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MA258

 20 + 20 watt 

Audio Amplifier

With Headphone Amp

Connection guide

Salt Lake City, Utah

11/17

• Audiophile preamp - amplifier

• Built in Headphone Amplifier

• Low noise, efficient operation

• Small compact size 

• Class D high efficiency amp

WARNING:

 THE MINIMUM SPEAKER IMPEDANCE IS 4 

OHMS.

IF YOU CONNECT AND USE THE MA258 WITH A LOWER 

SPEAKER  IMPEDANCE THAN 4 OHMS YOU WILL DAM-

AGE THE UNIT AND POSSIBLY OTHER EQUIPMENT 

THAT IS CONNECTED TO THE MA258.

CH 4

CH 1

CH 2

CH 3

CH 4

LEVEL

LEVEL

LEVEL

LEVEL

PS12

CLASS AMP

   5 + 5 WATT MIX/AMP   

LEFT

RIGHT

MA251

3.5mm

STEREO

+

+

-

-

BOTH OUTPUTS MUST BE USED

PHANTOM

CH 1

INPUT

CH 2

INPUT

CH 3

INPUT

POWER

LINE

OUT

ON - OFF

CH 2 

MONO

INPUT

MUTE

R

R

R

L

L

L

IN 1

VOLUME

BASS

   20 + 20 WATT AUDIOPHILE AMP   

MA258

MADE IN USA

0

10

www.rolls.com

HEADPHONE

PWR

SELECTOR

TREBLE

INPUT

CH2

PHONO

CH1

PS24

LEFT

RIGHT

+

+

-

-

SPEAKER OUTPUTS

+

-

MA258

PHONO

IN 2

ROLLS

-

+

-

+

SPECIFICATIONS:

Line Input Impedance:   

10K Ohms

Power Output:   

 

20 Watts X 2 (4 Ohms)

Voltage Gain:   

             30 dB Line

Maximum Supply Voltage: 

24 VDC

THD:   

 

 

.05% typical

EIN: 

 

 

 

3 mV

Efficiency: 

 

 

85%

Input Sensitivity: 

 

28 mV

Bandwidth: 

 

 

20Hz - 25 kHz +/- 3dB

+Size:   

 

 

6.75" x 3.5" x 1.5"

Weight:  

 

 

1.6 lb.

75889 02580

6

4

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