Active Loudspeaker with Crossover II

Description: After the 2-way active loudspeaker circuit, give a complete electronic section circuit of one 3-way active loudspeaker. The speaker's choice will become from you, because the particular circuit has the driving possibility of almost all trade loudspeakers. The choice made in the crossover stage is a 3-way crossover [Butterworth] with cutoff point frequencies 200Hz and 3500Hz, with slope -12dB/oct. These frequencies can change and adapt to your own speaker's choice, using the calculation types of Fig.5. There exists the possibility to use another circuit crossover, such as the circuit of 3-way active crossover with slope -24dB/oct. The circuit crossover does not exist above in the main PCB, but is connected to this via the plug J2A that is applied above in the J2B. This can become if in the place of J2A an 8-pin pinhead is placed, and the PCB crossover is mounted above the main PCB in a sandwich form. It can, however, be placed in another point and with a flat cable to transport the signals and the voltages from J2A to J2B. The power supply for ±15V of the crossover circuits is found in the main PCB. A point that should be highlighted is regarding the precision of various calculation values and real values of resistors and capacitors. It is advisable, if the component value does not exist in standard value, to select a combination that will give a value near the theoretical and simultaneously to do the same in the other loudspeaker, in order that the divergence is the same. In the drawing, there exist parallel combinations of resistors, and some of these are not used if they do not need. With TR1-2, the level of high and mid speakers can be adjusted if necessary.

Part List [Fig.1]

R1=47Kohms R19-20=47ohms C17-18=47uF 25V
R2=1Kohms C1=2.2uF 63V MKT TR1-2=47Kohms trimmer
R3=4.7Kohms C2=220pF IC1=TL071
R4-11-13-15-17=NC C3-4-11-12=100nF 63V MKT IC2-3=TL072-NE5532
R5-6=12Kohms C5-6-9-10=10nF 63V MKT J1=2pin conn. 2.54mm pin step
R7-8=120Kohms C13=6.8nF 63V MKT J2A=8pin conn. 2.54mm pin step
R9-10=220Kohms C14=3.3nF 63V MKT or 8 pinhead 2.54mm pin step*
R12-14=10Kohms C15=33nF 63V MKT
R6-18=33Kohms C16=18nF 63V MKT All Resistors are 1/4W 1%
Typical specifications

Input sensitivity: 1Vrms
Input impedance: 47K
High Pass filter: 20Hz - 200Hz
Band Pass filter: 200Hz - 3500Hz
Low Pass filter: 3500Hz - 20kHz
Slope: -12dB/oct

This 3-way active loudspeaker circuit is designed to provide a versatile and high-fidelity audio experience. The circuit utilizes a Butterworth crossover topology, ensuring a smooth frequency response with minimal phase distortion. The choice of cutoff frequencies at 200Hz and 3500Hz allows for optimal separation of audio signals across three distinct frequency bands: low, mid, and high.

The input stage of the circuit features a sensitivity of 1Vrms, accommodating a wide range of audio sources. The input impedance of 47Kohms ensures compatibility with various audio devices, minimizing signal loss.

The high-pass filter operates between 20Hz and 200Hz, effectively removing unwanted low-frequency noise and allowing only higher frequencies to pass to the mid-range speaker. The band-pass filter, spanning 200Hz to 3500Hz, processes the mid frequencies, ensuring clarity and detail in vocal and instrumental sounds. Finally, the low-pass filter operates from 3500Hz to 20kHz, delivering crisp high frequencies to the tweeter while preventing distortion from lower frequency signals.

The circuit also includes adjustable trimmers (TR1 and TR2) for fine-tuning the output levels of the high and mid speakers, providing flexibility in balancing the sound profile according to the user's preferences or room acoustics.

The PCB design facilitates easy integration of the crossover circuit, allowing for modular upgrades or adjustments. The use of standard component values is emphasized to ensure consistency and reliability across different builds, with recommendations for combinations of resistors and capacitors to achieve desired specifications when standard values are unavailable.

Overall, this 3-way active loudspeaker circuit is engineered for high performance, adaptability, and ease of use, making it suitable for both professional and home audio applications.After the 2-way active loudspeaker circuit, give a complete electronic section circuit of one 3-way active loudspeaker. The speaker?s choice will become from you, because the particular circuit has the driving possibility all almost trade loudspeakers.

The choice that made in the crossover stage, is a 3-way crossover [Butterworth] with cut off -point frequencies 200HZ and 3500HZ, with slope -12dB/oct. These frequencies can change and adapted in your own speaker?s choice, using the calculation types of Fig.5.

Exist the possibility is used other circuit crossover, as the circuit of 3-way active crossover with slope -24dB/oct. The circuit crossover does not exist above in main PCB, but is contact with this via the plug J2A that is applied above in the J2B.

This can become if in the place of J2A it?s placed a pinhead with 8 pin and PCB crossover put on above main PCB in form sandwich. It can however be placed in other point and with a flat cable to transport the signals and the voltages from J2A in the J2B.

Power supply for ± 15V of the crossover circuits it?s found in main PCB. A point that I want to highlight is with regard to various in the calculation values precision and real values of resistors and capacitors. It?s good, if the component value does not exist in standard value to select a combination that us will give value near in theoretical and simultaneously to do the same and in the other loudspeaker, in order that the divergence is same.

In the drawing exist parallel combinations resistors, and somebody?s from these are not used if they do not need. With the TR1-2 we adjust the level of high and mid speakers, if it needs. Part List [Fig.1] R1=47Kohms R19-20=47ohms C17-18=47uF 25V R2=1Kohms C1=2.2uF 63V MKT TR1-2=47Kohms trimmer R3=4.7Kohms C2=220pF IC1=TL071 R4-11-13-15-17=NC C3-4-11-12=100nF 63V MKT IC2-3=TL072-NE5532 R5-6=12Kohms C5-6-9-10=10nF 63V MKT J1=2pin conn.

2.54mm pin step R7-8=120Kohms C13=6.8nF 63V MKT J2A=8pin conn. 2.54mm pin step R9-10=220Kohms C14=3.3nF 63V MKT or 8 pinhead 2.54mm pin step* R12-14=10Kohms C15=33nF 63V MKT R6-18=33Kohms C16=18nF 63V MKT All Resistors is 1/4W 1% Typical specifications Input sensitivity 1Vrms Input impedance 47K High Pass filter 20HZ-:-200HZ Band Pass filter 200HZ-:-3500HZ Low Pass filter 3500HZ-:-20KHZ Slope -12dB/oct