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Radio Design Labs ST-PA18
Power Amplifier

OUR PART #  STPA18

Our Price: $128.97
List Price: $172.51
You save 25%! (Low Price Guarantee)
Usually ships in 7-14 business days.
Need it sooner? Call us!

Recommended Accessories

Radio Design Labs' ST-PA18 features a balanced line level input that may be connected unbalanced. The gain control range will accommodate standard unbalanced levels as well as professional balanced levels. The module bridges the input signal. LOOP OUT terminals permit a balanced input to be fed to additional amplifier modules making the ST-PA18 an ideal component in distributed audio system design.

NOTE: Radio Design Labs' PS-24KS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24KS power supply.

The LOOP OUT may also be used to feed a subwoofer amplifier (see RDL ST-CX2S Subwoofer Filter). The ST-PA18 output will drive an 8 ohm speaker or multiple speakers connected to present an 8 ohm load to the amplifier and it is capable of driving 4 O loads. A red COMP LED is provided to indicate the threshold of the integral compressor. Audio levels that could cause the amplified output to clip are compressed according to two dynamic time constants. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics and preventing the compressor from increasing feedback potential when the amplifier is used for paging.

The compressor is designed to remain aurally transparent while maintaining clean, unclipped amplified audio for input overloads of up to 20 dB. The ST-PA18 produces average audio levels and audio clarity normally expected of amplifiers delivering much higher output power. The ST-PA18 operates from an external 24 VDC 1A power supply, sold separately. A POWER LED illuminates when the module is powered. The module provides thermal and output short-circuit protection.

Radio Design Labs ST-PA18 Features:

  • 18 Watts RMS Audio Power Amplifier
  • Output for 8 ohm Speaker
  • Maximized Audio Level at Full Power Output
  • Superior Audio Quality at High Output Levels
  • Line Level Balanced or Unbalanced Input
  • LOOP OUT to Feed Additional Amplifiers
  • Integral Audio Compressor to Control Clipping
  • High Overall Audio Operating Level
  • LED to Indicate Audio Compression

Radio Design Labs ST-PA18 Specifications:

  • Input: Line level (+4 dBu bal; -10 dBV unbal)
  • Input Impedance: 20 kohm balanced bridging; 10 kohm unbal
  • Gain Adjustment: Single turn
  • Minimum Input Levels: -16 dBu* balanced; -18 dBV* unbalanced
  • Maximum Input Levels: +25 dBu balanced; +22 dBV unbalanced
  • Frequency Response: 20 Hz to 20 kHz (+/- 2 dB)*
  • THD+N: < 1%*
    *Measured at compressor threshold level equaling 12 W RMS output power
  • Noise: < -75 dB (below 18 W RMS)
  • Compressor: Threshold 3 dB below rated output, automatic adjusting attack and release
  • CMRR: > 45 dB (50 Hz to 120 Hz)
  • Output Power: 18 W RMS into 8 O
  • Output Circuit: Class D
  • Ambient Operating Environment: 0° C to 30° C Max; 20° C Recommended
  • Indicators(2):
    • Red LED: LED indicates compressor activity
    • Green LED: PowerON
  • Power Requirement: 24 Vdc @ 1000 mA, Ground referenced
Rackmount System for 12 Stick-On Units
Radio Design Labs STR-19A Rackmount System for 12 Stick-On Units
Radio Design Labs' STR-19A Racking System holds up to 12 STICK-ONs in a 19" rack and only occupies two rack spaces.
136.70 182.87 25
In Stock
Free Shipping Available
Stick-On Mounting Rack for 10 Units
Radio Design Labs SR-10 Stick-On Mounting Rack for 10 Units
Radio Design Labs' STR-10 Racking System holds up to 10 STICK-ON units.  It holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or the top (depending on where the adjustment is located on ...
65.41 87.48 25
In Stock
Free Shipping Available
24V @ 1000mA Power Supply
Radio Design Labs PS24KS 24V @ 1000mA Power Supply
Typical Performance: Input: 100 to 240 VAC Output: 24 Vdc, 1 A (UL, CSA) Dimensions: 1.80" x 3.51" x 1.55" (4.6  x 8.9 x 3.9 cm) Efficiency: ENERGY STAR Level IV
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Din Rail Adaptor for STICK-ON
Radio Design Labs DRA-35S Din Rail Adaptor for STICK-ON
The DRA-35S is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module. The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a single DIN rail. Access to ...
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Mounting Kit for STICK-ON, TX, or Rack-Up module
Radio Design Labs MB1-RDL Mounting Kit for STICK-ON, TX, or Rack-Up module
Two mounting brackets mounts a STICK-ON, TX, or Rack-Up module to a flat surface.
3.46 4.08 15
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Rackmount Kit for 10 Stick-On Units
Radio Design Labs STR-19B Rackmount Kit for 10 Stick-On Units
Radio Design Labs' STR-19B Racking System holds up to 10 STICK-ON unitss in a 19 inch rack and only occupies two rack spaces. The STR-19B holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or ...
162.53 217.40 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Free Shipping Available
Mounting Frame for Stick/TX
Radio Design Labs SR-4 Mounting Frame for Stick/TX
Radio Design Labs' SR-4 is a universal module chassis that can mount to a backboard, wall or nearly any other support. It provides mounting for 4 STICK-ON power amplifiers or 7 standard STICK-ON modules. TX ™ modules may also be mounted. ...
84.88 113.53 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs SR-12A STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs' SR-12A chassis can be mounted in a rack or on a backboard to provide mounting of 12 STICK-ONs.
65.41 87.48 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs ST-PBR4 Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs' ST-PBR4 is a mounting frame with slots for four STICK-ON modules.  The ST-PBR4 mounts on an FP-PSB1A power supply bracket or to any flat surface.  The ST-PBR4 design allows the installer to secure the modules ...
34.59 46.27 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
6 Stick-On DIN Rail Adapter Modules
Radio Design Labs DRA-35S-6 6 Stick-On DIN Rail Adapter Modules
Radio Design Labs' DRA-35S-6 is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module.  The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a ...
32.87 38.78 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Strip for STICK-ON Units
Radio Design Labs Smk 12 Mounting Strip for STICK-ON Units
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28.01 37.45 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for STICK-ON Modules
Radio Design Labs ST-RRB1 Mounting Bracket for STICK-ON Modules
Radio Design Labs' ST-RRB1 mounting kit contains a bracket to attach a STICK-ON module to a rear rack rail or to any flat surface. The module slides into the holder and snaps into position. The module may easily be removed.
22.67 26.74 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Detachable Terminal Block
Radio Design Labs Dtb Rdl Detachable Terminal Block
Use DTB's to quickly detach and reattach wiring harness to STICK-ON units.
6.92 8.16 15
Usually ships in 7-14 business days.
Need it sooner? Call us!

Click to download

Radio Design Labs ST-PA18
Power Amplifier

OUR PART #  STPA18

Product Information:

Radio Design Labs' ST-PA18 features a balanced line level input that may be connected unbalanced. The gain control range will accommodate standard unbalanced levels as well as professional balanced levels. The module bridges the input signal. LOOP OUT terminals permit a balanced input to be fed to additional amplifier modules making the ST-PA18 an ideal component in distributed audio system design.

NOTE: Radio Design Labs' PS-24KS power supply is NOT included but is required in order to power this product.  Please see the "Accessories" tab or click here for more information on the PS-24KS power supply.

The LOOP OUT may also be used to feed a subwoofer amplifier (see RDL ST-CX2S Subwoofer Filter). The ST-PA18 output will drive an 8 ohm speaker or multiple speakers connected to present an 8 ohm load to the amplifier and it is capable of driving 4 O loads. A red COMP LED is provided to indicate the threshold of the integral compressor. Audio levels that could cause the amplified output to clip are compressed according to two dynamic time constants. Normal audio level signals remain unaffected by the compressor thereby preserving audio dynamics and preventing the compressor from increasing feedback potential when the amplifier is used for paging.

The compressor is designed to remain aurally transparent while maintaining clean, unclipped amplified audio for input overloads of up to 20 dB. The ST-PA18 produces average audio levels and audio clarity normally expected of amplifiers delivering much higher output power. The ST-PA18 operates from an external 24 VDC 1A power supply, sold separately. A POWER LED illuminates when the module is powered. The module provides thermal and output short-circuit protection.

Radio Design Labs ST-PA18 Features:

  • 18 Watts RMS Audio Power Amplifier
  • Output for 8 ohm Speaker
  • Maximized Audio Level at Full Power Output
  • Superior Audio Quality at High Output Levels
  • Line Level Balanced or Unbalanced Input
  • LOOP OUT to Feed Additional Amplifiers
  • Integral Audio Compressor to Control Clipping
  • High Overall Audio Operating Level
  • LED to Indicate Audio Compression

Radio Design Labs ST-PA18 Specifications:

  • Input: Line level (+4 dBu bal; -10 dBV unbal)
  • Input Impedance: 20 kohm balanced bridging; 10 kohm unbal
  • Gain Adjustment: Single turn
  • Minimum Input Levels: -16 dBu* balanced; -18 dBV* unbalanced
  • Maximum Input Levels: +25 dBu balanced; +22 dBV unbalanced
  • Frequency Response: 20 Hz to 20 kHz (+/- 2 dB)*
  • THD+N: < 1%*
    *Measured at compressor threshold level equaling 12 W RMS output power
  • Noise: < -75 dB (below 18 W RMS)
  • Compressor: Threshold 3 dB below rated output, automatic adjusting attack and release
  • CMRR: > 45 dB (50 Hz to 120 Hz)
  • Output Power: 18 W RMS into 8 O
  • Output Circuit: Class D
  • Ambient Operating Environment: 0° C to 30° C Max; 20° C Recommended
  • Indicators(2):
    • Red LED: LED indicates compressor activity
    • Green LED: PowerON
  • Power Requirement: 24 Vdc @ 1000 mA, Ground referenced
Rackmount System for 12 Stick-On Units
Radio Design Labs STR-19A Rackmount System for 12 Stick-On Units
Radio Design Labs' STR-19A Racking System holds up to 12 STICK-ONs in a 19" rack and only occupies two rack spaces.
136.70 182.87 25
In Stock
Free Shipping Available
Stick-On Mounting Rack for 10 Units
Radio Design Labs SR-10 Stick-On Mounting Rack for 10 Units
Radio Design Labs' STR-10 Racking System holds up to 10 STICK-ON units.  It holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or the top (depending on where the adjustment is located on ...
65.41 87.48 25
In Stock
Free Shipping Available
24V @ 1000mA Power Supply
Radio Design Labs PS24KS 24V @ 1000mA Power Supply
Typical Performance: Input: 100 to 240 VAC Output: 24 Vdc, 1 A (UL, CSA) Dimensions: 1.80" x 3.51" x 1.55" (4.6  x 8.9 x 3.9 cm) Efficiency: ENERGY STAR Level IV
30.25 40.47 25
In Stock
Din Rail Adaptor for STICK-ON
Radio Design Labs DRA-35S Din Rail Adaptor for STICK-ON
The DRA-35S is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module. The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a single DIN rail. Access to ...
19.40 22.89 15
In Stock
Mounting Kit for STICK-ON, TX, or Rack-Up module
Radio Design Labs MB1-RDL Mounting Kit for STICK-ON, TX, or Rack-Up module
Two mounting brackets mounts a STICK-ON, TX, or Rack-Up module to a flat surface.
3.46 4.08 15
In Stock
Rackmount Kit for 10 Stick-On Units
Radio Design Labs STR-19B Rackmount Kit for 10 Stick-On Units
Radio Design Labs' STR-19B Racking System holds up to 10 STICK-ON unitss in a 19 inch rack and only occupies two rack spaces. The STR-19B holds STICK-ONs at an angle allowing for control adjustment from either the edge of a STICK-ON, or ...
162.53 217.40 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Free Shipping Available
Mounting Frame for Stick/TX
Radio Design Labs SR-4 Mounting Frame for Stick/TX
Radio Design Labs' SR-4 is a universal module chassis that can mount to a backboard, wall or nearly any other support. It provides mounting for 4 STICK-ON power amplifiers or 7 standard STICK-ON modules. TX ™ modules may also be mounted. ...
84.88 113.53 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs SR-12A STICK-ON Series 19"W Mounting Rack for up to12 Modules
Radio Design Labs' SR-12A chassis can be mounted in a rack or on a backboard to provide mounting of 12 STICK-ONs.
65.41 87.48 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs ST-PBR4 Mounting Bracket for up to 4 STICK-ON Modules
Radio Design Labs' ST-PBR4 is a mounting frame with slots for four STICK-ON modules.  The ST-PBR4 mounts on an FP-PSB1A power supply bracket or to any flat surface.  The ST-PBR4 design allows the installer to secure the modules ...
34.59 46.27 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
6 Stick-On DIN Rail Adapter Modules
Radio Design Labs DRA-35S-6 6 Stick-On DIN Rail Adapter Modules
Radio Design Labs' DRA-35S-6 is a 35 mm DIN rail mounting bracket that provides positive mounting for any RDL STICK-ON® module.  The oblique mounting angle of the DRA-35S allows an installer to mount several STICK-ON modules to a ...
32.87 38.78 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Strip for STICK-ON Units
Radio Design Labs Smk 12 Mounting Strip for STICK-ON Units
The SMK-12 allows removable surface (up to 6 units) or edge (typically 12, max. 16) mounting of STICK-ON units. They can be fastened to its surface using screws or adhesive foam pads.
28.01 37.45 25
Usually ships in 7-14 business days.
Need it sooner? Call us!
Mounting Bracket for STICK-ON Modules
Radio Design Labs ST-RRB1 Mounting Bracket for STICK-ON Modules
Radio Design Labs' ST-RRB1 mounting kit contains a bracket to attach a STICK-ON module to a rear rack rail or to any flat surface. The module slides into the holder and snaps into position. The module may easily be removed.
22.67 26.74 15
Usually ships in 7-14 business days.
Need it sooner? Call us!
Detachable Terminal Block
Radio Design Labs Dtb Rdl Detachable Terminal Block
Use DTB's to quickly detach and reattach wiring harness to STICK-ON units.
6.92 8.16 15
Usually ships in 7-14 business days.
Need it sooner? Call us!

Click to download

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