig. 1.2 The Big Picture: Controls, Indicators & Connectors Page 12...
  • Page 13 K-Series Balanced Current Amplifier™ Note: K1 amplifier and CE (European) versions of both amplifiers feature identical front and back panel layouts except for product nameplates and fuse specifications. Page 13...

  • Page 14: Very Detailed Install

    K-Series Balanced Current Amplifier™ 2 Very Detailed Install Follow these instructions for a detailed explanation of K-Series installation procedures and options. If you just want to get up and running as quickly as possible, see the Quick Start sec- tion on page 6.

  • Page 15: Mono Mode Switches

    (You might also choose to use this configuration if you are running a distributed sound system from the K-Series amp . ) Turn the “Y” input switch to ON if you want both inputs to be connected in parallel.

  • Page 16: Typical Input Wiring

    K-Series Balanced Current Amplifier™ Connect the inputs of the K-Series amp to your mixer, preamplifier, or other equipment ahead of the amp. Two types of balanced input connectors are provided, allow- ing you to choose either 1/4-inch phone or 3-pin XLR con- nectors.

  • Page 17: Stereo Output Wiring

    4. Avoid using connectors with low current-carrying capacity, such as XLRs. 5. Do not use connectors that have any tendency to short. Connect the outputs of the K-Series amp to your loud- speakers. If the Bridge Output switch is turned OFF, con- nect the positive (+) and negative (–) leads of each...

  • Page 18: Bridge Mono Output Wiring

    K-Series Balanced Current Amplifier™ If the Bridge Output switch is turned ON, connect a mono load across the red binding posts of each channel as shown in Figure 2.6. Do NOT use the black binding posts when the Bridge Output switch is turned on.

  • Page 19: Stereo Hookup

    K-Series Balanced Current Amplifier™ Fig. 2.7 Stereo Hookup— two stacks, one amp, stereo in, stereo out. Fig. 2.8 Bridged-Mono Output Hookup— mono or stereo In, mono out—great for subs...or when you want it LOUD! Page 19...

  • Page 20: Y" Mono Input Hookup

    K-Series Balanced Current Amplifier™ Fig. 2.9 “Y” Mono Input Hookup—Great for when you want independent level controls for monitors and main stacks Fig. 2.10 Y” Mono Input to Bridged-Mono Output “ Hookup—When you want plenty of power such as running a sub-bass and you need to daisy chain the input signal.

  • Page 21: Operation

    K-Series Balanced Current Amplifier™ Fig. 3.1 Front Panel Indicators & Controls 3 Operation Operating a K-Series amp is really fun! Indicators TLC: The TLC (thermal level control) indicators turn on with a dim glow a little before the amplifier needs help dissipating heat.
  • Page 22 K-Series Balanced Current Amplifier™ IOC: The yellow Input/Output Comparator indicators are super-sensitive distortion indicators that turn on long before ⁄ distortion is audible (approximately the level that would 30th trigger one of the Clip indicators). This circuit compares the actual waveforms of the input and output. It immediately alerts you of any distortion that exceeds 0.05% to provide dynamic...

  • Page 23: Back Panel Controls

    K-Series Balanced Current Amplifier™ Fig. 3.2 Back Panel Controls Note: Your amplifier is equipped with a state-of-the-art soft- start feature so you do not need to delay the turn-on of K- Series amplifiers in large installations. 4 After the Enable light turns on, test the operating range of your input by turning up the level of your audio source to the highest possible operating level.
  • Page 24 K-Series Balanced Current Amplifier™ 1) Verify that the mixer is operating at its correct output level. See if there is a +4/-10 dB switch on the output; if so, set it to the +4 dB position. 2) Turn the amplifier level controls all the way down (counter-clockwise).

  • Page 25: Back Panel Fuse Location

    K-Series Balanced Current Amplifier™ Bridge Output: This on/off switch combines the two amplifier out- put channels into a single mono channel with twice the voltage of the single channels. This means the output will be much more powerful! It does this by bridging the outputs, and it requires spe- cial loudspeaker wiring.

  • Page 26: Other Issues

    With the K-Series, we have made fans unnecessary for normal operation! If you are operating the K-Series amp in very high ambient tem- peratures, or if you notice theTLC indicators starting to illuminate, do not despair! Typically, modest amounts of air movement will enable your amp to dissipate any excessive heat and regain its normal composure.
  • Page 27 Regardless of your operating conditions, the K-Series amplifier only dissipates the same heat as two100-watt lightbulbs. This will be hot to touch, but even in such extreme conditions, your K-Se- ries amplifier will not suffer any ill effects.

  • Page 28: Balanced & Unbalanced Input Wiring

    K-Series Balanced Current Amplifier™ Balancing the Line A balanced audio circuit typically will have both positive (+) and negative (–) legs of the circuit that are isolated from the ground circuit. These balanced legs exhibit identical imped- ance characteristics with respect to ground, and may also carry the audio signal at the same level, but with opposite po- larities.

  • Page 29: Balanced Input Wiring

    K-Series Balanced Current Amplifier™ Hum and Buzz Tips 1. It is imperative that all of your electrical equipment share the same power ground reference. 2. Unless you are interfacing to a microphone, the shield of the cable should only be connected at one end. (See Fig. 4.2.) 3.

  • Page 30: Unbalanced Input Wiring

    K-Series Balanced Current Amplifier™ Fig. 4.3 Unbalanced Input Wiring Page 30...

  • Page 31: Specifications

    K-Series Balanced Current Amplifier™ 5 Specifications Note: All specifications relate to both the K1 and K2 amplifiers in both 50- and 60-Hz versions, unless noted otherwise. Performance...Just How Good Is It? Frequency Response: ±0.25 dB from 20 Hz to 20 kHz. The...
  • Page 32 K-Series Balanced Current Amplifier™ “Y” Input: An on/off switch located on the back panel between the input connectors which, when turned on, parallels the two input channels. Indicators TLC: A TLC (thermal level control) LED for each channel which turns on with a dim glow shortly before the amplifier needs help dissipating heat.
  • Page 33 Bridge-Mono: Balanced, single-channel. Channel 1 controls are active; Channel 2 should be turned down. Protection, Dont leave home without it! K-Series amplifiers are protected against shorted, open or mis- matched loads; overloaded power supplies; excessive tem- perature, chain destruction phenomena, input overload damage and high-frequency blowups.
  • Page 34 K-Series Balanced Current Amplifier™ Construction Beautiful cast-aluminum front panel from hand-crafted mold. Lovingly coated with the most durable powder coat. Front panel labels are painstakingly printed in color on Lexan for durability and fingerprint resistance (fully chocolate proof). Alu- minum chassis with durable black finish.

  • Page 35: Awesome Frequency (Amplitude) Response

    K-Series Balanced Current Amplifier™ Test of K2 Amp, Serial Number 106390!! -10.0 -20.0 10 K 100 K FREQUENCY (Hz) Fig. 5.1 Awesome Frequency (Amplitude) Response 100,000 10,000 DAMPING MA-2400 1,000 Brand X 001 1000 FREQUENCY (Hz) Fig. 5.2 Superior Damping Factor Provides...

  • Page 36: Service

    K-Series Balanced Current Amplifier™ 6 Service Your amplifier should only be serviced by a fully trained techni- cian at an authorized service center. CAUTION: To prevent electric shock, do not remove cov- ers. No user serviceable parts inside. Refer servicing to a qualified technician.
  • Page 37 K-Series Balanced Current Amplifier™ after receiving copies of the shipping receipts. Shipments should be sent “UPS ground.” (If the unit is under warranty, you may send it C.O.D. for the cost of freight via UPS ground.) The factory will return it via UPS ground. Please contact us if other arrangements are required.
  • Page 38 THREE YEAR FULL WARRANTY...
  • Page 39 WORLDWIDE SUMMARY OF WARRANTY The Crown Audio Division of Crown International, Inc., 1718 West Mishawaka Road, Elkhart, Indiana 46517-4095 U.S.A. warrants to you, the ORIGINAL PURCHASER and ANY SUBSEQUENT OWNER of each NEW Crown product, for a period of three (3) years from the date of purchase by the original purchaser (the “warranty period”) that...
  • Page 41 Crown Factory Service Information Shipping Address: Crown International, Inc., Factory Service, Plant 2 SW, 1718 W. Mishawaka Rd., Elkhart, IN U.S.A. 46517 Phone: 1-800-342-6939 or 1-219-294-8200 Fax: 1-219-294-8124 Owner’s Name: __________________________________________________________ Shipping Address: _______________________________________________________ Phone Number: _______________________ Fax Number: ___________________ Model: _______________________________ Serial Number: _________________ Purchase Date: __________________________________________________________...

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K2K1K series

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