Infinity HPS-1000 User manual

PRELIMINARY
SERVICE MANUAL
HPS 1000
POWERED SUBWOOFER
Infinity Systems Incorporated
250 Crossways Park Dr.
Woodbury, New York 11797

- CONTENTS -
SPECIFICATIONS ………….………….….………………………………………..2
SET-UP GUIDE ………………….…………………………………..…………..3
CONTROLS …………………….………….……………………………………….6
OPERATION ………..…..………………………….…………..……………..7
PARTS LIST ………………..………….…………………………………………….9
SCHEMATICS ………..……...…………………………….…………………...17

Infinity HPS-1000 1000w Powered Sub Amp SPECIFICATIONS
Frequency response 18Hz - 120Hz
Drive unit 15" Woofer (2) 15" Passive Radiators
Weight 96lbs/43.5kg
Dimensions 21 7/8 x 20 7/16 x 23 13/16" (556 x 519 x 605mm)
LINE VOLTAGE US 120vac/60Hz
EU 230vac/50-60Hz
Parameter Specification Unit Limits Conditions Notes
Amp Section
Type (Class AB, D, other) AB Bridged -- -- BASH® Power Supply
Load Impedance (speaker) 7Ohms -- Nominal Z-curve required
Rated Output Power 900 Watts 800 1 input driven
THD@ Rated Power 0.8 %122k filter 500w
THD @ 1 Watt 0.5 %122k filter
Polarity 0deg. 0° ±20 In phase at 50Hz in Direct Mode .250 faston (+)……205 faston (-)
DC Offset 20 mV-DC 50 @ Speaker Outputs
Damping factor >200 DF -- @700w/27Hz
Input Sensitivity Input Frequency 27 Hz 27 Nominal Freq. 1 input driven
Line Input 350 mVrms ±2dB 800w ref. 1 input driven
Speaker/Hi Level Input 7.4 Vrms ±2dB 800w ref. 1 input driven
Signal to Noise
SNR-A-Weighted 100 dBA 90 relative to rated power A-Weighting filter
SNR-unweighted 70 dBr 70 relative to rated power 22k filter
SNR rel. 1W-unweighted 60 dBr 55 relative to 1W Output 22k filter
Residual Noise Floor 2mVrms 3Volume @max, using RMS reading DMM/VOM (or A/P)
Residual Noise Floor 1.5 mVrms(max) 2Volume @max, w/ A/P Swept Bandpass Measurement (Line freq.+ harmonics)
Input Impedance Line Input 3k ohms N/A
Speaker/Hi Level Input 470 ohms N/A
Active Filters
Low Pass (fixed or variable) Variable Note: Center positon = 100Hz
Low Pass filter (point or range) 45-120 Hz ±2dB
Slope 12 dB/Octave n/a
Q-- Damping n/a
Normal-Direct Switch yes -- functional
Low Pass filter (point or range)
160 (direct),
45-120 (normal) Hz ±2dB
Slope 12 dB/Octave --
Q-- Damping --
Subsonic filter (HPF) 27 Hz ±2dB
Slope 12 dB/Octave --
Q-- Damping --
Video Boost Switch yes -- --
Boost +3 dB ±1dB
Range 40-80 Hz --
Limiter yes
Features --
Phase Switch (yes/no) yes -- functional
Line Output (80Hz HPF-unity gain) yes -- functional
Volume pot Taper (lin/log) log -- functional
Input Configuration -- --
Line In (L,C,R,AC3,Mono) L,R -- functional
Spkr/Hi Level In (L,C,R,mono) L,R -- functional
Line Outputs (L,C,R) L,R -- functional Z-out=10k: Use 100k load for testing
Line Out Crossover Switch yes
Line Out: 80/120/160Hz HPF 80/120/160 Hz functional
Slope 6dB/Octave functional
Q0.707 Damping functional
Hi Level Out yes -- functional Loop through for L,R Hi Level Inputs
Power on Delay time >3 sec. >3 AC Power Applied
Transients/Pops
ATO Transient 10 mV-peak 20 @ Speaker Outputs
Turn-on Transient 500 mV-peak 1v-pp @ Speaker Outputs AC Line cycled from OFF to ON
Turn-off Transient 500 mV-peak 1v-pp @ Speaker Outputs AC Line cycled from ON to OFF
Efficiency
Stand-by Input Power 10 Watts 15 @ nom. line voltage
Efficiency #REF! %70 @ nom. line voltage 800w ref..
Protection
Thermal Protection yes functional Decreases gain at 113°C -1.3dB
DC Offset Protection yes functional DC present at Speaker Out leads Relay or crowbar (for driver/fire protection)
Line Fuse Rating 6Amps functional Type-T or Slo Blo 2

CONNECTING YOUR SUBWOOFER
If your receiver/processor does not have subwoofer outputs for the left and right channels:
+
—
+++
———
LL
RR
INPUTS OUTPUTS
B-LINK
™

CONNECTING YOUR SUBWOOFER (Continued)
If your receiver/processor has subwoofer outputs for the left and right channels:
If you have a Dolby* Digital or DTS
®
receiver/processor with a low-frequency-effect
(LFE) output:
NOTE: Some receivers have a single
subwoofer output (do not confuse this
with a single LFE output as described
below). In that case, it is recommended
that you use a Y connector (not included)
to maximize performance.
LOW
LEVEL
OUT
LOW
LEVEL
IN
L
R
120Hz
160Hz
80Hz
HIGHPASS
OUTPUT
LOW
LEVEL
OUT
LOW
LEVEL
IN
L
R
SUBWOOFER OR
LFE OUTPUT
120Hz
160Hz
80Hz
HIGHPASS
OUTPUT
NOTE: In this case, you do not need to
use a Y connector. Simply connect the
LFE output on your receiver/processor
to either the left or right input on
the subwoofer.

If your receiver/amplifier has preamp output jacks and main input jacks for the left and
right channels or you have a separate preamp/processor and power amplifier:
This method of hookup can offer the highest level of performance for your complete loudspeaker
system. Your subwoofer incorporates an adjustable high-pass crossover in addition to a variable
low-pass crossover. When hooked up as shown below, the subwoofer will limit the low-frequency
information that is returned to your receiver/amplifier. Your receiver/amplifier does not need to
waste valuable power reproducing the low frequencies. In addition, since no low-frequency
information is being sent to your main loudspeakers, they are able to reproduce mid and high
frequencies with greater clarity.
LOW
LEVEL
OUT
LOW
LEVEL
IN
L
R
120Hz
160Hz
80Hz
RECEIVER/AMPLIFIER
OR PROCESSOR/AMPLIFIER
LEFT
RIGHT
RIGHT LEFT
LEFT
LOUDSPEAKER
RIGHT
LOUDSPEAKER
PRE
OUT MAIN IN
MAIN SPEAKER
OUTPUT
HIGHPASS
OUTPUT

C ONTROLS ...
Figure 2.
IDENTIFICATION OF FRONT PANEL CONTROL
(Refer to Figure 2.)
1. EQ: Optimizes subwoofer performance for audio or video playback.
2. Crossover: Controls the frequency below which the subwoofer will begin working.
3. Phase: Reverse/normal switch changes audio-signal polarity.
4. Gain: Controls subwoofer volume level.
5. Input: Switches between the normal line/speaker inputs and the direct-LFE input.
EQ PHASE INPUT
CROSSOVER GAIN
150 50 10 0
AUDIO VIDEO 0˚ 180˚ NORMAL DIRECT
1 2 3 4 5
100

S ET C ONTROLS ...
P
OWER O N …
A
DJUST G AIN …
C
ROSSOVER A DJUSTMENTS …
P
HASE C ONTROL ...
OPERATION
1. Initially set the HPS’s Gain control to the “O” position.
2. Initially set the HPS’s Crossover control to the 100Hz position.
3. Plug your HPS’s AC cord into a wall outlet. Do not use the outlets on the back of the receiver.
4. Turn on your HPS sub by pressing the power button on the center of the front panel.
5. Turn on your entire audio system and start a CD or movie sound track at a moderate level.
6. Turn your HPS’s Gain control (Figure 2) up to the “5” position (half way). If no sound
emanates from the subwoofer, check the AC-line cord and input cables. Are the connectors
on the cables making proper contact? Is the AC plug connected to a “live” receptacle? Has
the power button been pressed to the “on” position? (Note: A green indicator on the front
panel will light when the power is on.) Once you have confirmed that the subwoofer is
active, proceed by playing a CD, record or cassette. Use a selection that has ample bass
information.
7. Set the overall volume control of the preamplifier or stereo to a comfortable level. Adjust
the subwoofer’s Gain control (Figure 2) until you obtain a pleasing blend of bass. Bass
response should not overpower the room but rather be adjusted so there is a harmonious
blend across the entire musical range. Many users have a tendency to set the subwoofer
volume too loud, adhering to the belief that a subwoofer is there to produce lots of bass.
This is not entirely true. A subwoofer is there to enhance bass, extending the response of
the entire system so the bass can be felt as well as heard. However, overall balance must
be maintained or the music will not sound natural. An experienced listener will set the
volume of the subwoofer so its impact on bass response is always there but never obtrusive.
8. Crossover Control (Figure 2) – The Low-Pass control determines the highest frequency
at which the subwoofer reproduces sounds. If your main speakers can comfortably reproduce
some low-frequency sounds, set this control to a lower frequency setting, between
50Hz – 100Hz. This will concentrate the subwoofer’s efforts on the ultradeep bass sounds
required by today’s films and music. If you are using smaller bookshelf speakers that do
not extend to the lower bass frequencies, set the low-pass crossover control to a higher
setting, between 120Hz – 150Hz.
9. The Phase Control (Figure 2) determines whether the subwoofer speaker’s piston-like
action moves in and out with the main speakers, 0˚, or opposite the main speakers, 180˚.
Proper phase adjustment depends on several variables such as room size, subwoofer
placement and listener position. Adjust the phase switch to maximize bass output at the
listening position.
10. The EQ switch, located on the front panel, optimizes the subwoofer's performance for
both movie and music listening. When in the “Video” position, a special EQ circuit is
activated, enhancing low frequencies by approximately 3dB at 32Hz and delivering the
full impact and excitement of today’s movie soundtracks. When in the “Audio” position,
the subwoofer provides the accurate and linear frequency response that is ideal when a
natural tonal balance is desired for music listening.
11. Remember: every system, room and listener is different. There are not necessarily any right
or wrong settings; any setting you choose will result in excellent performance. Should you
decide to fine-tune your system for optimum performance, be patient and trust your ears.
It will be worth the effort involved to fully “tweak” your system.
4
4
2
3

A WORD OF ADVICE
The low-frequency Crossover and Volume controls may be set anywhere within their rotation.
However, it will be a most unusual circumstance if you have to set the Volume control completely
clockwise. This may indicate an unbalanced condition in your system (too much bass), that the
system is in an especially large room, or that speaker placement may be incorrect. Try several
other locations before concluding that the Volume control must be set at maximum.
OVERDRIVE PROTECTION
Automatic limiting circuitry helps prevent overdriving a connected subwoofer by softly clipping
the input signal if it exceeds a predetermined threshold. Depending on the level, you may or
may not hear slight distortion on musical peaks. This protection is completely automatic, with
no user adjustments. However, if you do hear distortion continuously while playing music,
the input signal level (feeding the HPS) may be too high and should be lowered. If this doesn’t
solve the problem, check the connections and that the other components in the audio chain are
operating properly.
A WORD ABOUT TONE CONTROLS
The tone controls on your electronic components (preamplifier, receiver, etc.) should be used
with the utmost discretion. Excessive boost can create severe power demands on your power
amplifier. Maximum bass boost can create a demand for literally hundreds of watts in the bass
region, whereas in the “flat” position, or with the tone controls switched out of the system, your
average listening level may be impressively and realistically loud at fewer than 10 watts. The
remaining power capacity required is on reserve for power peaks on sharp transients and
powerful crescendos.

HPS1000 PARTS LIST AMP ASSEMBLY #333783-001
Power supply PCB
Part # Description Qty Ref. Designator
Integrated Circuits
UA0003 OPAMP, QUAD 14PIN DIL LM324N 1EA U3
UP0004 PWM, 8PIN DIL UC3842N 1EA U5
Transistors
QB0002 TRANS, NPN 40V .6A TO92 2N4401 3EA Q4,Q13,Q14
QB0014 TRANS, PNP MPSA92 TO92 2EA Q5,Q7
QB0017 TRANS, NPN 150V 0.6A 2N5551 2EA Q1,Q23
QB0018 TRANS, PNP 150V 0.6A 2N5401 2EA Q22,Q26
QB0050 TRANS, TO92 MPA-44 1EA Q8
QB0013 TRANS, PNP TIP30C TO220 1EA Q21
QB0019 TRANS, NPN TIP29B/C T0220 1EA Q19
QB0033 TRANS, NPN 250V 1A TO220 TIP47 1EA Q3
QM0015 MOSFET, IRF640 TO220AB 2EA Q9,Q27
Capacitors
CC0020 CAP, CA 470PF 100V 5% 2EA C3,C73
CC0040 CAP, CA 4700PF 100V 10% 1EA C6
CC0059 CAP, CA .1UF 100V 20% 3EA C13,C35,C65
CC0065 CAP, CA 2200P 50V 5% 2EA C19,C20
CC0072 CAP, CA 100PF 100V 10% 1EA C74
CC0082 CAP, CA .1UF 50V 20% 2EA C55,C56
CC0087 CAP, CA .01UF 100V 20% 1EA C28
CC0021 CAP, C 470PF 1KV 10% 3EA C2,C9,C11
CC0032 CAP, C 2200PF 600V 10% 1EA C14
CC0079 CAP, C .1UF 50V 20% .1LS 1EA C24
CC0095 CAP, C 470P 100V 5 1EA C23
CC0017 CAP, C 330PF 100V 10% 1EA C22
CC0020 CAP, CA 470PF 100V 5% 1EA C10
CE0003 CAP, E 2.2UF 50V 20% 105C 2EA C41,C42 8