Krell Industries KST100 User's Manual
Contents
1. OUTPUT VOLTAGE 80 volts peak to peak 8 ohms OUTPUT POWER All readings are continuous output power per channel 8 ohms 100 watts 4 ohms 200 watts 2 ohms 400 watts 1 ohm 800 watts DIMENSIONS 18 0 WIDE 14 8 DEEP with handles 6 5 HIGH with feet SHIPPING WEIGHT 60 pounds 14 K WARRANTY AND SERVICE INFORMATION There are no user serviceable parts inside the KST 100 The KST 100 has a limited ker ry of five years parts and labor Return freight is included in the warranty The warranty period begins on the date of purchase and is activated with the return of the enclosed Warranty Card and a copy of the Sales receipt Please return the war ranty card immediately after successful installation and operation are completed The warranty for Krell products is valid only in the coun try to which they were originally shipped and at the factory If you think there are problems with your unit lease contact your dealer distributor or the factory immediately Please do not return any unit to KRELL for repair with out first calling to discuss the problem and to obtain a Return Authorization number Freight to the factory or distributor is your responsibility Return freight to you will be paid by the factory or distributor Any unauthorized updates or modifications performed to the unit will void the warranty 15 ee PANS AGNVALINVIUVMA EEE EE KRELL INDUSTRIES 45 CONNAIR RD ORANGE CT 06477 SA2. KST 100 OWNER S REFERENCE A INTRODUCTION Thank you for your purchase of the KRELL KST 100 power amplifier This amplifier represents the latest evolution in amplifier technology and incorporates many innovative design features To obtain the best performance from your KST 100 careful attention should be paid to placement installation and operation A thorough understanding of these details will DE insure satisfactory operation and long life for the KST 100 and related system components This Owner s Reference is divided into several sections each designed to perform a different function As you read through this Owner s Reference you will become better acquainted with the features and functions that make the KST 100 a superb value A Question and An swer section is also included where answers to common questions are provided Should you have any questions or suggestions please feel free to contact your authorized dealer or the KRELL staff for assistance In the unlikely event that your KST 100 should require service Jon will be pleased to know that it is backed by a comprehensive Customer Satisfaction policy and one of the most advanced service facilities in the industry For detailed information on the terms and conditions of ser vice please consult Jon warranty registration card your authorized KRELL Dealer or Distributor TABLE OF CONTENTS 10 11 12 14 15 UNPACKIN G AND ASSEMBLY BASIC INSTALLATION
3. AND OPERATION INPUT AND OUTPUT CONNECTIONS AMPLIFIER OPERATION PROTECTION CIRCUITRY MONAURAL CONVERSION OPERATION REAR PANEL DESCRIPTIONS QUESTIONS AND ANSWERS SPECIFICATIONS WARRANTY AND SERVICE INFORMATION NOLLOAGOULNI GE B UNPACKING AND ASSEMBLY NOTE Do to the weight of the KST 100 it is strongly advised that unpacking and placement is completed by at least two individuals 1 Open the box on one end 2 Fold back the flaps on all four sides of the box and carefully roll it over on to the exposed end 3 Pull the box straight up and off exposing the foam packing material 4 Lay the foam container down on the floor and pull off the top section The following items will now be visible I KST 100 stereo amplifier 1 Warranty card 1 AC power cord 4 Rubber bottoms NOTE If any of these items are not included please contact your authorized dealer immediately for assis tance 5 Pull the amplifier out of the remaining layer of foam 6 Remove the plastic bag from the amplifier NOTE Save all packing materials If you must ship your KST 100 in the future repack the unit in its original packaging to prevent transit damage CAUTION Do not connect the power cord into the AC mains before completing the Installation section C BASIC INSTALLATION AND OPERATION 1 Place the KST 100 on a firm level surface away from excessive dirt or moisture Ideally the amplifier should be placed as clo
4. LES 203 799 9954 FAX 203 799 9796 COPYRIGHT 1992 KRELL INDUSTRIES KST9204
5. connected to the speakers After the protection circuits have determined that the unit has completely stabilized the speaker relays will be engaged You will hear a click at this point The amplifier is now ready to use The amplifier will be at temperature and sound its best after approximately 30 minutes 2 With the preamplifier in the Mute position or volume control fully attenuated select a source Turn the volume control up to your desired listening level 3 Understanding the operation of the amplifier is very easy Equally important is an understanding of the care that should be exercised when operating the system as a whole in relation to the enormous power output of the KST 100 Simple mistakes such as switching between active sources without muting the preamplifier output or bumping miscuing a cartridge can generate large tran sients at low frequencies With this type of transient the KST 100 can generate enough En to damage most loudspeakers All switching of sources should be done with the preamplifier level either muted or fully attenu ated Inputs to the amplifier should not be changed while the amplifier is on NOTE Care must be taken when setting high playback levels Because of their tremendous reserve of clean power KRELL amplifiers safely drive speakers to higher sound pressure levels than other amplifiers This also means driving the speakers to their limit Always turn the level down at the first sign of
6. distortion a When turning the system off the amplifier should ALWAYS be first This avoids the possibility of a turn off transient from some other component getting to the speakers F PROTECTION CIRCUITRY There are no fuses in the KST 100 The amplifier is protected by a series of non intrusive opto coupled circuits that constantly evaluate the amplifier s operation Appropriate protective action exists for DC conditions short circuit oscillation AC power anomalies high round resistance and out of phase ground Collectively the protection circuitry is designed to avoid damage to the amplifier or speakers caused by other defective com ponents faulty wiring mishandling of the system or amplifier failure When the protection circuit is engaged the amplifier will shut off and short its output After _ resolving either the input or output problem the amplifier can be turned on The amplifier also has a circuit breaker type power switch that protects it from excessive AC current draw Should the breaker shut off frequently or become difficult to push ON contact your dealer or Krell Industries m NOVNO TRE nen ERTER See TEE reperasjon eee Nee Drea ekorn Pree cee mee nen fone brt ee eee te me em EEE a EAA ee a seta G MONAURAL CONVERSION AND OPERATION The KST 100 can be easily converted into a 400 watt monaural amplifier To switch the amplifier to mono follow these instructions 1 Remove the topcover
7. from the amplifier via 8 topcover Screws 2 Find the toggle switch located at the rear of the ampli fier mounted on the circuitboard Move the toggle switch over to the Mono setting printed on the circuitboard 3 Reinstall the topcover and the 8 topcover screws OPERATION 1 The input of the KST 100 in Mono operation is the Left channel input only Connect the Left output of your preamplifier to the Left channel input of the designated left channel mono ampli fier Connect the right output of your preamplifier to the left channel input of the designated right channel mono amplifier 2 The output of the KST 100 in Mono operation is the reke outside binding posts of each channel The inside r binding post of each channel in mono is not opera tional Connect the left and right channel outer binding posts on each amplifier to the loudspeaker NOTE Pay careful attention to the labeling on the backpanel of the KST 100 when making input and output connections Connecting this amplifier for monaural operation can become confusing 10 H REAR PANEL DESCRIPTIONS INPUTS Balanced via 3 pin XLR connector Single ended via RCA connector XLR PIN CONFIGURATION pin 1 Shield ground pin 2 Non inverting or 0 degrees hot pin 3 Inverting or 180 degrees OUTPUT Two pairs of five way binding posts in parallel per channe OTHER Standard AC receptacle 20 amp circuit breaker type power switch OPTIONS Black Facep
8. late es NOLLVHUAdO TIVYOVNON EE 11 I QUESTIONS AND ANSWERS Q Should I leave the KST 100 ON at all times A Although you could leave the KST 100 ON at all times without fear of damage to the amplifier we recom mend 30 minutes of warm up before critical listening and switching the amplifier off when not in use When I push the power switch on the front of the r ST 100 the amplifier doesn t turn ON What should I oy A Unplug the amplifier from the AC receptacle and remove the input from the amplifier Check the output connections then plug the amplifier back in Push the power switch on the front panel If the power switch resists being turned ON or shuts OFF once engaged unplug the unit and call your dealer or Krell industries Q When I turn the amplifier on there is a loud hum gt through the speakers There was never a hum before the KST 100 was in the system What should I do A Often when a new component is introduced into an audio system a hum may become present This is often caused by a ground loop in the system Try putting a 3 prong to 2 pone AC adaptor cheater plug on the AC power cord lifting the ground from the unit This should make the hum disappear If not try another adaptor else where in the system NOTE Always keep one major audio component grounded NOTE Even though the ground is lifted from the power amplifier it is still grounded via the interconnect cables th
9. n the KST 100 can be used in several differ ent ways They are made from machined Delrin and are ae i with separate threaded rubber bottoms The rubber bottoms can be screwed into the feet for protec tion of fragile surfaces such as hardwood floors or furni ture For use on rugs we recommend using the feet with out the rubber bottoms KST 100 feet can also accept the KRELL AMDs Acoustic Mass Damper These improve the amplifier s sonic performance in most installations ee NOL VSN sm D INPUT AND OUTPUT CONNECTIONS CAUTION When making connections to this component or any other make sure the power amplifier is OFF and the preamplifier is in the MUTE or STANDBY mode 1 Connect the speaker cables to the output terminals of the amplifier The KST 100 utilizes two sets of parallel 5 way binding posts for the left and right channels This configuration makes cable connections and bi wiring simple NOTE The binding posts are of the highest quality but will break if overtightened Insert wire or spade lug into the connector and tighten until there is no movement from the cable CAUTION Make sure all cable terminations are of the or quality free from frayed ends shorts or cold solder joints 2 Connect the interconnect cables from your preampli fier to the input of the KST 100 The wiring to and from the amplifier and all components in general should be arranged in a neat organized man ner Specificall
10. roughout the rest of the system Q Can I use special audio power cords on the KST 100 A You can experiment with special power cords as long as they are grounded on both ends and meet the amplifier s 15 amp power requirement 12 Q After the amplifier is playing for about one hour it becomes very hot Is this normal A Yes Due to the design of the KST 100 it will become quite warm when driven hard If the amplifier should have a severe ri opi inbalance between the left and right channel unplug the unit and call your authorized dealer or Krell Q I tried a new preamplifier in my audio system and when I turned the unit on the KST 100 shut off Is the amplifier defective A More than likely the amplifier is not defective When connecting components you should always keep the amplifier off The amplifer sensed a bad input signal and shut off protecting itself and the speakers l There also could have been a bad cable connection or excessive DC offset coming from the output of the pre amplifier Before turning the amplifier on check the input cables If that doesn t help bring the preamplifier to the dealer for testing 13 es 1 1MSNV UNV SNOLLSA10 m I SPECIFICATIONS KST 100 GAIN 26dB SIGNAL TO NOISE 102dB unweighted THD 1K at 8 ohms less than 1 20K at 8 ohms less than 3 INPUT IMPEDANCE 47 000 ohms 47K INPUT SENSITIVITY 1 5 volts for 100 watts out OUTPUT IMPEDANCE 1 ohms
11. se to the speakers as possible It 1s always preferable to run long interconnect cables to the amplifier and keep speaker cable length to a minimum Speaker cable does add an impedance at the output of the ampli fier regardless of the cable s guage All KRELL amplifi ers will drive the lowest impedances with ease When impedance is added the amplifier s power is literally wasted in driving cable Long speaker cables reduce the maximum power that can be delivered to the speakers 2 Amplifiers dissipate much of the power they consume in heat The KST 100 should be installed in a location that provides unobstructed ventilation If you have to install the unit on shelves or in a cabinet extra ventilation may be necessary This can be accomplished with whis per type fans Consult your dealer for assistance Generally with the front and rear of a cabinet open 2 3 inches of clearance on each side and 8 inches of clear me above the amplifier should provide adequate venti ation The exact dimensions for the KST 100 are in the Specifi cations Section below 3 The KST 100 should have a dedicated line and should only be operated with the power cord ae Use of other power cords may Kg the amplifier or void its warranty Please consult KRELL or your dealer BEFORE using any devices designed to alter or stabilize the AC power for the KST 100 If you have any questions about pae men or AC power conditions please consult 4 The feet o
12. y AC wires should be separated from audio wires This practice avoids hum or other unwanted noise from being induced into the system The KST 100 has balanced and single ended inputs The balanced inputs use 3 pin XLR connectors and the single ended inputs use standard RCA connectors CAUTION Use only one input to the amplifier at a time The KST 100 is pa with shorting pins in the XLR inputs These pins should remain in the XLR inputs if ou are operating the KST 100 in the single ended mode hen the ne pun is inserted pin 1 and pin 3 are shorted together The shorting pins must be removed to connect the KST 100 for balanced operation pin I shield ground pin 2 non inverting input hot pin 3 inverting input NOTE The RCA center conductor for each channel is wired in parallel with pin 2 the non inverted input Only one of these inputs should be connected to preamplifier The pm assignment for the XLR is 3 Insert the AC power cord into the receptacle located on the back of the KST 100 Insert the other end into the wall AC receptacle Refer to section C Basic Installa tion and Operation for AC power requirements es 6 NOLLDHNNOO BEI E AMPLIFIER OPERATION I Push the black breaker type switch on the front of the amplifier to turn it on The LED in the switch will illumi nate When turning on the system the amplifier should always be last Upon turn on the amplifier s outputs are not
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