Transcript Articula
Active Speakers and Amplifiers
COMPONENTS
Amplifiers
Active Crossover
Control Circuits
R. R. Cordell 10/18/03
Active Speakers and Amplifiers
Most people own an active speaker system
Subwoofer
Computer Speakers
R. R. Cordell 10/18/03
Active Speakers and Amplifiers
ADVANTAGES
Too many to list
Dynamic range, peak power
Efficiency
Small, inexpensive XO components
Greater control of driver dynamics
No speaker cables
Absence of XO interactions
R. R. Cordell 10/18/03
Active Speakers and Amplifiers
The Gain Clone
+35V
+
IN
100K
LM3886
-
~ 60W @ 8 ohms
OUT
-35V
20K
1K
220
1 uF
3.3
+
IN
1M
100K
LM3886
220 pF
-
0.047
20K
1K
50 uF
+
OUT
3 uH
3 Hz
R. R. Cordell 10/18/03
22
Active Speakers and Amplifiers
INVERTING GAIN CLONE WITH SMALL CAPS
1M
6 Hz
+
1 uF
0.1 uF
+
1.6 Hz
+
IN
1M
1M
OPA2604B
10K
-
LM3886
1K
BUFFER
OPA2604A
INVERTER
-
10K
R. R. Cordell 10/18/03
20K
OUT
Active Speakers and Amplifiers
INVERTING SUPER GAIN CLONE
+
+
+
IN
1M
INVERTER
LM3886
1K
BUFFER
-
OPA2604B
10K
-
OPA2604A
10K
-
20K
0.1 uF
1M
0.3 Hz
INTEGRATOR
1M
LF356
DC SERVO FEEDBACK
+
OUT
Active Speakers and Amplifiers
NON-INVERTING SUPER GAIN CLONE
+
IN
22K
LM3886
100K
-
DC SERVO FEEDBACK
10K
INVERTER
1K
0.3 Hz
10K
-
LF353B
+
20K
0.1 uF
INTEGRATOR
1M
LF353A
+
OUT
Active Speakers and Amplifiers
ACTIVE CROSSOVER
IN
BSC
LPF
750 Hz
NOTCH
4 kHz
LINKWITZ
TRANS
HPF
750 Hz
LPF
4 kHz
NOTCH
9 kHz
MIDRANGE
EQ
LF
MF
HPF
4 kHz
HF
Active Speakers and Amplifiers
Voltage Follower Filters
IN
+
OPA604
OUT
BUF
-
2 kHz First-Order LPF
7.95K
0.01 uF
+
-
Fourth-Order L-R LPF
+
+
-
-
Active Speakers and Amplifiers
Voltage Follower Filters
NOTCH FILTER
IN
+
OUT
-
+
-
Active Speakers and Amplifiers
ACTIVE BAFFLE STEP COMPENSATION
IN
+
OUT
100 pF
10K
10K
0.01 uF
Active Speakers and Amplifiers
Linkwitz Transform
R2
R2
C2
R3
C2
R3
C3
R1
R1
IN
OUT
+
47 Hz, 0.56 -> 20 Hz, 0.6
R1 = 14K
C1 = 1.0 uF
R2 = 79K
C2 = 0.056 uF
R3 = 79K
C3 = 0.18 uF
Active Speakers and Amplifiers
Active Speakers and Amplifiers
Active Speakers and Amplifiers