MX2275e - Knoll Systems
Contents
1. Warranty Knoll Systems warrants MX2275e 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 Gold RCA jacks with adjustable gain Input impedance 50k Q Outputs detachable plug 275 watts RMS per channel 4 Q 205 watts RMS per channel 8 Q 350 watts per channel 8 Q Output power Peak output power Ideal impedance 4 82 Frequency response S N ratio THD distortion IMD distortion Dimensions Fan Noise Power Weight 10 Hz 40 kHz 1dB 1w over 108 dB A weighted 250 watts less than 0 1 20 Hz to 20 kHz less than 0 01 60 Hz 7 kHz 4 1 SMPTE 17 x 3 5 x 11 5 432 x 89 x 292mm quiet 26 dBA 850 watts at 117 VAC or 230 VAC 21 Ibs 9 5 kg Note Specificati2. automatically restores the amplifier channel as soon as its parameter returns to the safe operating area e Individual input gain adjustment Each channel features an input gain adjustment pot to adjust each channel for gain and speaker sensitivity variations e Eco System power on off The MX2275e has defeatable circuitry to automatically turn the power off and on as needed saving energy e Stackable 17 chassis 19 rack ears available e Two optional control modules MX2275v attaches to a rotary decora style wall mounted volume control available in white light almond almond ivory and black colors MX2275rs has a RS232 port that controls the amplifier power off on volume balance bass and treble allowing it to be controlled by whole home controllers tablets smart phones etc 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 amplifiers 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 ground
3. 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 th
4. e 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 MX2275e amplifier does not contain any user serviceable parts inside If you suspect a problem that may require servicing contact us at www knollsystems com contact html or by phone at 604 940 1689 Troubleshooting If a problem is encountered with the MX2275e 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 MX2275e is plugged in not light no sound 2 Test the AC outlet with a lamp 3 Try adjusting the SENS on the amplifier back 4 Check MX2275e power button on in Sound cuts out 1 Verify speaker impedance is 4 16 Q Changing speakers may be required 2 Check if the MX2275e feels hot If it is hot increase cooling see Installation Turn the volume down Check speakers for damage Check inputs for proper levels MX2275e gain and source output level may have to be adjusted 4 Speakers may be less than 4 Q Sound is distorted WN e MX2275e does Push MX2275e power switch off out not turn off 2 Eco System may need SENS adjustm
5. eally 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 the AC power into an outlet that supplies at least 8 amps 120 VAC mains or 4 amps 230 VAC mains 1000 watts dedicated to each MX2275e Caution Never listen to sound that is distorted If distorted sound is heard turn the volume down immediately or speaker and or amplifier damage can occur that is not covered by the warranty If this problem persists contact your dealer User adjustments and service There are no user adjustments on the MX2275e Your installer may make certain gain level adjustments on the rear panel Caution The MX2275e contains no user serviceable parts so do not attempt to open or repair the MX2275e Refer servicing to a qualified technician only or contact the factory for information Speaker wire should be 14 gauge minimum and if the wire runs are longer than 30 10 meters the wire should be Start with the SENS Adjusted to the middle If the amp larger typically 12 gauge or larger takes too long or too little time to shut down adjust the SENS pot IE SHOCK DO NOT 0 PEN WARNING To reduce the risk of electric shock BA do not expose this apparatus to rain or moisture i20V Knoll Systems Point Roberts WA USA ECOSYSTEM amp Delta BC Canada
6. ent on amplifier back 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 MX2275e 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 MX2275e is cooling The MX2275e 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 requires 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 MX2275e channels frequently shutdown due to overheating install a fan directed up from the MX2275e bottom center 4 Never operate the MX2275e on its side as the cooling potential drops significantly when operated this way 5 Connect the MX2275e inputs to the source component outputs with good quality short as possible RCA jack cables 6 Connect the MX2275e speaker outputs to speakers using good quality speaker wire Minimum 14 gauge copper wire is recommended with 12 gauge minimum for runs over 30 10m Note Ideally the MX2275e likes 6 8 Q loads Connecting to 4 Q loads won t hurt the MX2275e but it may occasionally shutdown due to overloading Never connect to speaker loads less than 4 Q 7 Individually adjust the channel gains as required Id
7. i i vee Stereo High ANTRA PR Current Amplifier og MX2275e Ap Made in Canada Fabrique au Canada Gains are normally left on full The MX2275e is designed to work in three modes Without clockwise but may be adjusted an optional internal module it is an amplifier with Eco AL ret a a System power savings With one module an external wall the left mounted rotary volume control controls the volume connected by a single cat5e wire With the second Caution NEVER connect the T MX2275e to impedances less module control is from an RS232 port and the amplifier than 4 Q or amplifier can be completely controlled by a laptop smart phone damage not covered by the tablet or whole house controller warranty may occur Made in Canada
8. ing prong The wide blade or the third prongs are provided for your safety If the provided plug does not fit 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 specified by the manufacturer 12 Use only with the cart stand tripod bracket or table specified 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 qualified 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 amplifier be short circuited 16 Be sure that the loudspeakers connected can handle the output power of the amplifier at the loudspeakers rated impedance The warranty on the amplifier does not cover damage to loudspeakers that have inadequate power handling capabilities 17 Where an all pole MAINS SWITCH is used as the disc
9. onnect 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 off and on 19 ALED is used to show when the apparatus is powered on CAUTION These servicing instructions are for use by qualified 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 qualified 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
10. ons 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 MX2275e High Current Stereo Amplifier Installation Instructions v1 0 knoll Warning To be installed and or used in accordance with appropriate electrical codes and regulations Description Designed primarily for the custom install industry the MX2275e is for use with high power speakers It features excellent sound quality thanks to advanced class A B circuitry To save power it features an internal Eco SYSTEM circuit to automatically turn off power to the amplifier when it is not needed The automatic turn on time is less than 20 1000 of a second so no music is ever lost Two optional modules are available for the MX2275e One allows the use of a wall mounted rotary volume control The other is a RS232 controller board that controls the amplifier power off on volume balance bass and treble allowing it to be controlled by whole home controllers tablets Smart phones etc The MX2275e amplifier is designed to meet the amplifier needs of custom installed systems where high quality sound is a specific requirement Key Features e Automatic protection circuitry Each MX2275e channel is individually and fully protected against low impedance overheating overloading over voltage and under voltage The protection circuitry
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