bhi GB8M, GB8S, GB600S, GB10KS, GB600M User Guide

GroundBreaker

Audio Isolation Unit User Guide

bhi Ltd, PO Box 318, Burgess Hill, RH15 9NR England.

Tel: [phone] – Email: [e-mail] – Web: www.bhi-ltd.com

The bhi GroundBreaker unit isolates the grounds on your ancillary equipment from those of the
radio system, removing ground loops and associated RFI problems from getting into your audio.

Note: Ensure that you have the correct bhi GroundBreaker unit to suit your connections and
impedance.

Installation

The bhi GroundBreaker is easy to use and simply connects between your radio and audio
DSP/ancillary equipment using 3.5mm connections. The unit works both ways round.
The GroundBreaker can also be used to isolate headphones when plugged into the
headphone socket on the radio.

Balanced to Unbalanced audio systems

Most audio amplifiers used in radios are Class A or AB. They normally have a single ended
(unbalanced) output that works against ground, however, some manufacturers have started
using balanced audio amplifiers and Class D (switch mode) amplifiers. These present a
different problem as most audio ancillary products on the market (unless they are for
professional audio) use unbalanced inputs. The GroundBreaker can be used to isolate the
balanced audio output of the set and allow the ancillary unbalanced input to be unaffected.

Maximum Power Handling

The GroundBreaker does have limits to its power handling. The 600 Ohm and 10k Ohm
devices are capable of handling the normal audio levels that can be found in most audio
systems. The 8 Ohm device is only meant to be used at powers up to 0.5 Watts to allow
interfacing to most bhi audio DSP products and is not meant for the transfer of power into un­powered speaker units. So the GroundBreaker should only be connected between the
extension speaker output of the radio or audio equipment and the input of the bhi DSP unit.

Product Code

Type

Maximum power

GB8M

3.5mm 8 Ohm Mono

500mW

GB600M

3.5mm 600 Ohm Mono

100mW

GB10KM

3.5mm 10 k Ohm Mono

100mW

GB8S

3.5mm 8 Ohm Stereo

500mW/Channel

GB600S

3.5mm 600 Ohm Stereo

100mW/Channel

GB10KS

3.5mm 10 k Ohm Stereo

100mW/Channel

bhi Ltd, PO Box 318, Burgess Hill, RH15 9NR England.

Tel: [phone] – Email: [e-mail] – Web: www.bhi-ltd.com

Select the relevant GroundBreaker unit above to suit your connection type and impedance.

WEEE Statement

Weee Statement for correct disposal of this product: (Applicable in the European
Union and other European countries with separate collection systems). This marking
shown on the product or its literature, indicates that it should not be disposed of with

other household wastes at the end of its working life. To prevent possible harm to the
environment or human health from uncontrolled waste
disposal, please separate this from other types of wastes and recycle it responsibly to promote
the sustainable reuse of material resources. Household users should contact either the retailer
where they purchased this product, or their local government office, for details of where and
how they can take this item for environmentally safe recycling. Business users should contact
their supplier and check the terms and conditions of the purchase contract. This product should
not be mixed with other commercial wastes for disposal.