Active Studio Monitor O 110 Installation and Operation KLEIN + HUMMEL GmbH Zeppelinstr. 12 73760 Ostfildern/Germany 058-E0016 Version 21-10-2002 Tel.: + 49 - (0)711 - 45893 - 0 Fax: + 49 - (0)711 - 45893 - 35 email: info@klein-hummel.de h t t p : / / w w w. k l e i n - h u m m e l . d e Safety Instructions It is absolutely essential that you read these safety instructions carefully before connecting and using this K+H product. Your safety depends on it. Furthermore, failure to follow these instructions voids the warranty. To ensure safe operation for years to come, keep these instructions in a safe place for future reference. K+H has manufactured this product in accordance with IEC 92 (SEC) 39 standards, then tested and delivered it in safe operating condition. To maintain it in this condition, you must: · · · · observe all safety instructions, use the product only as described herein, have any maintenance, repairs, or modifications performed only by K+H or other authorized personnel, and ensure that the room in which you use this product is wired in accordance with the local electrical code. Warning! · When the interior of the cabinet is exposed, touching some parts can lead to an electric shock. · If you need to gain access to the interior electronics of the unit, always disconnect the unit from any and all power sources first. · Any repairs, maintenance, or other service of the unit when its interior compartment is exposed may only be performed safely (in accordance with VBG 4) by authorized technicians familiar with all the risks involved. Even in an unplugged state, a fully charged capacitor in the unit can zap the unsuspecting. · Loudspeaker output jacks labeled with the IEC 417/5036 emblem (Fig. A, right) may be carrying dangerously high voltages. If your unit has this emblem, ensure that any connections to be made between these jacks and the speakers themselves are made before powering up the unit, and are done so only with manufacturer-approved interconnecting cables. · If you need to replace any fuses, ensure that the replacements are of exactly the same type, value and voltage as the originals, as spelled out in the technical specifications at the rear of this manual. · Do not use "repaired" fuses. Fig. A · If you do not have any fuses on hand of the specified size, type, and value, do not hot-wire the contacts in the holder by short-circuiting them. · Certain areas of the cabinet, cover, and rear panel can achieve extreme temperatures and are therefore marked with a "HOT" label (Fig. B). Refrain from touching any heat sink or ventilation grille. · High volume levels are known to cause permanent - i.e. irreversible - hearing damage, especially when listened to without sufficient breaks. The higher the levels, the more frequent and extended must be the breaks. Avoid standing too close to loudspeakers that are being driven at high levels. If you must be exposed to high sound pressure levels over an extended period of time, use hearing protection. Fig. B Mains Connection: · This unit is designed for continuous operation. · Ensure that the operating voltage of the unit matches that of the local mains current (AC line voltage). · Always check before connecting the power cable to the mains socket that the power switch on the unit itself is set to off ("O"). · Use the power cable or power supply that came with the unit to connect to the mains socket (wall outlet). · Power supply: a damaged power cable may not be repaired. Use a new cable. · Avoid plugging the mains cable into a power strip that already has several other power-consuming devices connected to it. · Avoid using extension cables. The unit must be connected to a mains socket close to it, and that socket should be freely accessible. Installation: · This product may only be placed on a stable, clean, horizontal surface. · Do not expose this product to vibration. · Do not operate this product anywhere near water or other liquids. Do not use it near a sink, swimming pool, bathtub, or in any damp room or area. Electrical shocks carried through water can kill. Do not place any beverages whatsoever on or near this product, as liquids can kill electronic components. · Ensure sufficient ventilation around the product to allow for adequate heat dissipation, especially near the rear panel and the sides of the cabinet (minimum of 8 inches from the nearest wall). The unit may only be installed in a rack if measures are taken to ensure sufficient ventilation and if the mounting instructions of the manufacturer are followed. Do not block or cover any heat sink, fan, or vent. · Do not place the product where it will be in the path of direct sunlight, and keep it a safe distance away from radiators and other heaters of any kind. · If you bring this product from a cold environment into a warm one (such as from a vehicle into a studio), it is quite possible that condensation will form inside the cabinet. Please allow the unit sufficient time for acclimatisation to room temperature (minimum thirty minutes) before connecting and powering up. · To avoid accidents, do not use any accessory equipment with this product which is not approved by the manufacturer, particularly mounting accessories. Do not place this unit on any unstable platform, cart, stand or table. Should the unit fall, it can cause bodily injury to persons, or can be damaged itself. · To protect this product from lightning damage during a thunderstorm or from power surges during an extended absence, disconnect the power cable from the wall outlet. Page 2 Active Studio Monitor O 110 Active Studio Monitor KLEIN + HUMMEL O 110 Installation - Operation Figure 1: Front view of the O 110 Figure 2: Rear panel of the O 110 Table of Contents: Safety Instructions......................................................2 Table of Contents........................................................3 1. Installation and Operation.......................................4 1.1 Operating Conditions........................................4 1.2 Installation.........................................................4 1.3 Connection to Mains Current............................4 1.4 POWER Switch.................................................4 1.5 Level / Room Compensation / Ground Lift........4 1.5.1 Input Level Adjustment................................4 1.5.2 Equalization.................................................4 1.5.3 Ground Lift...................................................5 1.6 Mains Power Fuse...............................................5 1.7 Display Functions................................................5 1.7.1 Overload Protection....................................5 1.8 Care of the Cabinet............................................6 2. Diagrams.................................................................6 3. Warranty Information...............................................8 4. Technical Specifications..........................................9 Active Studio Monitor O 110 Page 3 1. Installation and Operation It is absolutely essential that you read and observe the Safety Instructions on page 2 before connecting or using this device. 1.3 Connection to Mains Current The amplifier electronics within the O 110 are set up for an AC line voltage of 230 volts, 50 or 60 cycles per second. For export, special versions with other AC voltages are also available. If it becomes necessary to use a different mainscable plug, pay attention to proper grounding when wiring a replacement plug. 1.1 Operating Conditions The K+H model O 110 active studio monitor is intended for use over a range of ambient temperatures from +10° C to +40° C (+50° F to +104° F). During transpor t or storage, temperatures from -25° C to +70° C (-13° F to 158° F) are permissible. 1.4 POWER Switch When you switch power on, there is a 7 second delay before the amplified signal is sent to the loudspeakers. This delay avoids the loud popping sounds that otherwise are generated by prior devices in the signal chain as they are switched on. You will find this arrangement particularly useful if your studio uses a master switch to power up all the equipment at once. When power on the O 110 is turned off, on the other hand, or if there is a general power failure in the area, the signal flow to the speaker is immediately stopped, preventing any loud pops. 1.2 Installation The loudspeaker chassis used in the O 110 are magnetically shielded, allowing these loudspeakers to be mounted side by side with a video or computer monitor without adversely affecting the screen. One of the finer features of the O 110 active studio monitor is its unusually uniform off - axis directivity, which results in a very wide "sweet spot". Preferred placement of the cabinet is in the upright position, for the dispersion in the verical plane was intentionally kept narrower than in the horizontal. In certain cases, for example if there are hard, reflective surfaces both to the left and right of the loudspeakers, it would make sense to operate the loudspeakers on their side. The reduced horizontal directivity in this position would then be helpful in minimizing any phase cancellation caused by comb - filter effects. When considering placement, please take into consideration the possibilities offered by both of the room compensation switches described in section 1.5.2. On the back of the unit you will find two M8-style threaded bushings for use with various mounting options. These holes are labeled "Speaker mount option." The bushings will accommodate either the LH 32 wall bracket adapter or the LH 31 mounting bracket for use with additional mounting accessories. The plastic screws that occupy these threaded holes from the factory may not be used for the actual mounting of a loudspeaker under any circumstances. 1.5 Level / Room Compensation / Ground Lift 1.5.1 Input Level Adjustment The sensitivity of the electronically balanced input is rated at +6 dBu (1.55 volts). The three - pole female XLR jack is wired in the standard manner (pin 1 = ground, pin 2 = +, pin 3 = negative). If you are connecting unbalanced sources, you will need to solder a bridge between pins 1 and 3: unbalanced balanced as seen from solder terminals of male XLR Figure 3: Pin layout of input connector Directly beside this XLR jack you will find the ATTENUATOR pot, which allows for smooth, gradual damping of the input signal by anywhere from 0 to 24 dB. As an option, you can order the O 110 with transformer - balanced inputs. ! 1.5.2 Equalization 1.5.2.1 BASS Switch The four-position rotary switch labeled BASS (see Figure 2, Equalization section) serves to alter the frequency response of the loudspeaker to compensate for the overemphasis of low frequencies that may result from the specific location at which the speaker is placed within the room: Active Studio Monitor O 110 Please ensure that these threaded holes are always plugged so that the volume of air sealed within the cabinet may only pass through the precisely calculated bass - reflex openings. Page 4 Position 0 = free standing Position 1 = placement a short distance before a wall Position 2 = placement flat against a wall Position 3 = placement in a corner of the room circuit board below the XLR jack. The arrow is pointing to a jumper, which by default bridges the two pins. If you remove the jumper the signal ground is lifted from the chassis ground. Of course the chassis ground always remains connected to the protective earth conductor. Warning! The protective earth conductor must never be interrupted even for test purposes! This may be dangerous to life! 1.5.2.2 MID Switch If the loudspeakers are placed on the meter bridge, a certain overemphasis in the midrange will typically result. Next to the four-position switch for room compensation which we just described, there is another four-way rotary switch labeled MID. The four switch settings are intended for the following kinds of placement: Position 0 = Position A = Position B = Position C = free standing placement on a table top free standing on the meter bridge on the meter bridge between other equipment directly on either side, or built into a wall. ! 1.6 Mains Power Fuse Should you ever need to replace the power fuse, please ensure (first of all that the unit is unplugged from the mains!) and that only the following type and value of fuse is used: For 230-240 volts AC: 1 A Slo-Blo (5 x 20 mm) For 117 volts AC: 2 A Slo-Blo (5 x 20 mm) For 100 volts AC: 2.5 A Slo-Blo (5 x 20 mm) Note: Since it is not possible to list all possible combinations of speaker placement and room acoustics, we strongly recommend checking the switch settings acoustically or by measurement. The frequency response curves of both equalizers are shown in Figure 12 in section 2, diagrams. 1.7 Display Functions The illuminated K+H logo serves as a status display for the loudspeaker when the power switch is o ...