Soundstream Technologies 405 Stereo Amplifier User Manual
Contents
1. Miro Ty i Aeyeg esny ONOW j O3Y31S a nm Y 35 PJE IAC 2 ACoX i A wit ieee AV AE E ar AS ii E TT I oO i OI NON J O382315 AIZ ffi j AYME PEA MOLA WOROG SOVNOOIENY ae ia eee eae A mm ONOW TJ 0321318 AWM il AWM ar e MBIA WOROG ssed Ma ul auueyo JajOOM qn cog uo pabebua siseyduwe 9p lly 1291 ssed yb Kem z jo sjeuueyo p sseq pana JUB SUOD YIM ape AS Ane indu jo sauueya y SO8NOOISNY we e m a PP e e o o o a ae euwog Kwea ooo o aira OOO E r Aepeg Ho ape esny puna sisseyy OL i uoun moway Of E eee a a e ON o Ar ONOS a 20909 a DOOD Ge WEE qiwi BO 000 0 2 ONOM T O3YILS AWMZ TP AWM E onon UT O343LS Avmz T AWE MBA WoRog PEHO SSBC MOJ uj aUUeYO JeJOOMQNS sseq pjuu sjeuuueyo z ebuespiuu ssed yy sjouueyo Z Burpy Jajoomqns 0 ayjazes um uonesado euueyo g pow Ken g Indui jo S euueyo y ATINO 508 WILSAS JTdNVS maA doi a Xx yun PLeH 81 puna l Aeneg zd E ri apeg ap esny ea Y TINNVHO de Z b TINNVHO ae Se ME ee ee ot en pl DS SD ASSO i a TaD AN SZ E CG AOS L gt 2 Y O DOC a O oA hee C DO z e J SA Ja CO a ay ade we aie a e E e ES EEE ET 2 l E Soy ES S tre a e Ye z E IR IN TI O SXERKI KEE S TAI2. TE inte Lee PROBLEM CAUSE OF R A E a DUE 2 Se POE ee ee SOUND V T 1 No power or ground at the amp be Sound and power LED is not 2 No remote tum on signal 3 Blown fuse near the battery 1 No signal inout 2 The AIRBASS Accessory switch is in the IN position Move it to the OUT position No sound power LED is lit 1 Speaker output may be shorted to ground Check for resistivity Amplifier output cuts off and on with an Ohm meter repeatedly 2 Speaker leads may be shorted to each other Check for continuity with an Ohm meter Repeatedly blow amp fuse 1 Speaker or leads may be frequert activation of Smart Power shorted Supply Circuit 2 Verify adequate amp ventilation The power supply fuses on the Fuse LED is lit bottom of the amplifier are blown SERVICE Your Soundstream RUBICON amplifier is protected by a limited warranty Please read the enclosed warranty card for details SPECIFICATIONS Channels 1 amp 82 38 amp 4 4 Q Stereo 2 Q stereo 8 2 Bridged 4 Q Bridged 12 5 Vdc 14 4 Vdc 50W x 4 100W x 2 MODEL Subwoofer Channel 4Q 220 10 move 12 5 Vde 14 4 Vdc 14 4 Vdc 405 100W x 1 150W x 1 200W x 1 805 200W x 1 300W x 1 400W x 1 THD lt 0 1 Signal to Noise gt 100 dB Frequency Response 20 Hz to 20 kHz 0 5 dB Stereo Separation gt 90 dB Damping gt 200 Input Sensitivity 300 mV to 5 0 Volts Input Impedance 10k Ohm
3. Speaker Connection Terminal Speaker connections for Ch s 1 amp 2 Inputs Right and left channel RCA inputs for the subwoofer channel Input Level Subwoofer channels input level control Low Pass Filter Control Adjustment Subwoofer Channel crossover fre quency control for the internal low pass filter Hawkins Bass Control Boost Adjustment Varies from O to 9dB of boost when the Hawkins Bass Control is engaged Speaker Connection Terminal Speaker connections for Subwoofer Chan nel REMOTE Remote turn on input from the head unit Accepts 12V GND Main ground connection Bolt to a clean chassis point in the vehicle 12V Connected to a fuse or circuit breaker then to the battery s positive terminal Main Fuse Main power supply fuses Stereo Mono Switch Channels 1 amp 2 Select MONO for bridged mono output in 3 channel operation use right RCA input only Select STEREO for stereo output in 5 channel operation Stereo Mono Switch Channels 3 amp 4 Select MONO for bridged mono output in 3 channel operation use right RCA input only Select STEREO for stereo output in 5 channel operation 7 e MONO Maria m STEREO POS TOUS gt AS oe z Voo e ES 4 N A dr Ou PN AS Y Bi Ras I oot TN IN A os A al N y ra a J O 4 PS AAS A NS aN e K JWAY eo Via
4. x fon ca ie SP 3 way LI 2 way IDO BTC 7 La Keo Wii SUA CEANNE OQ d Cte S A ZA GS 4 mm u Jan o NY SOUND TFN yy Y MAXEFUSE A KO RUBIO N 805 lO Il 12 13 14 15 16 17 18 19 20 21 22 29 30 31 KEY TO CALLOUTS Power LED Indicates amplifier power Subsonic Hawkins Bass Control Switch Select SUB SONIC to engage the Sub Sonic filter at 13 Hz Select HAWKINS BASS CONTROL to engage the subwoofer channel s high pass filter 45 Hz with variable Q for optimum bass Low Pass XOVER Switch Subwoofer Channel Select IN for use with the internal crossover or OUT for use with external crossover Subwoofer Channel Input Select Selectable inputs from internal CH 1 4 or ex ternal SUB local RCA inputs Mid Bass Midrange Select Selectable mid bass or midrange frequency control in 3 way operation High Pass XOVER Switch Channels 1 amp 2 Select IN for use with the internal crossover or OUT for use with external crossover High Pass XOVER Switch Channels 3 amp 4 Select IN for use with the internal crossover or OUT for use with external crossover Rear Fill De emphasis Switch Channels 3 amp 4 Select IN to activate 6 dB Octave filter 7 kHz Channels 3 amp 4 Input Select Selectable inputs from internal CH 1 amp 2 or ext
5. SOUNDS REA T E G E S RUBICON 805 405 5 3 Channel Power Amplifiers Owner s Manual SOUNDS I KREAM and T E HN 0o L 0 GIES Installation Guide SOAPS REAN nao Tax rev A 6 9 98 Congratulations You now own the Soundstream RUBICON amplifier the product of an uncompromising design and engineering philosophy Your Soundstream RUBICON amplifier will outperform any other amplifier in the world To maximize the performance of your system we recommend that you thoroughly acquaint yourself with its capabilites and features Please retain this manual and your sales receipt for future reference Soundstream amplifiers are the result of American innovation and craftmanship with the highest quality control standards When properly installed they will provide you with many years of listening pleasure Should your amplifier ever need service or replacement due to theft please record the following information which will help protect your investment Model and Serial Dealers Name Date of Purchase Installation Shop Installation Date CAUTION Prolonged listening at high levels may result in hearing loss Even though your new Soundstream Rubicon amplifier sounds better than anything you ve ever heard exercise caution to prevent hearing damage Table of Contents Design Features omiten diendo clanos Rubicon405 Amplifier Diagram oocooccnnooonnoooo Rubicon805 Amplifier Diagram ccooo
6. T 1D EIACeX MEM 250 AT ETA D X LESS MBIA wopog O A ee ee lt x os SS YN VW Q Mme woog SOVNOOIENY _ meee eel eee eee ee a A a A A A A A A ia A AA AX A gt a aaiae A AA A E ATAN AX S i G O ee o i i 7 oa A mens ESA a qa tae ieee E O Er ga pene ts z tki aw tts E Zi Ei TEC o G a Et No a o ARE Mel dol E _ ONON El 038318 ONOW N E oaas AWM Tl AYME AWM ii AYME ATA poe N a N menos SOBNODIGNS j a ae rat See PEHO 294HO TRIDENT PROTECTION CIRCUITRY 4 channels bf input 3 me odo 7 Your RUBICON405 amp 805 amplifiers are protected against both overheating and 5 channel operation with satellite to subwoofer fading short circuits by ee of main power fuses and the following circuits 2 channels high pass tweeters 2 channnels midrange Y Speaker Protection subwoofer channel in low pass Smart Power Supply Thermal Rollback AA fail safe thermal protection circuit _ NOTE If you experience blown main power supply fuses it is likely that the amplifier is seeing a dead short either in the speaker wire or in the speaker itself Rectify the problem before blowing multiple a HE O fuses DO NOT increase values beyond the original fuse value uel Doing so will void your warranty and may damage your amplifer See e si oo Soe aoe TROUBLESHOOTING Top View a TE Eo o a E kusrongo
7. able from 30 Hz to 120 Hz 805 only 12 dB Octave 3 way crossover which can be selected for mid bass 65 to 500 Hz or midrange 65 to 4 000 Hz operation Rear Channel De Emphasis 805 only A circuit based on theater surround technology in which rear fill information is rolled off with a 3 dB point at 7 000 Hz following with a 6 dB Octave slope to provide a more realistic listening experience in 5 channel mode only Flexible Dual Input Level Control allows 300 mV to 5 V input sensi tivity Symmetrical Discrete Balanced Class A Drive Boards Auto ad just for linear performance while driving low impedance loads Removable Front Spoiler allows for stealth installation of RCA Bal anced Line Speaker and Power wiring ri O O O O O 9 O 5 1738 a 4 5 JAF Q E O 9 0 o 80 gt o 0093 aa 1 O N Top View RIGH INPUT VOLI 10 Ds 2 enganen 4 P X OVER LEVEL 4 H INPUT LODO VOL 0 4 En 220 5 HP He 5 9 O L90 X OVER LEVEL Da as Zz O 6 2 50 os TEN as Y No Lie SE x lt m 29 A L e 50 179 Ao CD TE 0 Front View 6 S NNELj 1 Prades SUB 10 12 dB Q nr oc Bottom View STEREO MONO STEREO MONO 22 24 25 26 27 KEY TOCALLOUTS Fuse LED Indicates blown power supply fuses when lit Power LED I
8. dio components the RUBICON amplifier must be fused near the battery A fuse or circuit breaker must be located within 18 of the battery This will prevent a fire in the event of a shorted cable See the chart below to determine the correct fuse value INTERNAL The RUBICON405 amplifier is fused with two automotive type fuses and the RUBICON805 is fused with a single Maxi Fuse In the event of blown power sup ply fuses replace with the correct value fuse found in the chart below Never replace the fuse with a higher value than what is supplied This may result in amplifier damage and will void the warranty RUBICON405 amp 805 Amplifier Fuse Values SF Amplifier Fuse Battery Fuse Circuit Breaker RUBICON405 2 20 amp automotive 50 amp RUBICON805 60 amp Maxi Fuse 80 amp REMOTE TURN ON Connect the Remote line to the turn on lead from the source unit When 12 Volts is received the amplifier will turn on SIGNAL CABLE Use a high quality cable that will be easy to install and has minimal signal loss to guarantee optimum performance SPEAKER CABLE The RUBICON amplifiers will accept up to 8 gauge speaker cable Use a high quality flexible multi strand cable for best performance and longevity 13 INSTALLATION STEP 3 INSTALLATION AND MOUNTING AMPLIFIER LOCA TION The RUBICON amplifier employs highly efficient circuitry a custom engineered heat sink and a unique Chassisink construction to maintain lowe
9. eard in the system FRONT SPOILER Once the amplifier is installed and the proper levels set place the front spoiler in position and secure it using the supplied hardware 15 ee eae Lb NAS uwa Aepeg yo Airo SF 7 wun peah O J E A Na z JA Or Cy N E Y EN XK eS he at T E ar A e Es me TLL al iy pas ae cece ones B i mp dl y E i ho F an Y ean A a hs eo punog e SISSBYDOL NN fee T3NNVHO 3 ro ebOe tor C CC s Y A r TN Oge 8 6508 Ye KE 2 00 OS gt i 7 y NI TES ge Ne e ae LI TA f ae oo x i Se mo X a SiN ACG a ae agar iS MOJA wonog pe ee Ee ee oe Fe AZ ONN S EE c0ee o 0000 n a 00 200 LW fi o ma T M eee MOA doj onon T O3YALS a AAA Poo SOYNOJ18NY MOYA WO Og me ee ee ii Te O X ee a a a eae a eae ener X Tas nas ass aT aaa aaa sae aes es eee pe N Y a ON m J so tenet ck E R t yeild bis v E 23538 ISS L OED BETES Pavers Ela cor S oe er ters shes ee ger a wi eames OD ee E i En E EZ E eee MASIA GOL ONOW J 039318 AWM AME zf ES A i g Y Menwonea SOBNODIENE A E A ae J ssed moj ul euueyo JOJOOMQNS sos uo pabe ue os 114 1231 ssed uly iene jo sipuueya p r Indu jo sjauueyo A E oF WIISAS TIAMVS uun Peo ON OW 3 O3Y3LS _ JEURLLUOL Aeneg
10. ernal CH 3 amp 4 local RCA inputs Inputs Right and left channel RCA inputs for channels 3 amp 4 Input Level Channels 3 amp 4 input level control High Pass Filter Control Adjustment Channels 3 amp 4 crossover frequency con trol for the internal high pass filter Speaker Connection Terminal Speaker connections for Ch s 3 amp 4 Inputs Right and left channel RCA inputs for channels 1 amp 2 Input Level Channels 1 amp 2 input level control High Pass Filter Control Adjustment Channels 1 amp 2 crossover frequency con trol for the internal high pass filter 3 way Filter Control Adjustment Channels 1 amp 2 3 way high pass crossover fre quency control and channels 3 amp 4 3 way low pass crossover frequency conirol Speaker Connection Terminal Speaker connections for Ch s 1 amp 2 Inputs Right and left channel RCA inputs for the subwoofer channel Input Level Subwoofer channels input level control Low Pass Filter Control Adjustment Subwoofer Channel crossover frequency control for the internal low pass filter Hawkins Bass Control Boost Adjustment Varies from 0 to 9 dB of boost when the Hawkins Bass Control is engaged Speaker Connection Terminal Speaker connections for Subwoofer Channel REMOTE Remote turn on input from the head unit Accepts 12V GND Main ground connection Bolt to a clean chassis point in the vehicle 12V Connected to a fuse or circuit breaker then to the battery s
11. ndicates amplifier power Low Pass XOVER Switch Subwoofer Channel Select IN for use with the internal crossover or OUT for use with external crossover Subsonic Hawkins Bass Control Switch Select SUB SONIC to engage the Sub Sonic filter at 13 Hz Select HAWKINS BASS CONTROL to engage the subwoofer channel s high pass filter 45 Hz with variable Q for optimum bass Subwoofer Channel Input Select Selectable inputs from internal CH 1 4 or external SUB local RCA inputs High Pass XOVER Switch Channels 1 amp 2 Select IN for use with the internal crossover or OUT for use with external crossover High Pass XOVER Switch Channels 3 amp 4 Select IN for use with the internal crossover or OUT for use with external crossover Channels 3 amp 4 Input Select Selectable inputs from internal CH 1 amp 2 or external CH 3 amp 4 local RCA inputs Inputs Right and left channel RCA inputs for channels 3 amp 4 Input Level Channels 3 amp 4 input level control High Pass Filter Control Adjustment Channels 3 amp 4 crossover frequency control for the internal high pass filter Speaker Connection Terminal Speaker connections for Ch s 3 amp 4 Inputs Right and left channel RCA inputs for channels 182 Input Level Channels 142 input level control High Pass Filter Control Adjustment Channels 1 amp 2 crossover frequency control for the internal high pass filter
12. ntly variable from 65 to 220 Hz at 12 dB Octave and the low pass crossover is independently variable from 30 to 120 Hz at 24 dB Octave For initial crossover setup try setting the low pass filter to approximately 60 Hz and the high pass filter to approximately 100 Hz Change the crossover points to accommodate a good mixture of frequency response power handling and per sonal preference 12 dB Octave High Pass 2 WAY 24 dB Octave Low Pass 3 WAY 805 ONLY MIDBASS MIDRANGE BAND PASS The RUBICON805 can be operated in midrange or midbass band pass con figuration In the three way mode you can tri amplify with active midbass or midrange to maximize control over individual drivers The bandpass includes a low pass and high pass filter which work independent of one another to drive the midrange or midbass speakers 12 d B Octave 12 dB Octave High Pass Low Pass High Pass 3 WAY 24 dB Octave Low Pass Hawkins Bass Control Theory and Use Hawkins Bass Control variable is a unique subwoofer con trol circuit included with the Soundstream RUBICON405 amp 805 amplifiers It is capable of removing subsonic energy in pro sue HAWKINS gram material below 45 Hz at 12 dB Octave while boosting SONIC CONTROL subwoofer frequencies The circuit consists of two controls One T engages a subsonic High Pass filter at 45 Hz and the other pee adjusts the amount of boost 0 to 9 dB CONTROL The Boost con
13. on f Re connect the fuse or circuit breaker POWER UP Power up the system and look at the Power LED there may be a 2 3 second delay from the time the source unit is turned on to the time that the LED on the amp turns on which is normal Once the amplifer LED is on and the source unit is playing you should have sound coming from the speakers 14 INSTALLATION STEP 4 LEVEL SETTING The input levels are adjusted by means of the input level controls located on the front of the amplifier This is a unique dual stage circuit that adjusts both level and gain This topology maintains better S N Ratio even when using sources with minimal output In the ideal situation all components in the audio system reach maximum undistorted output at the same time If you send a distorted signal to an amplifier it is simply going to amplify distorted information The same holds true if an outboard proces sor or crossover begins to distort before you have maximum output from the ampli fier By setting all components to reach clipping at the same time you can maxi mize the output of your system For the RUBICON amplifier follow these steps for setting the input levels 1 Turn the amplifier s input levels to minimum position counter clockwise 2 Set the source unit volume to approximately 3 4 of full volume 3 While playing dynamic source material slowly increase the amplifiers input level until a near maximum undistorted level is h
14. oonccinonnnnonannnnos Crossover Adjustments cccoooccccnnnccinoncccnnnnaancnnnnnnnnns Hawkins Bass Control Theory and Use Installation Speaker Output Modes ocooooooooo0s Installation Wiring 0 0 0 Installation Mounting densa Installation Level Setting and Front Spoiler Sample System Diagrams 0oooooccccocononinoninanananananccnos Protection Circuitry Service and Troublestlooting Spec Calo ssosrlir aora P 22 DESIGN FEATURES 0 RUBI Rapid Use Branched Impulse This new proprietary power supply topology eliminates power sags during low frequency repro duction by rapidly increasing the duty cycle stabilizing the power sup ply and allowing it to deliver the power required when reproducing low frequencies Also greater reserve gate power is stored for low volt age conditions that occur during extreme conditions STACT STabilized Apex Current Topology Reduces power sup ply stress by 50 Typical designs degrade the stereo image due to phase reversal of even order harmonic distortion that occurs between the inverted channels In the STACT design inversion is done at the power amplifier drive stage Since the fully symmetrical power ampli fier produces no even harmonic distortion itself and all preamplifier circuitry is run completely in phase no even harmonic distortion phase reversal occurs Trident Protection Topology provides three types of pro
15. positive terminal Main Fuse Main power supply fuse Stereo Mono Switch Channels 1 amp 2 Select MONO for bridged mono output in 3 channel operation use right RCA input only Select STEREO for stereo output in 5 channel operation 2 way 3 way Switch Channels 1 amp 2 Select 2 way for 2 way internal crossover Select 3 way for 3 way band pass internal crossover Stereo Mono Switch Channels 3 amp 4 Select MONO for bridged mono output in 3 channel operation use right RCA input only Select STEREO for stereo output in 5 channel operation 2 way 3 way Switch Channels 1 amp 2 Select 2 way for 2 way internal crossover Select 3 way for 3 way band pass internal crossover 9 CROSSOVER ADJUSTMENTS The RUBICON amplifiers incorporate an on board staggered electronic cross over with RCA outputs to drive an external amplifier No external electronic cross over is necessary However if you do desire to use an external crossover you still have the option The high and low pass portions of the crossover can be set independently of one another In many car audio installations there is a tendency for a midbass boom Be cause of their interior dimensions most cars will resonate or ring at these midbass frequencies If we design the system so there is reduced output in this region the final response is very smooth and natural sounding The high pass crossover is independe
16. r operating tem peratures Additional cooling may be required if the amplifier is located in a tightly confied area or when driving especially low impedance loads at extremely high levels When mounting the amplifier it should be securely mounted to either a panel in the vehicle or an amp board or rack that is securely mounted to the vehicle The mounting location should be either in the passenger compartment or in the trunk of the vehicle away from moisture stray or moving objects and major electrical com ponents To provide adequate ventilation mount the amplifier so that there are at least two inches of freely circulating air above and to the sides of it MOUNTING THE AMPLIFIER a Using the amplifier as a template mark the holes on the mounting surface b Remove the amplifier and drill the holes for the mounting screws C Secure the amplifier to the mounting surface using the supplied hardware WIRING a Run and connect the audio signal and remote turn on cables to the amplifier from the source unit b Carefully run the positive cable from the amplifier to a fuse or circuit breaker within 18 of the battery C Connect the fuse or circuit breaker lead to the battery Leave the circuit breaker off or the fuse out until everything is bolted down d Secure the ground cable to a solid chassis ground on the vehicle It may be necessary to sand paint down to raw metal for a good connection e Double check each and every connecti
17. s Crossover Specifications Low Pass 30 Hz 120 Hz at 24 dB Octave High Pass 65 Hz 220 Hz at 12 dB Octave Band Pass 805 65 Hz 500 Hz at 12 dB Octave Mid Bass 65 Hz 4 kHz at 12 dB Octave Mid Hawkins Bass Control 0 to 9dB Boost Boost Frequency 45 Hz Hawkins Bass Control IN Sub Sonic filter frequency 13 Hz Dimensions W x D x H RUBICON405 15 0 X 9 8 X 2 25 881 mm X 288mm X 57mm RUBICONS805 19 0 X 9 8 X 2 25 483mm X 288mm X 57mm 22 INSTALLATION NOTES AND DIAGRAMS 23
18. st Q control until you 10 Frequency Her 50 100 700 reach the desired level FIG 3 Limited Excursion With Soundstream s Hawkins Bass Control the boost and frequency control can provide the tailoring needed for any type of assisted design and any woofer in any type of installation INSTALLATION STEP 1 SELECTING THE SPEAKER OUTPUT MODE Channels 1 through 4 of the RUBICON405 amp 805 amplifiers have the ability to operate in any one of the following modes Stereo STACT Mixed Mono Use this mode for either stereo operation left and right channels or for Mixed Mono operation Bridged Mono Use this mode to get a bridged mono output while using only the right channel input for 3 channel operation Please follow the wiring schemes below for the correct operation f N l i ee ola ba E amp vono s BRIDGED MONO STEREO L R L R t Se ST MIXED MONO L R LT Sa Eat pe oo a a aa 12 INSTALLATION STEP 2 WIRING POWER AND GROUND To ensure Maximum output from your RUBICON amplifier use high quality low loss power and ground cables and connections The RUBICON amplifiers will accept up to 4 gauge power and ground cables Determine from the chart below the minimum gauge power and ground wire for your application RUBICON405 4 or 8 gauge 4 gauge only RUBICON805 4 or 8 gauge 4 gauge only CIRCUIT BREAKERS AND FUSES EXTERNAL Like all au
19. tection 1 Output protection against short circuits or improper loads 2 Ground fault detection Shuts down the amplifier when a significant voltage gt 5 Volts fluctuation occurs between electrical turn on lead and battery ground 3 Thermal Protection Puts the amplifier into thermal rollback or shuts the amplifier down in extreme thermal conditions Hawkins Bass Control provides a focused subwoofer boost O 9 dB at 45 Hz and routes otherwise wasted amplifier power back to the audible bandwidth Harmonic Bass Alignment The 2nd and 3rd order harmonic peaks are Critically aligned to fundamental peaks at low frequencies This produces tighter more accurate bass reproduction Drive Delay II Amplifier section powers up 2 to 3 seconds after the power supply eliminating turn on pops Turn off process is reversed Amplifier section turns off first followed by the power supply Dynamically Optimized Power Grid Power grid is evenly distrib uted between primary and secondary power supplies providing greater dynamics and improved FF filtering Chassisink All transistors are ideally located and sandwiched be tween the circuit board and the heatsink to provide cool efficient ampli fier operation Differentially Balance RCA Input eliminates ground loop related noise in the audio Continuously Variable Crossover Networks 12 dB Octave 2 way highpass variable from 65 to 220 Hz and 24 dB Octave lowpass cross overs vari
20. trol adjusts the amount of level applied at the O set frequency and is adjustable from O to 9 dB see figure 2 aB i When the boost is set to 0 Hawkins Bass Control acts as a sub El sonic filter only The simple act of removing potentially harmful FIG 1 low frequencies can improve system output by as much as 3 dB Application w Subwoofer drivers in general have excellent power handling characteristics over their operational bandwidth This bandwidth is de termined by many factors including driver 15 design and enclosure type It is possible to 20 overdrive any subwoofer driver by sending A powerful signals outside of its operational 1 Frewercy Ha bandwidth These potentially damaging sig FIG 2 VARIABLE BOOST nals can be removed by adding a subsonic filter Figure 3 shows the effectiveness of the Hawkins Bass Control on woofer excursion in a vented enclosure The woofer travels 7 5 mm at 10 Hz With Hawkins Bass Control properly adjusted this excursion can be reduced to less than 1 mm This is of great benefit to lowering woofer distortion and increasing output Adjustment An easy method of optimizing your existing subwoofer enclosure with Hawkin s Bass Control is as follows 1 Adjust the boost control to full counter 7o clock wise 0 position 60 0 2 Set the bass control switch to eo HAWKINS BASS CONTROL 20 3 Play moderate to loud bass material 4 Adjust the boo
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