Preference Audio P-1200 User's Manual
Contents
1. P 1200 OWNERS MANUAL na 300 Watt Powered Subwoofer 12 EXTRALONG THROW Heavy Duty Woofer FREE STANDING POWERED SUBWOOFER Prefer 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 inlcuding 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 has2. 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 P 1200 controls will allow you to make the best of virtually any installation If you feel uncomfortable with setting up your P 1200 after reading through this section then you should consider enlisting the help of an experienced person or contacting your dealer Below are a few generalized rules for understanding the acoustic nature of low frequency sound reproduction in an average residential listening room These rules will aid in understanding the best placement of and tuning of your P 1200 subwoofer If possible experiment with the placement of your P 1200 to determine what works best in your listening room m Virtually all rooms have significant resonant modes The listener will experience these resonant modes as an acoustic increase or decrease in intensity at certain frequencies These resonant modes are a result of reflected acoustic energy within the room interacting with other acoustic energy either reflected or direct These frequency dependent nodes or antinodes as they are called are different for every listening position within t
3. in determining which option to use Note The best performance can be achieved using the line level inputs LANA or TENE as opposed to the speaker level inputs RATE P 1200 OWNER S MANUAL 5 CONNEC Tien 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 appropriate 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 P 1200 as you would connect a pair of speakers Use care to ensure that the proper polarity is observed R is connected to R of P 1200 R is connected to R of P 1200 etc Failure to do so will result in little to no subwoofer output or erratic output D 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 t
4. ae e 5 7 SETUP iei ude e ca E EEE SE ET ata a ARA t E E E E E TE e OE AR AA AAA AAA 8 10 Placement cer rE EEE EEE EEE EEE EE EEE EEE EEE EERE EERE EEE TEETER EEE EEE EE EE EERE TEESE EEE EEE EEE EEE EEE nana nenea 8 P 1200 Controls n cn cane eee eee seen eee enue seb eh enes oua mean aa au NEw ONS eds eased HEN ONES E SE revene enn eneren aaa sas 9 Fine Tuning the Controls 00000000nnannennenunnunnnnnnesnennnennennennennennenneenennennennnennennennenenenenneenennnennnnnnnner 9 7 O SPECIFICATIONS AA AURA Te EEE ESTE ER AREA Ad AA en a EE EEE 10 NOTES E PRE A ES AR ee ENDE RAR AA RRA eee ee Leen ee eee ee ee a le ATRAEN AA AAA 11 YOUR P 1200 POWERED SUBWOOFER ll Thank you for purchasing the P 1200 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 P 1200 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 P 1200 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 Manu
5. al P 1200 OWNER S MANUAL EM ATTACHING THE FEET After reviewing the manual and unpacking your P 1200 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 be replaced by the spikes or removed if desired after the final location is determined Here are some guidelines for using the feet m DO NOT try to slide your subwoofer with the feet installed This will damage the foot supports or the feet m If the P 1200 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 If the unit is placed on a hard surface then the rubber feet should be used m 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 P 1200 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
6. 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 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 P 1200 OWNER S MANUAL 2 P B 1 2 OO OWNERS MANUAL HON TE Nas IMPORTANT SAFETY INSTRUCTIONS EEE SEE a tal d eee EE acei a te ME 2 YOUR P 1200 POWERED SUBWOOFER RAN 2 ATTACHING THE PEE A saa TEn resu dia a EEEE SEENE EESE e nt dl 4 FEATURES AA A RA ca E arti d E i al E AS A A it a und is iad i AR E E E EEE E E at E aa ls EE 4 5 CONNECTION iata a a aia ct al EE a ae A E ea i eee ee E E E e a ee
7. d forth across its range and listen for the localization of the bass to become more distinct and also slightly louder While making this adjustment it is helpful to temporarily adjust the Frequency control to 120Hz This should provide some overlap of the satellite and subwoofer frequencies and help the ears brain to distinguish the two sound sources Return the Frequency control back to its desired position after performing the phase adjustment P 1200 OWNER S MANUAL EN SETUP continued Fine Tuning the Controls Crossover Switch continued 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 manufacture of your electronics in conjunction with the Level and Phase controls on the P 1200 Note the Level and Phase adjustments on the P 1200 are not bypassed and will still function as indicated above To bypass the internal crossover move the Crossover switch to the Bypass position The subwoofer will now pass signals up to approximately 300Hz Auto Power Mode Switch The P 1200 contains a circuit that automatically powers up the amplifier when a signal is detected The same circuit also places the P 1200 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 switc
8. duces the noise floor of the entire audio system m The P 1200 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 enclosure has 5 threaded inserts arranged to accept either pattern P 1200 OWNER S MANUAL EN O O O O O otf 6 on 2 Auto Level E Min Max 90 RoHS Phase P CAUTION F tinued O compliant CAUTION protection aE E O O RISK OF ELECTRIC SHOCK of fire replace only with 180 DO NOT OPEN same type fuse and 0 rating 80 E ATTENTION ATTENTION Utillser un fusible de rechange de 60 100 O meme type et calbre O O O Line ea gh a 40 120 REN Crossover Speaker Level Input Len o Frequency O SZ Bypass Variable O Y Right o Crossover Y Q U S Patent 5 075 634 and 5 910 753 Patent Pending Q 9 8 Q O Power and Standby Mode Indicator 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 In Phase 180 Out of Phase 5 Crossover Frequency Control Adjusts low pass filter cutoff frequency 6 Crossover Bypass Switch Selects if internal cr
9. h 2 to the OFF position if it is preferable to control the P 1200 s power with a remotely operated power source SPECIFICATION m Frequency Response m Crossover Frequency m Phase Adjustment m Amplifier Output Power m Audio Inputs E Input Impedance a Input Power Input Power Connection m Power Mains Fuse m Power Modes Auto Off Delay m Dimensions m Weight a Shipping Dimensions a Shipping Weight 28Hz 300Hz System Response 40Hz 120Hz Low pass filter with bypass switch 0 180 degrees Continuously variable 300 watts with thermal and clipping limiters Summing stereo line level RCA x2 LFE RCA shared with Left input connector Speaker level Stereo 5 way binding post Line Level 20kohms Unbalanced Speaker Level 220 ohms 120V 60Hz AC IEC 2 wire receptacle with integral fuse holder 3A 250V GMA style Fast Blow Auto signal sensing and always on 10 minutes 15 3 8 W x 17 5 16 H x 14 3 4 D 390W x 440H x 375D mm without feet 43lbs 19 5kg 21 W x 20 H x 20 D 533W x 508H x 508D mm 51lbs 23 2kg P 1200 OWNER S MANUAL 10 NOTES P 1200 OWNER S MANUAL n E mam GN OEM SYSTEMS Sparks Nevada e 775 355 0405 www oemsystems com info
10. he room Equalization cannot simultaneously compensate for all locations within a room Only physical elements within or at the room s boundaries can effectively alter the room s behavior These resonant modes can produce large errors in the frequency response and reduce the overall enjoyment of the audio reproduction Subwoofer placement has some effect on the location of the resonant modes One Should contact an expert in the field of acoustics if one finds that the low frequency reproduction in their room is unsatisfactory m Placing the subwoofer near a wall will substantially increase its effective radiating power especially at very low frequencies Placing the subwoofer near the intersection of two walls a corner will substantially increase it even more Corner loading as it is called is an excellent way to get bass extension and greater acoustic output from your subwoofer and can increase the listening pleasure m Placing the subwoofer close to the listening sitting position will increase the intensity of the transients and reduce the acoustic power demands from the subwoofer The listener will hear more direct sound from the subwoofer and less reflected sound m Bass frequencies are generally 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 thi
11. input of the P 1200 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 P 1200 OWNER S MANUAL 6 CONNECTION continued II QUE ee 0000 000 9006 0000 000 0000 Tne A e a Se RRR e mE A E E UE Ba Ne 500000 a 00000000 Z E SUE e i iin a d Maat E SPEAKERS FRONTA in Cind it cea PRE OUT SINGLE CENTER FRONT SURROUND SUR SUB BACK WOOFER IS IS DUILIU TEED TTT NA x Line Level Line Level h o Me i input 1 I I I I I I I I OPTION 3 O O I Y I O O y l I l I I I I l l l l Level S S Min Max 90 N O RoH S N CAUTION For continued pass O compliant CAUTION protection against risk f fire repl I O N x Seo OF ELECTRIC SHOCK PASE EAI l o 180 and rating 80 N o N ATEN ON ATTENTION Utillser un l fusible de rechange de 60 100 meme type et calbre Pi O DNS x O O Line bevel N i 40 120 a So a a a m Y Crossover On Speaker Level Input N i Frequency O 6 6 6 6 a Variable i Crossover Off P 1200 OWNER S MANUAL 7 SETUP yz Placement There are a number of
12. o 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 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 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 P 1200 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
13. ontrol 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 Fine Tuning the Controls We recommend the following method as a starting point for fine tuning the P 1200 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 B Play some familiar music through the system music with robust bass content and increase the Level control until the bass passages sound robust or 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 To adjust the Phase use music with sustained bass notes B Rotate the Phase control back an
14. ossover low pass filter is active Variable Active Bypass Inactive 7 Line Level Input Input connection for RCA Line Level signals from processor or preamp Includes LFE Sub signals Speaker Level Input Input connection for High Level signals from amplifier 9 Power Input Receptacle and Fuse Holder IEC 2 conductor 120V receptacle accepts supplied IEC power cord Master Main Power Switch Primary power On Power Enabled OFF Power disconnected from amplifier circuit CONNECTION lt lt No signal connection cable is provided with the P 1200 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 P 1200 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 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
15. s is not the case There are cues such as tactile vibration and higher frequency signal components that can suggest the direction of the source For this reason it may be desirable to locate the subwoofer at the front of the room near the main speakers It may also be necessary to reduce the crossover frequency if one finds that the bass sounds too detached from the other sound sources m If placement of the woofer at the front of the room is not an option consider placing the subwoofer at the back of the room Placement directly behind the listening position can produce very good results as well as corner loading in the back of the room m Using multiple woofers at opposite corners of the room can be done to balance the localization of the sound m It is not necessary to direct the front of the subwoofer at the listening position m The vent at the back of the enclosure must not be blocked It is advisable to leave at least 3 to 6 inches of space behind the vent If necessary turn the cabinet so that the back of the subwoofer does not back up directly to a wall P 1200 OWNER S MANUAL EN eee UP i continued P 1200 Controls The P 1200 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 c
16. 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 Feet o O vo FEATURES m The P 1200 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 m The P 1200 integral amplifier incorporates a defeatable signal sensing circuit that automatically powers up the amplifier when a signal is detected m A double insulated isolated ground electrical supply prevents electrical ground loops and re
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