Rolls MA252 Manual

Rolls Modtager MA252

Læs gratis den danske manual til Rolls MA252 (2 sider) i kategorien Modtager. Denne vejledning er vurderet som hjælpsom af 3 personer og har en gennemsnitlig bedømmelse på 3.9 stjerner ud af 2 anmeldelser. Har du et spørgsmål om Rolls MA252, eller vil du spørge andre brugere om produktet?

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Side 1/2

MA252

20 + 20 watt

Mixer/Ampliﬁ er

Connection guide

Salt Lake City, Utah

09/11

• RCA Inputs, XLR Mic with Phantom Power

• Volume controls for each Channel

• Low noise, efﬁ cient operation

• Small compact size

• Class D high efﬁ ciency amp

The MA252 is a very compact 20 + 20 watt high efﬁ ciency amp

with a four channel stereo mixer built in. Left and Right stereo

speaker outputs. The unit is perfect for small speakers in small

environments. Great for in ceiling and projector applications where

small size is needed along with class D low radiated heat loca-

tions.

WARNING:

THE MINIMUM SPEAKER IMPEDANCE IS 4

OHMS EACH.

IF YOU CONNECT AND USE THE MA252 WITH A LOW-

ER SPEAKER IMPEDANCE THAN LISTED ABOVE

YOU WILL DAMAGE THE UNIT AND POSSIBLY OTHER

EQUIPMENT THAT IS CONNECTED TO THE MA252.

CH 4

CH 1

CH 2

CH 3CH 4

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

CH 4

CH 1

CH 2

CH 3CH 4

LEVEL

LEFT

RIGHT

INPUT

SPEAKER OUTPUTS

PHANTOM

CH 1

INPUT

CH 2

INPUT

CH 3

INPUT

POWER

LINE

OUT

OFF - ON

CH 2

MONO

INPUT

MUTE

010

PS24

HI CLASS AMP

20 + 20 WATT MIX/AMP

MA252

MADE IN USA

www.rolls.com

SPECIFICATIONS:

Line Input Impedance: 10K Ohms Line

600 Ohms Mic.

Power Output: 20 Watts X 2 (4 Ohms)

Voltage Gain: 55 dB Mic

30 dB Line

Maximum Supply Voltage: 24 VDC

THD: .05% typical

EIN: 3 mV

Efﬁ ciency: 85%

Input Sensitivity: 28 mV

Bandwidth: 20Hz - 25 kHz +/- 3dB

+Size: 6.75" x 3.5" x 1.5"

Weight: 1 lb.

REAR PANEL

SPEAKER OUTPUT: Push terminals for speaker wire.

PS24: For connection to the power supply.

INPUTS: RCA line level inputs and a balanced XLR mic input for CH1.

MUTE JACK: By shorting out the RCA jack labeled MUTE, the Speaker Outputs

will be muted.

XLR INPUT: For connection to a microphone.

PHANTOM POWER SWITCH: Switches the Phantom Power on or off for a con-

denser mic on channel 1.

FRONT PANEL

CHANNEL LEVEL: Adjusts the level of signal from the Line Input to the Line out

RCA's and Speaker outputs.

3.5mm JACK: For connection to an ipod, MP3 player or computer TRS Stereo

(left, right and ground) connection to channel 4

CONNECTION / OPERATION

To operate the MA252, properly connect cords from the sources to be mixed (mics, cas-

sette decks, CD players etc.) into the channel inputs. Connect the speaker outputs to 4

Ohm or higher impedance speakers. Adjust the channel level controls for the desired

volume.

DESCRIPTION

NOTE: THIS MANUAL ASSUMES THE USER HAS A WORKING KNOWL-

EDGE OF AUDIO ELECTRONICS, BALANCED AND UNBALANCED CON-

NECTIONS, AND PROPER SIGNAL LEVEL SETTING.

INSPECTION / WARRANTY

1. Unpack and inspect the MA252 box and package.

If obvious physical damage is noticed, contact the carrier immediately to make a

damage claim. We suggest saving the shipping carton and packing materials for

safely transporting the unit in the future.

2. Please visit our web site at www.rolls.com and click on the Register Your War-

ranty Here button.

CH 4

CH 1

CH 2

CH 3CH 4

LEVEL

INPUT

010

HI CLASS AMP

20 + 20 WATT MIX/AMP

MA252

MADE IN USA

www.rolls.com

CH 4

CH 1

CH 2

CH 3CH 4

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

LEFT

RIGHT

SPEAKER OUTPUTS

PHANTOM

CH 1

INPUT

CH 2

INPUT

CH 3

INPUT

POWER

LINE

OUT

OFF - ON

CH 2

MONO

INPUT

MUTE

PS24

INTRODUCTION

Thank you for your purchase of the MA252. The MA252 is a four channel mixer/

ampliﬁ er designed for Audio and Visual applications. Channels 1 has a micro-

phone XLR input with switchable phantom power. Channel 2 has stereo and

mono RCA inputs. Channel 3 has RCA stereo inputs and channel 4 has a 3.5mm

stereo input. The MA252 is intended for professional applications. It has a

FR4(V94-0) rated glass epoxy circuit board, and a powder coated steel chassis.

All inputs except CH 1 microphone and Ch MONO input are stereo. Outputs for

Speaker and Line are true stereo.

CHANNEL DESCRIPTION

CH 1 INPUT: XLR jack for connection to a microphone. Switchable phantom

power as labeled on unit.

CH 2 INPUTS: Stereo RCA and one mono RCA for connection to a signal source

such as a CD player, cassette deck, tuner, etc.. PLEASE NOTE WITH A MONO

INPUT AS WELL AS A STEREO INPUT, CHANNEL 2 AT CERTAIN IMPED-

ANCES ON THE STEREO INPUT YOU MAY EXPERIENCE CROSS TALK BE-

TWEEN THE LEFT AND RIGHT. THIS IS NORMAL OPERATION AND SHOULD

BE EXPECTED.

CH 3 INPUT: Stereo RCA jack for connection to a signal source such as a CD

player, cassette deck, tuner, etc.

CH4 INPUT: For connection to a stereo 3.5mm(1/8” jack).

LINE OUT: Stereo RCA jacks for connection to a mixer or ampliﬁ cation device.

MUTE

MONO INPUT

LINE OUTS

VCC

V+

CH 1

CH 4

CH 3

CH2

IN 12-24 VAC/VDC

P100K

JAPDC

R11

10K

100K

4.7K

R26

10K

R24

R14

10K

R15

10K

R19

10K

R20

10K

R12 100K

3.3K

47U

1N4001

R22

18K

R23

22K

C14

47U

C13

2200

R10

100

10K

U1A

4560

U1B

4560

3.3K

C8 120PF

120PF

1 2

XLR F PC

C10

47U

4.7K

R13

100

1 3

P1A

P100K X2

1 3

P3A

P100K X2

1 3

P2A

P100K X2

4 6

P3B

P100K X2

4 6

P2B

P100K X2

4 6

P1B

P100K X2

10K

2N3904

C28

47U

+ - - +

STEREO

PHANTOM

C29

10U

332

R21

4.7K

LDRR

PVCCL

MUTE

LIN

RIN

BYPASS

AGND

VCLAMP

PVCCR

PGNDR

ROUT

BSR

GAIN1

GAIN0

AVCC

BSL

LOUT

PGNDL

TPA3122D2N

C20

C23

C24

.1uF

C25

.1uF

C26

.1uF

C27

.1uF

C21

.22uF

C18

.22uF

22uH

R27

4.7K

R28

4.7K

C19

.68uF

C22

.68uF

VCC VCC VCC VCC

SPEAKER OUT

VCC

Rolls Corporation

5968 S 350 W

Murray Utah84107

MA251.SCH

21 October 2009

Title

Size: Document Number:

Date:

Rev:

Sheet of

MA251 CLASS MIXER AMPLIFIER

VCC

R25

220K

2N3904

C15

10U

SW2

SPST

C16

C17

1N4001

C12

2200

C11

2200

PUSH TERMINAL

R16

R18

10K

R17

10K

J2C

RCAX4

5J2D

RCAX4

J2A

RCAX4

2J2B

RCAX4

J3C

RCAX4

J3D

RCAX4

J3A

RCAX4

J3B

RCAX4

3.5STJK

V+

R29 47K

U3B

4560

C31

120PF

R30

47K

U3A

4560

C32

120PF

C30

10U

PHAN

V+

R31

100

C33

503

SCHEMATIC

Produkt Specifikationer

Mærke:	Rolls
Kategori:	Modtager
Model:	MA252

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