Thomann Block-300B Users guide

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Block-300B

bass head

user manual

Musikhaus Thomann

Thomann GmbH

Hans-Thomann-Straße 1

96138 Burgebrach

Germany

Telephone: +49 (0) 9546 9223-0

E-mail: info@thomann.de

Internet: www.thomann.de

19.01.2021, ID: 497726

Table of contents

1 General information................................................................................................................................. 4

1.1 Further information........................................................................................................................... 5

1.2 Notational conventions.................................................................................................................... 6

1.3 Symbols and signal words............................................................................................................... 6

2 Safety instructions..................................................................................................................................... 8

3 Features....................................................................................................................................................... 13

4 Installation and starting up................................................................................................................ 14

5 Connections and operating elements........................................................................................... 15

6 Technical specications....................................................................................................................... 21

7 Plug and connection assignment.................................................................................................... 24

8 Protecting the environment.............................................................................................................. 27

Block-300B

General information

1 General information

This manual contains important instructions for the safe operation of the unit. Read and follow the safety instructions and all other instructions. Keep the manual for future reference. Make sure that it is available to all those using the device. If you sell the unit please make sure that the buyer also receives this manual.

Our products are subject to a process of continuous development. Thus, they are subject to change.

bass head

1.1 Further information

General information

On our website (www.thomann.de) you will nd lots of further information and details on the following points:

Download This manual is also available as PDF le for you to download.

Keyword search

Online guides

Personal consultation For personal consultation please contact our technical hotline.

Service

Use the search function in the electronic version to nd the topics of interest for you quickly.

Our online guides provide detailed information on technical basics and terms.

If you have any problems with the device the customer service will gladly assist you.

Block-300B

General information

1.2 Notational conventions

This manual uses the following notational conventions:

Letterings

The letterings for connectors and controls are marked by square brackets and italics.

Examples: [VOLUME] control, [Mono] button.

1.3 Symbols and signal words

In this section you will nd an overview of the meaning of symbols and signal words that are used in this manual.

bass head

General information

Signal word Meaning

DANGER! This combination of symbol and signal word indicates an

immediate dangerous situation that will result in death or serious injury if it is not avoided.

CAUTION! This combination of symbol and signal word indicates a pos‐

sible dangerous situation that can result in minor injury if it is not avoided.

NOTICE! This combination of symbol and signal word indicates a pos‐

sible dangerous situation that can result in material and environmental damage if it is not avoided.

Warning signs Type of danger

Warning – high-voltage.

Warning – danger zone.

Block-300B

Safety instructions

2 Safety instructions

Intended use

This device is intended to be used for the amplication of signals from musical instruments with electromagnetic pickups. Use the device only as described in this user manual. Any other use or use under other operating conditions is considered to be improper and may result in personal injury or property damage. No liability will be assumed for damages resulting from improper use.

This device may be used only by persons with sucient physical, sensorial, and intellectual abilities and having corresponding knowledge and experience. Other persons may use this device only if they are supervised or instructed by a person who is responsible for their safety.

bass head

Safety

Safety instructions

DANGER! Danger for children

Ensure that plastic bags, packaging, etc. are disposed of properly and are not within reach of babies and young children. Choking hazard!

Ensure that children do not detach any small parts (e.g. knobs or the like) from the unit. They could swallow the pieces and choke!

Never let children unattended use electrical devices.

DANGER! Electric shock caused by high voltages inside

Within the device there are areas where high voltages may be present. Never remove any covers.

There are no user-serviceable parts inside.

Do not use the device if covers, protectors or optical components are missing or damaged.

Block-300B

Safety instructions

DANGER! Electric shock caused by short-circuit

Always use proper ready-made insulated mains cabling (power cord) with a pro‐ tective contact plug. Do not modify the mains cable or the plug. Failure to do so could result in electric shock/death or re. If in doubt, seek advice from a regis‐ tered electrician.

CAUTION! Possible hearing damage

The device can produce volume levels that may cause temporary or permanent hearing impairment. Over an extended period of time, even levels that seem to be uncritical can cause hearing damage.

Decrease the volume level immediately if you experience ringing in your ears or hearing impairment. If this is not possible, keep a greater distance or use su‐ cient ear protectors.

bass head

Safety instructions

NOTICE! Risk of re

Do not block areas of ventilation. Do not install the device near any direct heat source. Keep the device away from naked ames.

NOTICE! Operating conditions

This device has been designed for indoor use only. To prevent damage, never expose the device to any liquid or moisture. Avoid direct sunlight, heavy dirt, and strong vibrations.

Block-300B

Safety instructions

NOTICE! Power supply

Before connecting the device, ensure that the input voltage (AC outlet) matches the voltage rating of the device and that the AC outlet is protected by a residual current circuit breaker. Failure to do so could result in damage to the device and possibly injure the user.

Unplug the device before electrical storms occur and when it is unused for long periods of time to reduce the risk of electric shock or re.

NOTICE! Possible staining

The plasticiser contained in the rubber feet of this product may possibly react with the coating of your parquet, linoleum, laminate or PVC oor and after some time cause permanent dark stains.

In case of doubt, do not put the rubber feet directly on the oor, but use felt-pad oor protectors or a carpet.

bass head

3 Features

Features

This powerful bass head is characterized by the following special features:

n Compact, lightweight design n Output power: 300 watt @ 4 Ω n Class-D ICE power amp n 5-band equalizer n D.I. output with pre / post & lift / ground switch n Input sensitivity switchable for active or passive basses n Line input with volume control for rehearsing n Headphones output n Gigbag optionally available (item no. 194575)

Block-300B

Installation and starting up

4 Installation and starting up

Unpack and carefully check that there is no transportation damage before using the unit. Keep the equipment packaging. To fully protect the device against vibration, dust and moisture during transportation or storage use the original packaging or your own packaging material suitable for transport or storage, respectively.

Create all connections while the device is o. Use the shortest possible high-quality cables for all connections. Take care when running the cables to prevent tripping hazards.

bass head

5 Connections and operating elements

Front panel

Connections and operating elements

Block-300B

Connections and operating elements

1 [INPUT]

Preamp volume control. If the [CLIP] LED lights up red, this controller must be turned counter-clockwise until the LED turns green again. If some EQ band levels have been changed, re-adjusting the [ INPUT] control may be necessary.

2 [CLIP]

The LED lights up green when the device is turned on. It lights up red when the signal is clipping. Then turn the [INPUT] control counter-clockwise until the LED turns green again.

3 [BASS] / [LO MID] / [MIDDLE] / [HI MID] / [TREBLE]

Controls for raising or attenuating the bass / lower mids / mids / upper mids / treble

4 [OUTPUT]

Master volume control

3.5 mm jack output to connect head phones

3.5 mm jack input for connecting a line level player, e.g. MP3 player or mobile phone

bass head

Connections and operating elements

7 [LINE]

Volume control for the input

8 [EQ]

Enables or disables the EQ. Slider control is only possible if the EQ is enabled.

9 [HI/LOW]

Switch for the sensitivity and impedance of the [IN]. When using passive instruments, this switch should be in the [HI] position (not pressed), otherwise the input level is not sucient to fully drive the amplier. When using active instru‐ ments, this switch should be in the [LOW] position (pressed), otherwise clipping and thus a preamp overload can easily occur, resulting in very disturbing-sounding distortions.

10 [IN]

1/4" jack socket to connect an electric bass

Block-300B

Connections and operating elements

Rear panel

bass head

Connections and operating elements

11 [POWER]

IEC chassis plug for mains connection with fuse holder

12 [D.I.]

Balanced direct-output with MIC level for connection to a mixer, directly to a PA system or for recording

13 [SPEAKER OUT]

Speakon speaker output for connecting suitable speaker boxes. The overall impedance of the connected load must not fall below 4 Ω.

14 Housing fan

15 [PRE/POST]

This switch determines where the DI signal is tapped. In [PRE] position, the signal is tapped before tone control and compressor, in [POST] position behind it.

Block-300B

Connections and operating elements

16 [LIFT/GND]

This switch disconnects or connects the ground potential of the DI output and the device ground. In [LIFT] position (released), the device ground is disconnected. This can possibly eliminate noise caused by ground loops, that may occur when connecting the device to other grounded equipment. In [ GND] position (pressed), the device ground is connected.

17 Mains switch to turn the device on and o

bass head

6 Technical specications

Amp class Class-D ICE

Input impedance High 1.5 MΩ

Low 32 kΩ

Line 60 kΩ

Output impedance D.I. 470 Ω (balanced)

Frequency bands Bass 50 Hz +/– 10 dB

Lower mids 180 Hz +/– 10 dB

Mids 660 Hz +/– 10 dB

Upper mids 3 kHz +/– 10 dB

Treble 12.5 kHz +/– 10 dB

Output power Speaker max. 300 W, 4 Ω minimum load

Technical specications

Signal-to-noise ratio > 80 dB (A-weighted)

Block-300B

Technical specications

Total harmonic distortion (THD) < 0.5 %

Power consumption 390 W

Operating supply voltage

Fuse 5 mm × 20 mm, 4 A, 250 V, slow-blow

Dimensions (W × H × D) 200 mm × 80 mm × 200 mm

Weight 1.55 kg

Ambient conditions Temperature range 0 °C…40 °C

Further information

Gigbag Optional (item no. 194575)

Compressor No

Limiter No

100 - 240 V 50/60 Hz

Relative humidity 50 %, non-condensing

bass head

Eects processor No

External eects loop No

Rack format No

Technical specications

Block-300B

Plug and connection assignment

7 Plug and connection assignment

Introduction

Balanced and unbalanced trans‐ mission

This chapter will help you select the right cables and plugs to connect your valuable equip‐ ment in such a way that a perfect sound experience is ensured.

Please note these advices, because especially in ‘Sound & Light’ caution is indicated: Even if a plug ts into the socket, an incorrect connection may result in a destroyed power amp, a short circuit or ‘just’ in poor transmission quality!

Unbalanced transmission is mainly used in semi-professional environment and in hi use. Instrument cables with two conductors (one core plus shielding) are typical representatives of the unbalanced transmission. One conductor is ground and shielding while the signal is trans‐ mitted through the core.

Unbalanced transmission is susceptible to electromagnetic interference, especially at low levels, such as microphone signals and when using long cables.

In a professional environment, therefore, the balanced transmission is preferred, because this enables an undisturbed transmission of signals over long distances. In addition to the conduc‐ tors ‘Ground’ and ‘Signal’, in a balanced transmission a second core is added. This also transfers the signal, but phase-shifted by 180°.

bass head

1/4" TS phone plug (mono, unbalanced)

1/4" TRS phone plug (mono, bal‐ anced)

Plug and connection assignment

Since the interference aects both cores equally, by subtracting the phase-shifted signals, the interfering signal is completely neutralized. The result is a pure signal without any noise inter‐ ference.

1 Signal

2 Ground, shielding

1 Signal (in phase, +)

2 Signal (out of phase, –)

3 Ground

Block-300B

Plug and connection assignment

Three-pole 1/8" mini phone jack (stereo, unbalanced)

XLR plug (balanced)

1 Signal (left)

2 Signal (right)

3 Ground, shielding

1 Ground, shielding

2 Signal (in phase, +)

3 Signal (out of phase, –)

4 Shielding on plug housing (option)

bass head

8 Protecting the environment

Disposal of the packaging mate‐ rial

For the transport and protective packaging, environmentally friendly materials have been chosen that can be supplied to normal recycling.

Ensure that plastic bags, packaging, etc. are properly disposed of.

Do not just dispose of these materials with your normal household waste, but make sure that they are collected for recycling. Please follow the notes and markings on the packaging.

Disposal of your old device

This product is subject to the European Waste Electrical and Electronic Equipment Directive (WEEE) in its currently valid version. Do not dispose with your normal household waste.

Dispose of this device through an approved waste disposal rm or through your local waste facility. When discarding the device, comply with the rules and regulations that apply in your country. If in doubt, consult your local waste disposal facility.

Protecting the environment

Block-300B