Dayton Audio SPA250 User Manual
Contents
1. Advanced soft clip circuitry improves headroom and program material protects woofers e Full complement of protection circuits for extreme reliability e Switchable 115 230V input voltage e Switchable bass boost e Complies with Energy Star and CE EuP directive Bass Boost Off On HIGH LEVEL IN OUT CE FROM AMPLIFIER TO SPEAKERS Oo CAUTI TO REDUCE THE RRS RE ELECTRIC SHOCK DO NOT REMOVE COVER OR BACK Ni ISER SERVICEABLE PARTS INSIDE REFER SERVICING a GUALIFIED SERVICE PERSONNEL CAUTION x D 115V 60Hz T5AL 230V 50Hz T2 5AL NOT SUITABLE FOR IN WALL MOUNTING ol C oui eas To 400 WATTS O uL s1 60065 O WARNING SHOCK HAZARD DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR m The trade mark is shown on the rear plastic housing near the speaker wire INPUT OUTPUT CONNECTIONS 1 Low Level Inputs Left Right RCA style jacks that will accept standard line level inputs from a pre amp level source They will accept a stereo signal and internally combine it into mono Both left and right input jacks must be connected to the source in order to drive the amplifier to full output Note If using a LFE output from a preamp or receiver connect it to the Left mono input 2 Low Level Outputs Left Right This output allows the low level input signal to be daisy chained to other amplifiers The low level input is simply passed through with2. AC electri cal socket Do not defeat the safety purpose of the polarized or grounding plug If the provided plug does not fit into your outlet consult an electrician for replacement of the obsolete outlet Refer servicing to qualified personnel To reduce the risk of fire and shock do not expose unit to rain or moisture Clean only with dry cloth Unplug the unit during lightning storms or when unused for long periods of time The unit should be operated in a well ventilated area Minimum clearance is 2 inches from the ventilation openings Do not install near any heat sources such as radiators heat registers stoves or other apparatus including amplifiers that produce heat Protect the power cord from being walked on or pinched particularly at the plugs convenience receptacles and at the point where they exit the unit Only use attachments accessories specified by the manufacturer CAUTION RISK OF ELECTRICAL SHOCK DO NOT OPEN WARNING SHOCK HAZARD DO NOT OPEN AVIS RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR Note Unit is set at the factory for 115V operation Be sure to change the fuse to a 2 5A rating before switching to 230V operation Warranty Information Dayton Audio products are constructed by industry experts and are thoroughly tested before shipment Dayton Audio products are warranted for the period of one year This warranty is limited to manufacturer defects either in materials or workmanship Dayton Audio is not responsible f
3. recommend that the user spend a moment or two determining the best balance between the two controls When a balance is found between low noise linear level control and sufficient level to drive the amp to the required output the gain knob can be considered to be the volume control for the subwoofer system 7 Frequency This control is used to establish the highest frequency that the subwoofer will reproduce and has a range between 40 to 180 Hz with a slope of 24 dB per octave If you are using the system for music and your main speakers have good bass capability you could set the control to a fairly low value at 40 60 or even 100 Hz If the main speakers are smaller or do not have much bass output set the control higher Experiment with the amount of overlap that you will experience when all speakers are playing in the same range This can be helpful when integrating the subwoofer with the rest of the system and with the room Note When using the amp with a LFE Low Frequency Effects output on a pre amp or home theatre re ceiver the internal low pass filter circuitry should be bypassed by turning the frequency control to maximum 180Hz The home theater receiver should be used to control the low pass crossover frequency 8 Power LED When the power switch is moved to the on position the LED will illuminate green and the amp will be in On mode When set in the Auto position the unit will be in the st
4. the user to select 115V or 230V operation The unit is set at the factory for 115V operation and contains a 5A 250V fuse When operating at 230V be sure to change the fuse to a 2 5A 250V fuse 12 Output Lead for Subwoofer Driver This rear mounted output lead connects the amplifier to the subwoofer driver The output lead is roughly 20 long and is color coded The red wire uses an insulated 250 quick disconnect and the black wire uses an insulated 205 quick disconnect These connectors can be easily removed if your driver requires another size or type of connector Be sure to observe proper polarity when connecting the amplifier to your subwoofer driver red positive black negative 13 Bass Boost Selects a bass boost filter with 6dB 35Hz Allows the user to add boost to the low end response Remove plug to access switch NOTE DO NOT attempt to change bass boost set ting when ampliifier is turned on NOTES ABOUT HUM While the SPA250 has been designed to minimize the possibility of hum in the subwoofer system it is still possible that a hum will occur in rare circumstances Its safety grounding can create a path for small amounts of 60 Hz energy to travel through the line level audio system Although not dangerous this energy can cause difficulty with the subwoofer auto signal sensing circuit and at the very least will interfere with the quiet enjoyment of your system The first course of action should be trying to make
5. and by mode In this position if a low level signal of about 10 millivolts or greater is applied to the input the light will change green to indicate that the amplifier is fully operational and receiving typical music program If an input signal is not detected for 10 to 15 minutes the amp will go back to stand by mode and the LED will turn off If the protection circuit detects a short circuit or thermal overload the unit will shut down and the LED will turn red 9 Power Switch On Off and Auto mode When the Auto position is selected the amp is in stand by mode until an input signal of about 10 millivolts or greater is detected The amp will go back to standby mode 10 15 minutes after the input signal stops 10 Phase This two position NOR 0 phase and REV 180 phase switch helps to compensate for differences in the acoustical and electrical characteristics between the subwoofer and the main system speakers The relative locations of speakers in the system can cause significant disturbances in speaker interaction due to time delay issues or the destructive phase interferences that can occur at certain frequencies The use of this switch in conjunction with altering the location of the subwoofer can have a dramatic effect on system integration The NOR setting would be considered the normal or default setting but be sure to experiment during system set up 11 Voltage Selector Switch This switch allows
6. no alteration EQ to the original signal 3 High Level Inputs Speaker level inputs using binding post type jacks to permit connection with banana type plugs or spade terminals Allows the user to connect the speaker level output of a full range amplifier to the input of the subwoofer amp using standard speaker wire A mono signal is derived from the stereo which then feeds the subwoofer amplifier crossover input 4 High Level Outputs Speaker level outputs using binding post type jacks to permit connection with banana type plugs or bare wire Used to con nect from the subwoofer amp to pass signal from the full range amp on to the main L R speakers Signal is only present on this output if the high level input is also used The signal to the L R speakers will be shaped by an internal 6 dB octave 125 Hz high pass filter 5 Power Input This unit features an IEC type power jack This allows the user to change the power cord depending on the country and volt age used The IEC jack also houses an integrated fuse holder that contains the AC line fuse The unit is set at the factory for 115V operation It is supplied with a 5 A 250V fuse and USA type power cord In most 230V applications a separate power cord and 2 5A 250V fuse will be required and are not included CONTROLS INDICATORS 6 Gain This control will match the amplifiers input sensitivity to the output of the pre amp source If the source output has a vari able control we
7. o SPA250 DATONAUD A e Model SPA250 User Manual a 4 LLI U m u z Lf Q PLATE AMPLIFIER PWRIPRT ie Toor oN OFI D au PHASE D LOW LEVEL OUTPUT INPUT MONO HOF LAN WENN Ome MENNE eN N A NE HIGH LEVEL IN OUT FIER Tos OM ANE NAN WS 1 NT 0 WIS Thank you for purchasing the Dayton Audio SPA250 Subwoofer Amplifier It has been designed and built to provide years of high quality sound reproduction and is ideal for use in both home stereo and home theatre systems The am plifier has been engineered to include features like a choice of high or low level audio connections selectable crossover frequency auto on off circuit activated by input signal and comprehensive internal production against shorted speaker loads thermal faults and overload conditions FEATURES e Line level and speaker level inputs for connection to e Reversible phase switch for best integration with satellites any system e Variable frequency 4th order low pass crossover for a e Auto on circuit comes on the instant the amp is needed clean transition to main speakers e Soft clip circuitry provides clean output even with demanding
8. or any con sequential on inconsequential damage to any other unit or component or the cost for installation or extraction of any component of the audio system In the rare case of a product failure please contact your place of purchase or call our Customer Support Department at 937 743 8248 Warranty Limitations There are no other warranties either express or implied which extend the foregoing and there are no warranties of merchantability or fitness for any particular purpose The warranty will not cover incidental or consequential damage due to defective or improper use of products This includes but is not limited to burnt voice coils overheating bent frames holes in the cone or broken lead wires This warranty gives you specific legal rights and you may also have other rights which vary from state to state Non Warranty Service If non warranty service is required the product may be sent to the Company for repair replacement transportation prepaid by calling 937 743 8248 for details complete instructions and service fee charges m daytonaudio com 705 Pleasant Valley Dr ofo DAYTONAUDIO tel 937 743 8248 Springboro OH 45066 A info daytonaudio com USA ORS Dayton Audio Last Revised 1 7 2015 4
9. sure that all of the audio components are connected to either the same electrical outlet or at least into the same circuit branch Next cable TV systems are notoriously the culprit so be sure to try disconnecting all coaxial feeds that are connected to the system If this solves the problem install a coaxial line isolator and reconnect the system In the very worst case a line level audio isolator transformer connected to the line in of the subwoofer amplifier will usually solve the problem SPECIFICATIONS Rated Power Output 156 watts RMS into 8 ohms 0 1 THD 252 watts RMS into 4 ohms lt 1 0 THD Signal to Noise Ratio 90 dB A weighted Efficiency 66 Input Impedance 10 4K ohms Bass Boost Switchable 6 dB 35 Hz Low Pass Adjustment 40 Hz 180 Hz Phase Adjustment 0 NOR or 180 REV Dimensions 9 13 16 W x 9 13 16 Hx 5 D Enclosure Cutout 8 1 2 x 8 1 2 Power Requirements 115 230 VAC 60 Hz 50 Hz 400W Stand By Power Rating 115 lt 0 29W Weight 12 Ibs The SPA250 complies with ENERGY STAR and CE EuP directive IMPORTANT SAFETY INSTRUCTIONS Read these instructions All the safety and operating instructions should be read before this product is operated Keep these instructions The safety and operating instructions should be retained for future reference To reduce the risk of electric shock do not remove cover No user serviceable parts inside The unit should be connected to an earth grounded
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