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Service Manual
BRIDGEABLE POWER AMPLIFIER
GM-X552/X1R/EW
ORDER NO.
CRT2616
GM-X552
GM-X552 GM-X552
X1R/EW X1R/ES
X1R/UC
CONTENTS
1. 2. 3. 4. 5. SAFETY INFORMATION............................................2 EXPLODED VIEWS AND PARTS LIST ......................2 SCHEMATIC DIAGRAM.............................................6 PCB CONNECTION DIAGRAM................................12 ELECTRICAL PARTS LIST........................................16 6. ADJUSTMENT .........................................................18 7. GENERAL INFORMATION.......................................19 7.1 DISASSEMBLY ..................................................19 8. OPERATIONS AND SPECIFICATIONS ....................20
PIONEER CORPORATION
4-1, Meguro 1-Chome, Meguro-ku, Tokyo 153-8654, Japan PIONEER ELECTRONICS SERVICE INC. P.O.Box 1760, Long Beach, CA 90801-1760 U.S.A. PIONEER EUROPE N.V. Haven 1087 Keetberglaan 1, 9120 Melsele, Belgium PIONEER ELECTRONICS ASIACENTRE PTE.LTD. 253 Alexandra Road, #04-01, Singapore 159936
C PIONEER CORPORATION 2000
K-ZZS. NOV. 2000 Printed in Japan
GM-X552
1. SAFETY INFORMATION
- GM-X552/X1R/UC
CAUTION This service manual is intended for qualified service technicians; it is not meant for the casual do-it-yourselfer. Qualified technicians have the necessary test equipment and tools, and have been trained to properly and safely repair complex products such as those covered by this manual. Improperly performed repairs can adversely affect the safety and reliability of the product and may void the warranty. If you are not qualified to perform the repair of this product properly and safely; you should not risk trying to do so and refer the repair to a qualified service technician. WARNING This product contains lead in solder and certain electrical parts contain chemicals which are known to the state of California to cause cancer, birth defects or other reproductive harm. Health & Safety Code Section 25249.6 - Proposition 65
2. EXPLODED VIEWS AND PARTS LIST
2.1 PACKING
2
GM-X552
NOTE:
- Parts marked by "*" are generally unavailable because they are not in our Master Spare Parts List. - Screws adjacent to mark on the product are used for disassembly.
- PACKING SECTION PARTS LIST
Mark No. * 1-1 1-2 1-3 * 1-4 2 3 4 5 6 7 Description Warranty Card Owner's Manual Owner's Manual Card Screw Polyethylene Bag Polyethylene Bag Carton Contain Box Protector GM-X552/X1R/UC Not used HRD0165 Not used ARY1048 BYC40P180FZK HEG0011 HEG0013 HHG0280 HHL0280 HHP0106 HDE0036 HNS0101 Part No. GM-X552/X1R/EW HRY1157 HRD0157 Not used Not used BYC40P180FZK HEG0011 HEG0013 HHG0280 HHL0280 HHP0106 HDE0036 HNS0101 GM-X552/X1R/ES Not used HRD0166 HRD0172 Not used BYC40P180FZK HEG0011 HEG0013 HHG0280 HHL0280 HHP0106 HDE0036 HNS0101
8 Cord Assy 9 Cover
- Owner's Manual
Model GM-X552/X1R/UC GM-X552/X1R/EW GM-X552/X1R/ES Part No. HRD0165 HRD0157 HRD0166 HRD0172 Language English, French English, Spanish, German, French, Italian, Dutch English, Spanish Portuguese(B), Arabic
3
GM-X552
2.2 EXTERIOR
A
4
GM-X552
(1) EXTERIOR SECTION PARTS LIST
Mark No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Description Screw Screw Screw Screw Screw(M3x12) Screw(M3x5) Screw(M3x8) Screw Panel Case Panel Holder Heat Sink Cover Spacer Amp Unit Terminal(CN999) Fuse(25A) Pin Jack(CN851) Terminal(CN901) Part No. BBZ30P050FMC BBZ30P060FMC BBZ30P080FMC BSZ30P050FZK CBA1323 HBA0006 HBA0011 PPZ30P100FZK
See Contrast table(2)
Mark No. 21 22 23 24 25
Description Terminal(CN902) Terminal(CN903) Connector(CN852) Holder Screw
Part No. HKE0021 HKE0021 HKM1077 HNC0082 PPZ30P100SAD HXA0322
26 Light Pipe Unit
HNB0133
See Contrast table(2)
HNC0080
See Contrast table(2)
HNS0101 HNV0016
See Contrast table(2)
CKF1059 HEK0025 HKB0002 HKE0020
(2) CONTRAST TABLE GM-X552/X1R/UC, EW and ES are constructed the same except for the following:
Mark No. 9 11 13 16 Description Panel Panel Heat Sink Amp Unit GM-X552/X1R/UC HNB0124 HNB0137 HNR0180 HWH0142 Part No. GM-X552/X1R/EW HNB0141 HNB0145 HNR0188 HWH0141 GM-X552/X1R/ES HNB0124 HNB0137 HNR0180 HWH0143
5
1
2
3
4
GM-X552
3. SCHEMATIC DIAGRAM
3.1 OVERALL CONNECTION DIAGRAM(GUIDE PAGE)
Note: When ordering service parts, be sure to refer to "EXPLODED VIEWS AND PARTS LIST" or "ELECTRICAL PARTS LIST".
A
SPEAKER INPUT
L+ R+ L- R-
A-a
A AMP UNIT
A-a
A-b
Large size SCH diagram
LPF SELECT
A-a
A-b
Guide page
ISOLATOR GAIN = 1
LP FILTER 80Hz - 12dB/OCT
A-a
A-b
Detailed page
B
C
DC/DC CONVERTER
BFC
(EW,ES mo
REGULATOR
D
6
A
1
2
3
4
5
6
7
8
GM-X552
A-b
AMP GAIN = 6.2 - 30dB
A
GAIN
B
C
C
odel)
D
5
6
7
A
8
7
B A
D C
8
A-a A-b
GM-X552
A-a
A AMP UNIT
1 2
LPF SELECT
1
ISOLATOR GAIN = 1 LP FILTER 80Hz - 12dB/OCT
1
SPEAKER INPUT
L+ R+
L- R-
2
2
3
3
3
4
4
5
5
4
DC/DC CONVERTER
BFC
(EW,ES model)
6
6
5
REGULATOR
7
7
6
A-a
A-a A-b
A B C
GM-X552
8
8
9
D
B A
D C
10
A-a A-b
GM-X552
A-b
AMP GAIN = 6.2 - 30dB
1
1
2
2
1
2
GAIN
3
3
3
4
4
5
6
7
8
GM-X552
A-a A-b
A
B
C
D
odel)
5
4
6
5
6
7
A-b
8
11
1
2
3
4
GM-X552
4. PCB CONNECTION DIAGRAM
4.1 AMP UNIT
NOTE FOR PCB DIAGRAMS
A
1. The parts mounted on this PCB include all necessary parts for several destination. For further information for respective destinations, be sure to check with the schematic diagram. 2. Viewpoint of PCB diagrams
Connector Capacitor
A AMP UNIT
SIDE A
SPEAKER R+ INPUT L+
R-
L-
P.C.Board
Chip Part
SIDE B
B
INPUT
L
R
C
GAIN
LPF
D
12
A
1
2
3
4
5
6
7
8
GM-X552
SIDE A
A
FUSE
B
BREMOTE
SPEAKER OUTPUT
C
SPEAKER OUTPUT
D BFC
5
6
7
A
8
13
1
2
3
4
GM-X552
A
A
AMP UNIT
B
C
POWER
D
14
A
1
2
3
4
5
6
7
8
GM-X552
SIDE B
A
B
C
R
D
5
6
7
A
8
15
GM-X552
5. ELECTRICAL PARTS LIST
NOTE:
- Parts whose parts numbers are omitted are subject to being not supplied. - The part numbers shown below indicate chip components. Chip Resistor RS1/_S___J,RS1/__S___J Chip Capacitor (except for CQS.....) CKS....., CCS....., CSZS.....
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------Part No. ------------------------=====Circuit Symbol and No.===Part Name --- ----------------------------------------------D D D D D D D D D D D D D D D D L T TH TH TH S S VR 556 557 558 601 653 654 658 659 661 662 663 903 907 908 909 910 901 901 901 902 903 101 901 453 Diode Diode Diode LED Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Diode Choke Coil 50µH Transformer Thermistor Thermistor Thermistor Switch(LPF SELECT) Switch(BFC)(EW,ES model) Volume 10k(A) Fuse 25A Part No. ------------------------1SS133 1SS133 1SS133 SML210LT(LMN) 1SS133 HZS7L(B2) 1SS133 1SS133 1SS133 ERA15-02VH ERA15-02VH RM4Z FML22S HZS16L(1) HZS16L(1) FML22R CTH1218 HTT0015 CCX1013 CCX1013 CCX1035 CSH1021 HSH-156 CCS1241 HEK0025
A
IC IC IC IC IC Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q Q D D D
Unit Number : HWH0142(GM-X552/X1R/UC) : HWH0141(GM-X552/X1R/EW) : HWH0143(GM-X552/X1R/ES) Unit Name : Amp Unit
101 651 851 852 901 203 204 205 551 552 553 554 555 556 559 560 561 562 563 564 565 566 567 568 569 570 571 572 653 654 655 657 658 659 660 661 902 903 904 905 906 907 908 909 910 911 912 553 554 555 IC IC IC IC IC Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor Transistor FET FET Transistor Transistor Transistor Transistor FET FET Diode Diode Diode NJM4558L PA2027A NJM2068D NJM2068D UPC494C DTA124ES 2SC2458 2SC2458 2SA992 2SA992 2SA992 2SA992 2SC5168 2SC5168 2SC1845 2SC1845 2SA992 2SA992 2SC1845 2SC1845 2SC1845 2SC1845 2SD2438 2SD2438 2SB1587 2SB1587 2SD1768S 2SD1768S 2SA1048 2SC2458 2SC2458 2SA1048 2SC2458 2SA1048 2SB1243 2SC2458 2SA1048 2SB1277 2SB1277 STP55NE06FP STP55NE06FP 2SD1864 2SB1243 2SD1919 2SD1919 STP55NE06FP STP55NE06FP 1SS133 1SS133 1SS133
MISCELLANEOUS
RESISTORS
R R R R R R R R R R R R R R R R R R R R R R R R R 123 124 203 204 465 466 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 575 RS1/10S222J RS1/10S222J RS1/10S472J RS1/10S472J RD1/4PU101J RD1/4PU101J RD1/4PU103J RD1/4PU103J RD1/4PU333J RD1/4PU333J RD1/4PU331J RD1/4PU331J RD1/4PU331J RD1/4PU331J RD1/4PU681J RD1/4PU681J RD1/4PU511J RD1/4PU511J RD1/4PU333J RD1/4PU333J RD1/4PU681J RD1/4PU681J RD1/4PU223J RD1/4PU223J RD1/4PU101J
16
GM-X552
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 576 577 578 579 580 581 582 583 584 585 586 595 596 597 598 599 600 601 602 605 606 657 658 659 660 661 662 663 664 665 666 667 668 669 671 672 676 678 679 680 681 682 683 684 685 686 701 702 703 704 705 706 707 708 851 852 853 854 855 856 857 858 861 862 879 0.22 0.22 0.22 0.22 0.22 0.22 0.22 0.22
Part No. ------------------------RD1/4PU101J RD1/4PU512J RD1/4PU512J RD1/4PU222J RD1/4PU222J RD1/4PU151J RD1/4PU151J RD1/4PU100J RD1/4PU100J RD1/4PU100J RD1/4PU100J RD1/4PU563J RD1/4PU563J RD1/4PU564J RD1/4PU564J RD1/4PU473J RD1/4PU473J RS1/2PMF100J RS1/2PMF100J RD1/4PU331J RD1/4PU331J RD1/4PU104J RD1/4PU472J RD1/4PU103J RD1/4PU102J RD1/4PU472J RD1/4PU221J RD1/4PU563J RD1/4PU473J RD1/4PU103J RD1/4PU103J RD1/4PU222J RD1/4PU472J RD1/4PU222J RD1/4PU221J RD1/4PU152J RD1/4PU222J RD1/4PU472J RD1/4PU101J RD1/4PU472J RD1/4PU682J RD1/4PU682J RD1/4PU103J RD1/4PU223J RD1/4PU223J RD1/4PU223J CCN1013 CCN1013 CCN1013 CCN1013 CCN1013 CCN1013 CCN1013 CCN1013 RS1/10S471J RS1/10S471J RS1/10S223J RS1/10S223J RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RN1/10SE1002D RS1/10S683J
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R R 880 882 884 887 888 889 890 902 907 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 928 929 930 931 932 935 936 937 938 939 947 948 949 950 951 (EW,ES model)
Part No. ------------------------RS1/10S683J RS1/10S103J RS1/10S103J RS1/10S103J RS1/10S103J RS1/10S103J RS1/10S103J RS1/2PMF220J RS1/10S473J RS1/2PMF220J RS1/10S153J RS1/10S102J RD1/4PU272J RD1/4PU472J RS1/10S472J RS1/10S472J RD1/4PU332J RD1/4PU332J RS1/2PMF220J RS1/2PMF220J RD1/4PU472J RD1/4PU472J RD1/4PU472J RD1/4PU472J RS1/2PMF121J RS1/2PMF121J RS1/10S105J RS1/2PMF121J RS1/2PMF121J RS1/2PMF100J RS1/2PMF100J RD1/4PU104J RS1/10S202J RD1/4PU223J RS1/10S103J RS1/10S272J RS1/10S272J RS1/2PMF560J RS1/2PMF560J RD1/4PU163J RS1/10S101J RD1/4PU563J
CAPACITORS
C C C C C C C C C C C C C C C C C C C C 551 552 553 554 555 556 559 560 561 562 563 564 565 566 567 568 569 570 571 572 CEAS100M50 CEAS100M50 CKPUYB101K50 CKPUYB101K50 CQMA471J50 CQMA471J50 CEAS101M10 CEAS101M10 CCPUCH220J50 CCPUSL330J50 CCCCH330J100 CCCCH330J100 CFTLA223J50 CFTLA223J50 CFTLA333J50 CFTLA333J50 CQMA102J50 CQMA102J50 CCCCH330J100 CCCCH330J100
17
GM-X552
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C 573 574 651 652 653 654 655 656 658 659 661 662 671 851 852 853 854 859 860 866 867 868 869 870 871 872 873 876 877 878 879 902 903 904 905
Part No. ------------------------CCCCH330J100 CCCCH330J100 CCH1036 CFTLA103J50 CEAS100M50 CEAS100M50 CFTLA103J50 CEAS470M16 CEAS220M50 CCH1183 CFTLA103J50 CFTLA103J50 CEAS101M16 CKPUYB471K50 CKPUYB471K50 CEAS100M50 CEAS100M50 CCSQCH470J50 CCSQCH470J50 CEAS100M50 CEAS100M50 CFTLA223J50 CCSQCH470J50 CFTLA223J50 CCSQCH470J50 CFTNA224J50 CFTNA224J50 CFTLA154J50 CFTLA154J50 CFTLA103J50 CFTLA103J50 CEAS221M10 CEAS2R2M50 CEAS101M16 CQMA472J50
=====Circuit Symbol and No.===Part Name --- ----------------------------------------------C C C C C C C C C C C C C C C C C 906 907 908 909 912 913 914 915 916 918 919 920 927 932 933 934 1000 3300µF/16V 3300µF/16V 3300µF/35V 3300µF/35V
Part No. ------------------------CQMA472J50 HCH0005 HCH0006 HCH0006 CEAS470M16 CEAS470M16 CQMA102J50 CQMA102J50 CFTNA224J50 CEAS471M35 CEAS471M35 CFTLA564J50 CQMA102J50 CEAS470M10 CEAS101M16 CEAS101M16 HCH0005
220µF/10V
470µF/16V
6. ADJUSTMENT
There is no information to be shown in this chapter.
18
GM-X552
7. GENERAL INFORMATION
7.1 DISASSEMBLY
- Removing the Case and the Panel (Fig.1) Case Remove the four screws. Remove the two screws. Remove the three screws and then remove the Case.
Remove the six screws and then remove the Panel. Panel
Fig.1
- Removing the Amp Unit (Fig.2) Remove the fourteen screws. Remove the screw. Remove the twelve screws and then remove the Amp Unit.
Fig.2 Amp Unit
19
GM-X552
8. OPERATIONS AND SPECIFICATIONS
8.1 OPERATIONS
- GM-X552/X1R/EW
20
Setting the Unit
Power Indicator
The power indicator lights when the power is switched on.
Gain Control
If the sound level is too low, even when the volume of the car stereo used along with this power amplifier is turned up, turn gain control on the front of the power amplifier clockwise. If the sound distorts when the volume is turned up, turn the gain control counter-clockwise.
· When using with an RCA equipped car stereo (standard output of 500 mV), set to the NORMAL position. When using with an RCA equipped Pioneer car stereo with max. output of 4 V or more, adjust level to match the car stereo output level. · If you hear too much noise when using the speaker input terminals, turn the gain control counter-clockwise.
BFC (Beat Frequency Control) Switch
If you hear a beat while listening to an MW/LW broadcast with your car stereo, change the BFC switch using a small standard tip screwdriver. (GM-X552/X1R/EW,ES)
LPF (Low-Pass Filter) Select Switch
Set the LPF select switch as follows according to the type of speaker that is connected to the speaker output connector and the car stereo system: LPF Select Switch
LPF (left) OFF (right)
Audio frequency range to be output
Very Low Frequency range Full range
Speaker Type
Subwoofer Full range
Remarks
Connect a subwoofer.
GM-X552
21
GM-X552
Connection Diagram
Fuse (30 A) Special red battery wire [RD-223] (sold separately) After making all other connections at the amplifier, connect the battery wire terminal of the amplifier to the positive (+) terminal of the battery. Fuse (30 A) Ground wire (black) [RD-223] (sold separately) Connect to metal body or chassis.
Grommet
Connecting wires with RCA pin plugs (sold separately).
Car stereo with RCA output jacks
External Output
Front side
RCA input jack
Speaker input terminal
Back side Fuse (25 A)
Speaker output terminal
System remote control wire (sold separately) Connect the male terminal of this wire to the system remote control terminal of the car stereo (SYSTEM REMOTE CONTROL). The female terminal can be connected to the auto-antenna relay control terminal. If the car stereo does not have a system remote control terminal, connect the male terminal to the power terminal through the ignition switch.
22
GM-X552
8.2 SPECIFICATIONS
- GM-X552/X1R/UC
Power source ........................................................................ 14.4 V DC (10.8 -- 15.1 V allowable) Grounding system .................................................................................................... Negative type Current consumption .............................................................. 13.2 A (at continuous power, 4 ) Idle current ...................................................................................................................... 5 -- 30 mA Average current drawn* .................................................................... 4.4 A (4 for two channels) ........................................................................................................ 7.4 A (4 for one channel) Fuse ............................................................................................................................................ 25 A Dimensions .................................................................................... 279 (W) x 58 (H) x 237 (D) mm ................................................................................................ [11 (W) x 2-1/4 (H) x 9-3/8 (D) in] Weight .................................................................. 3.6 kg (7.9 lbs) (Leads for wiring not included) Maximum power output .............................................................................. 100 W x 2 / 300 W x 1 Continuous power output ........................ 50 W x 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.08% THD) .............................................................. 150 W x 1 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD) ................................................................ 75 W x 2 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD) Load impedance ........................................................................................ 4 (2 -- 8 allowable) .................................................................................... (Bridge connection: 4 -- 8 allowable) Frequency response ...................................................................... 10 -- 50,000 Hz (+0 dB, 1 dB) Signal-to-noise ratio ................................................................................ 100 dB (IHFA network) Distortion ........................................................................................................ 0.008% (10 W, 1 kHz) Separation .................................................................................................................. 60 dB (1 kHz) Low pass filter .......................................................................................... Cut off frequency: 80 Hz ............................................................................................................ Cut off slope: 12 dB/oct Maximum input level/impedance ................................................ RCA: 6.5 V/22 k (0.4 -- 6.5 V) .............................................................................................. Speaker: 26 V/40 k (1.6 -- 26 V) Note: · Specifications and the design are subject to possible modification without notice due to improvements. *Average current drawn · The average current drawn is nearly the maximum current drawn by this unit when an audio signal is input. Use this value when working out total current drawn by multiple power amplifiers.
- GM-X552/X1R/EW
Power source .......................................................................... 14.4 V DC (10.8 -- 15.1 V allowable) Grounding system ...................................................................................................... Negative type Current consumption ................................................................ 13.2 A (at continuous power, 4 ) Idle current ...................................................................................................................... 5 -- 30 mA Average current drawn* .................................................................... 4.4 A (4 for two channels) .......................................................................................................... 7.4 A (4 for one channel) Fuse ............................................................................................................................................ 25 A Dimensions ...................................................................................... 279 (W) x 58 (H) x 237 (D) mm Weight .................................................................................. 3.6 kg (Leads for wiring not included) Maximum power output .............................................................................. 100 W x 2 / 300 W x 1 Continuous power output ........................................ 75 W x 2 / 230 W x 1 (DIN45324, +B=14.4 V) Load impedance ........................................................................................ 4 (2 -- 8 allowable) .................................................................................... (Bridge connection: 4 -- 8 allowable) Frequency response ........................................................................ 10 -- 50,000 Hz (+0 dB, 1 dB) Signal-to-noise ratio .................................................................................. 100 dB (IEC-A network) Distortion ........................................................................................................ 0.008 % (10 W, 1 kHz) Separation .................................................................................................................... 60 dB (1 kHz) Low pass filter .......................................................................................... Cut off frequency: 80 Hz .............................................................................................................. Cut off slope: 12 dB/oct Maximum input level/impedance .................................................. RCA: 6.5 V/22 k (0.4 -- 6.5 V) ................................................................................................Speaker: 26 V/40 k (1.6 -- 26 V) Note: · Specifications and the design are subject to possible modification without notice due to improvements. *Average current drawn · The average current drawn is nearly the maximum current drawn by this unit when an audio signal is input. Use this value when working out total current drawn by multiple power amplifiers.
23
GM-X552
- GM-X552/X1R/ES
Power source .............................................................................................. 14.4 V DC (10.8 -- 15.1 V allowable) Grounding system .......................................................................................................................... Negative type Current consumption .................................................................................... 13.2 A (at continuous power, 4 ) Idle current ...................................................................................................................... 5 -- 30 mA Average current drawn* ........................................................................................ 4.4 A (4 for two channels) .............................................................................................................................. 7.4 A (4 for one channel) Fuse .................................................................................................................................................................. 25 A Dimensions .......................................................................................................... 279 (W) x 58 (H) x 237 (D) mm Weight ...................................................................................................... 3.6 kg (Leads for wiring not included) Maximum power output .................................................................................................... 100 W x 2 / 300 W x 1 Continuous power output ............................................ 50 W x 2 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.08% THD) .................................................................................. 150 W x 1 (at 14.4 V, 4 , 20 -- 20,000 Hz, 0.8% THD) .................................................................................... 75 W x 2 (at 14.4 V, 2 , 20 -- 20,000 Hz, 0.8% THD) Load impedance ............................................................................................................ 4 (2 -- 8 allowable) ........................................................................................................ (Bridge connection: 4 -- 8 allowable) Frequency response ............................................................................................ 10 -- 50,000 Hz (+0 dB, 1 dB) Signal-to-noise ratio ........................................................................................................ 100 dB (IEC-A network) Distortion .............................................................................................................................. 0.008% (10 W, 1 kHz) Separation ........................................................................................................................................ 60 dB (1 kHz) Low pass filter ................................................................................................................ Cut off frequency: 80 Hz .................................................................................................................................. Cut off slope: 12 dB/oct Maximum input level/impedance ...................................................................... RCA: 6.5 V/22 k (0.4 -- 6.5 V) .................................................................................................................... Speaker: 26 V/40 k (1.6 -- 26 V) Note: · Specifications and the design are subject to possible modification without notice due to improvements. *Average current drawn · The average current drawn is nearly the maximum current drawn by this unit when an audio signal is input. Use this value when working out total current drawn by multiple power amplifiers.