A-120 Owner`s Manual
Contents
1. A 120 OWNER S MANUAL 300 Watt Powered Subwoofer 12 EXTRA LONG THROW Heavy Duty Woofer FREE STANDING POWERED SUBIDAS IMPORTANT SAFETY INSTRUCTIONS _ Read these instructions Keep these instructions Heed all warnings Follow all instructions Do not use this apparatus near water Clean only with dry cloth Do not block any ventilation openings Install in accordance with the manufacturer s instructions Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat 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 prong are provided for your safety If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Protect the power cord from being walked on or pinched particularly at plugs convenience receptacles and the point where they exit from the apparatus Only use attachments accessories specified by the manufacturer Unplug this apparatus during lightning storms or when unused for long periods of time Refer all servicing to qualified service personnel Servicing is required when the apparatus has been dam aged in any way such as power supply cord or plug is damaged liquid has been spilled2. If you choose to bypass the internal crossover and use an external crossover such as those located in most modern receivers and processors then you will need to fine tune the system based on the adjustments provided by the manufacturer of your electronics in conjunction with the Level and Phase controls on the A 120 Note the Level and Phase adjustments on the A 120 are not bypassed and will still function as indicated above To bypass the internal crossover move the Crossover switch 6 to the Bypass position The subwoofer will now pass signals up to approximately 300Hz Auto Power Mode Switch The A 120 contains a circuit that automatically powers up the amplifier when a signal is detected The same circuit also places the A 120 into standby mode when no signal has been detected for a period of approximately 10 minutes This signal sensing circuit can be bypassed by switching the Auto switch 2 to the OFF position if it is preferable to control the A 120 s power with a remotely operated power source SPECIFICATIONS m Frequency Response 28Hz 300Hz System Response m Crossover Frequency 40Hz 120Hz Low pass filter with bypass switch m Phase Adjustment lt s 0 180 degrees Continuously variable m Amplifier Output Power 300 watts with thermal and clipping limiters m Audio Inputs eetere Summing stereo line level RCA x2 LFE RCA shared with Left input connector Speaker level
3. SETUP yz Placement There are a number of factors both acoustic and aesthetic that ultimately determine the best loudspeaker placement Subwoofers by nature of the frequency range in which they operate have their own challenges which have as much to do with the room acoustics and listening position as anything else In many cases the designated location may already be chosen and the only available adjustments may be the subwoofer s controls The A 120 controls will allow you to make the best of virtually any installation If you feel uncomfortable with setting up your A 120 after reading through this section then you should consider enlisting the help of an experienced person or contacting your dealer Below are a some generalized rules for understanding the acoustic nature of low frequency sound reproduction in an average residential listening room These rules will aid in the placement and tuning of your A 120 subwoofer If possible experiment with the placement of your A 120 to determine what works best in your listening room Most rooms have significant resonant modes at low frequencies The listener will experience these resonant modes as a variation in the intensity of certain frequencies at different locations within the room Resonant modes are the result of reflected acoustic energy interacting within a room s boundaries The resonant modes can produce large errors in the frequency response and reduce the overall enjoyment of the a
4. Stereo 5 way binding post E Input Impedance eee Line Level 20k ohms Unbalanced Speaker Level 220 ohms E Input DOWOissionicinindrics cis 120V 60Hz AC m nput Power Connection IEC 2 wire receptacle with integral fuse holder m Power Mains Fuse 3 15A 250V T3 15AL 5x20mm style Slow Blow m Power MOdeS gt eeeeeeeeesesrsererserees Auto signal sensing and always on m Auto Off Delay ae ee 10 minutes m DIMENSIONS eere 15 3 8 W x 17 5 16 H x 14 3 4 D 390W x 440H x 375D mm without feet E Weight E E E T A3lbs 19 5kg m Shipping Dimensions 21 W x 20 H x 20 D 533W x 508H x 508D mm m Shipping Weight 51lbs 23 2kg conform A 120 OWNER S MANUAL 10 NOTES f A 120 OWNER S MANUAL n 775 355 www oemsystems c Rev G Note Specifications are subject to change without notice For the most up to date manual information please check our website
5. outputs If an LFE Low Frequency Effect or Subwoofer output is available then skip to Option 3 since it will likely produce the best results If no LFE output is available and a line level Front Channel Output or Preamplifier Output is available then this Option 2 is the preferred method of connection E Per the Option 2 drawing on the adjacent page use a stereo RCA style patch cable and connect the left and right line level RCA style front channel outputs of your receiver or preamplifier processor to the Left Right Line Level inputs of the A 120 If the subwoofer is connected to a modern home theater receiver or processor with an available LFE or Subwoofer output then this option will likely produce the best results If no LFE or Subwoofer output is available but a line level Front Channel Output or Preamplifier Output is available then use Option 2 mE Per the Option 3 drawing on the adjacent page use a single RCA style patch cable and connect the line level RCA style LFE or Subwoofer output of your receiver or preamplifier processor to the Left LFE Line Level input of the A 120 AC Power The unit is shipped with a standard IEC AC cable Remove this cable from its packaging and insert the cord into the IEC receptacle on the back of the subwoofer It is best to connect power only after all other connections are made Connect the power cord to an AC wall receptacle or similar A 120 OWNER S MANUAL 6 CONNECTION continu
6. Feet o Q o Q o PEAT UREE The A 120 subwoofer was designed for exceptional performance and value It features a 12 extra long excursion woofer with high BI motor The bass reflex enclosure ensures extended bass response and high acoustic efficiency m The woofer is driven with an integral 300W class A B amplifier utilizing the patented BASH technology for high electrical efficiency m The integral rear mounted 300 watt amplifier includes several essential controls to contour the subwoofer s output to blend with virtually all loudspeakers and room environments These controls their operation and their adjustment are described in a later section of this manual m An integral low pass crossover network is continuously variable from 40Hz to 120Hz and can be bypassed if it is preferable to use an external crossover located in an outboard receiver or processor The A 120 s integral amplifier incorporates a defeatable signal sensing circuit that automatically powers up the amplifier when a signal is detected A double insulated isolated ground electrical supply prevents electrical ground loops and reduces the noise floor of the entire audio system m The A 120 is shipped with 8 adjustable feet 4 spiked and 4 rubber with tool less knurled jam nuts These feet can be installed in the bottom of the enclosure in either a three point triangular pattern or more traditional 4 point square pattern The bottom of the
7. be replaced by the spikes or removed if desired after the final location is determined Here are some guidelines for using the feet DO NOT try to slide your subwoofer with the feet installed This will damage the foot supports or the feet m f the A 120 is placed on carpet the spikes are likely the best choice since they will penetrate the carpet and provide a solid and stable footing for the subwoofer m f the unit is placed on a hard surface then the rubber feet should be used You may elect to use only three feet especially if the surface on which you are placing the subwoofer is uneven such as a stone or tile floor See diagram for details To install the feet Thread the knurled jam nuts onto the desired feet and then screw the feet into the appropriate holes on the bottom of the A 120 enclosure Begin with the feet screwed all the way into the enclosure Rotate the enclosure into its upright position and lower the appropriate feet to level the subwoofer and prevent it from rocking Finger tighten the knurled jam nuts against the bottom of the enclosure to secure the feet and prevent them from moving Use care not to over tighten the knurled jam nuts as they will be difficult to loosen Front of Subwoofer Front of Subwoofer Front of Subwoofer Front of Subwoofer Bottom of Subwoofer Bottom of Subwoofer Bottom of Subwoofer Bottom of Subwoofer Showing 3 Rubber Feet Showing 4 Spiked Feet Showing 3 Spiked Feet Showing 4 Rubber
8. cally locating two or more woofers in the room can be done to reduce room mode effects and to balance the localization of the sound m t is not necessary to direct the front of a subwoofer at the listening position A 120 OWNER S MANUAL EN SETUP continued O A 120 Controls The A 120 subwoofer has thee variable controls for tailoring its output to the room and to the primary speakers also known as satellites These controls are Level Crossover Frequency and Phase The control with the most audible effect is the Level control followed by the Crossover Frequency and then the Phase control which has the least audible effect The following legend shows graphically how each control affects the audio signal SPL SPL SPL dB dB dB Frequency Hz Frequency Hz Phase Degrees Level Crossover Frequency Phase Note SPL is Sound Pressure Level Volume Fine Tuning the Controls We recommend the following method as a starting point for fine tuning the A 120 subwoofer Level and Frequency A Begin with the subwoofer s Level control all the way down and the Frequency adjustment set to 120Hz With the Frequency control in this position the woofer will output higher frequencies that will likely be duplicated by the satellite speakers Satellite speakers is a term used to describe the primary listening speakers that cover the frequency range above the subwoofer s B Use familiar music with strong bass content and in
9. crease the Level control until the bass passages sound robust or slightly exaggerated Then reduce the Frequency control to blend the subwoofer with your main system speakers We have found that most speakers with 6 to 8 woofers blend well with the crossover set somewhere between 50Hz and 80Hz C Readjust the Level and the Frequency controls up or down as necessary until the bass sounds full extended and natural Use multiple musical pieces to test the system while fine tuning the controls If it sounds like your subwoofer is always producing the same bass note with different recordings it is possible that the bass level is adjusted too high Phase A When adjusting the phase use familiar music with strong bass content The phase adjustment primarily affects the frequencies where the subwoofer and the satellite soeakers overlap frequencies near the crossover frequency B Rotate the phase across its range and listen to the balance and strength of the mid bass frequencies Tune the phase adjustment so that these frequencies are detailed and distinct If they become overly strong it may be necessary to reduce the subwoofer s crossover frequency and or input level a little The effect of the phase adjustment can be subtle and it may be necessary to take some time to become acquainted with the sound before changing the adjustment A 120 OWNER S MANUAL EN SETUP continued Fine Tuning the Controls continued Crossover Switch
10. ed A UO AAKOO QARA A ANOANO II OOO LS AUDIO as CENTER 8806 FRONT SURROUND SURT O O NO IS 11 INT O OO 000 000 000 ID IRA DOOR Jammin E E TENIA S E A O E E ALUMA LUT A LTT LUT TUEUT TTT LETHE z o o Si o o o eae Aoures E Z anne Bae m A000000 Ta Sa UU TT CTT Jmm nF ir SI anaana E SPEAKERS FRONTA SO z PRE OUT SINGLE CENTER FRONT SURROUND SUR SUB BACK WOOFER Jimmi MM aii TTT AA o gt Line Level i Line Level input i input i Speaker Level Input I l l i l l l i l l l l l l l l l l l l l l l I l l l l l l l l I Left Right I l l I l l l l l l 4 qa gt a I l l P O l O O S E O I Y l O O O O i off On l l Auto I l l l l i i l i evel 5 l Min Max 90 S l O RoHS bi gt y CAUTION For continued Phase O comp UL as s CAUTION tection against risk l O RISK OF ELECTRIC SHOCK of fire SPOG 3 180 DO NOT OPEN with same type fuse l 0 S and rating 80 fusible de rechange de I 60 100 O meme type et calbre sf n Line Level O O 1 input y Ns I 40 120 m i e e a S a a a a ZN Crossover On Speaker Level Input Lee AC 2 i Frequency B 0 O O yess Variable Crossover Off BASH A 120 OWNER S MANUAL 7
11. emands if the woofer is placed at a primary node Placing a subwoofer s close to the listening position can also create more tactile sensation m Bass frequencies below about 80Hz are considered to be omnidirectional and tend to have no localization That is to say that it is difficult to determine their place of origin For this reason placement of most subwoofers is not limited to the front of the room However in practice this is not always the case There are cues such as tactile and audible vibration and higher frequency signal content that can suggest the direction of the source For this reason it may be desirable to locate the subwoofer s at the front of the room It may also be necessary to reduce the crossover frequency below 80Hz if one finds that the bass sounds too detached from the other sound sources Placing a subwoofer s at the back of the room is also a consideration especially if placement of a subwoofer at the front of the room is not suitable or produces poor results Placement directly behind or beside the listening position can produce very good results as well as corner loading in the back of the room Other options include placing the subwoofer s on the side s of the room especially when multiple woofers are used If possible experiment with different positions Don t exclude the possibilities of locating your subwoofer in walls ceilings floors or underneath beside and behind furniture m Symmetrically or asymmetri
12. enclosure has 5 threaded inserts arranged to accept either pattern A 120 OWNER S MANUAL a O O O O P otf 6 On O Auto Level QO Min Max 90 O RoHS CAUTION For con tinued PAE E O 4 AA CAUTION Hage al hain of Tire replace only wi O RISK ai SHE a lo Hea ie ne 0 180 rating 80 EN ATTENTION ATTENTION Utillser un fusible de rechange de 60 100 O meme type et calbre O Line re pe 40 120 Crossover Frequency Bypass Variable 6 Crossover On Speaker Level Input ah m Off Le i Co 9 Q Power and Standby Mode I ndicator Off No Power Green On Red Standby 2 Auto Power Mode Switch Selects if amplifier power is signal activated On Signal Sensing Off Bypassed Amp ON 3 Level Control Adjusts output level of subwoofer 4 Phase Control Adjusts relative alignment of output signal with respect to the input 0 n Phase 180 0ut of Phase 5 Crossover Frequency Control Adjusts low pass filter cutoff frequency 6 Crossover Bypass Switch Selects if internal crossover low pass filter is active Variable Active Bypass Inactive 7 Line Level I nput Input connection for RCA Line Level signals from processor or preamp Includes LFE amp Sub signals Speaker Level I nput Input connection for High Level signals from amplifier 9 Power I nput Receptacle and Fuse Holder IEC 2 conductor 120V receptacle accepts supplied IEC power cord Master Main Power Switch Primar
13. ent tire rr 8 A 120 o Cee te ee ee err Teeter re eee ere ree eee eee re eee cee 9 Fine Tuning the Meio ee nooo oro oro EO ee ee ee ee rr rr 9 1 O SPECI EI CATION Srrvvcceveccccseeseccceeeeectececececcrseececceserseececeustseseceveutrsseeeesetseseseesttseeesensntseeesensneeeeesens 10 E AAA tne earner UI AA toda datieucsneoneses 11 YOUR A 120 POWERED SUBWOOFER Thank you for purchasing the A 120 powered subwoofer Your subwoofer has been developed to provide you with pleasing accurate bass in your music system or home theater sound system This manual covers operating procedures general setup and technical specifications for your A 120 We recommend that you thoroughly read through the material contained in this manual before connecting your Subwoofer This will ensure that you have a complete understanding of how to setup and operate your Subwoofer properly for optimum performance Thank you again for choosing the A 120 and we hope that you enjoy the enhanced dimension that a fine subwoofer adds to the sonic experience Box Contents Subwoofer 4 Spiked Feet 4 Knurled Lock Nuts 4 Rubber Feet Power Cord Manual amp Warranty Card A 120 OWNER S MANUAL EM ATTACHING THE FEET After reviewing the manual and unpacking your A 120 subwoofer we suggest that the four rubber feet be installed on the bottom of the enclosure to protect the subwoofer and your floor or cabinetry from damage during installation and setup These feet can
14. or objects have fallen into the apparatus the apparatus has been exposed to rain or moisture does not operate normally or has been dropped WARNING To reduce the risk of fire or electric shock this apparatus should not be exposed to rain or mois ture and objects filled with liquids such as vases should not be placed on this apparatus To completely disconnect this equipment from the mains disconnect the power supply cord plug from the receptacle The mains plug of the power supply cord shall remain readily operable CAUTION The lightning flash with arrowhead The exclamation point within an equilat symbol within an equilateral triangle is intended eral triangle is intended to alert the user to the to alert the user to the presence of uninsulated presence of important operating and maintenance dangerous voltage within the product s en servicing instructions in the literature accompa closure that may be of sufficient magnitude to nying the product constitute a risk of electric shock to persons A 120 OWNER S MANUAL 2 A 1 2 O OWNER S MANUAL HON TE Nas IMPORTANT SAFETY INSTRUCTIONS YOUR A 120 POWERED SUBWOOFER pei AE A as 2 ATTACHING THE FEET ES PEA E TE S E re A A ee E eee E E E des 4 FEATURES DES AA E E ARAS AAA AAA RA AAA AA IA AA IR E E E Re E A bore E AAA 4 5 CONNECTION AA A E E RARA E E E E ER E E E E Ain SETUP Lb Ch RRG Rade Ud ET E E yaw eS Sa Sy SaaS OAS ONER A AA B 10 Placem
15. propriate for your installation If no line level output signal is available then the subwoofer should be connected in parallel with the main speakers per the Option 1 drawing A description is provided below m Per the Option 1 drawing on the adjacent page use two 2 condcutor speaker cables and connect the left and right front speaker outputs of your receiver or amplifier to the Speaker Level inputs of the A 120 as you would connect a pair of speakers Use care to ensure that the proper polarity is observed R is connected to R of A 120 R is connected to R of A 120 etc Failure to do so will result in little to no subwoofer output or erratic output O If a B speaker output is available unutilized it can be used in place of making a parallel connection at the receiver but this will only work if the amplifier utilizes an internal parallel connection of the A and B speaker pairs Use the following test to determine if this is the case Test for Parallel A and B connection Ensure that a pair of speakers is connected to the A output and that nothing is connected to the B speakers Engage the B speaker button while an audio source is playing through the A speakers If the A speakers continue to play then the connections are parallel and you may use the B output for the subwoofer If the A speakers discontinue playing when the B button is engaged then you will need to connect the subwoofer in parallel to the A speaker
16. udio reproduction Equalization cannot simultaneously compensate for all locations within a room However physical elements within or at the room s boundaries can effectively improve the room s behavior Subwoofer placement also has an effect on the excitation of the resonant modes and the way they are experienced Contacting an expert in the field of acoustics can be worthwhile if one finds that the low frequency reproduction in their room is unsatisfactory or if one wants assistance in optimizing their installation Placing a subwoofer on the floor near a wall will increase its radiating power by as much as 2X Placing a subwoofer on the floor near the intersection of two walls a corner will increase its radiating power by as much as 4X Corner loading as it is sometimes called is an excellent way to get bass extension and greater acoustic output from a subwoofer especially at very low frequencies m n the same way that the subwoofer s output is augmented by a corner the listening position can also have a Significant effect on how the bass is experienced Sitting at a room s boundary such as near the back wall of a room will significantly increase the bass level across much of the low frequency spectrum m Placing a subwoofer close to the listening position less than 5ft 1 5m can increase the intensity of the transients and reduce the acoustic power demands from the subwoofer in some installations In others it can increase the power d
17. y power On Power Enabled OFF Power disconnected from amplifier circuit CONNECTION _ No signal connection cable is provided with the A 120 subwoofer since the type and length of cable is installation specific A shielded RCA type coaxial cable a shielded two conductor wire with RCA type connectors or a 2 channel speaker cable is required for connection of the A 120 to the audio system Ensure sufficient length to reach from the system source to the subwoofer s line or speaker level input If you are uncertain about the type and length of wire to purchase after reading this section and the section on Placement then please contact your dealer for assistance Ed Patent 15 075 634 an 5 510 753 Patent Before making any connections ensure that power cord is disconnected or that the main power switch is switched to the off position Input Signal Follow the diagram on page 7 for connecting the subwoofer to your audio system Use the option that best suits your installation WARNING Use only one of the three options Do Not Combine Options The information below will aid in determining which option to use Note The best performance can be achieved using the line level inputs LATINA or CAINE as opposed to the speaker level inputs AINA A 120 OWNER S MANUAL EX CONNEC Pie continued _ OPTION 1 If a Line Level signal Stereo Left Right LFE Sub Out etc is available then skip to options 2 and 3 to see if they are more ap
Download Pdf Manuals
Related Search