Arcarti Delta 2 Loudspeaker
Handbook
Arcam Delta 2 Loudspeaker
Instructions for use
Introduction
Thank you for buying the Arcam Delta Two loudspeakers.
These loudspeakers have been designed to produce a high standard of
sound reproduction at an affordable price. Although suitable for use with
any good quality hi-fi equipment, the speakers are an excellent sonic and
physical match for the rest of the Arcam Delta range of electronics. They
also work well with our entry level Arcam Alpha amplifier.
Installation Instructions
Positioning
For optimum results these speakers should be placed on
rigid stands 15 to 40cms from a rear wall and at least 60cms (2 feet) from
any side wall. They should never be used on the floor or in corners.
The final sound will of course depend on the acoustics of
the listening room, and experimentation with speaker positioning and
furnishings is definitely worthwhile. As a starting point we suggest that the
speakers should be placed 2.4 - 3m (8-10 feet) apart with their backs
lOcms (4 inches) from the rear wall. The bass output may then be raised
or lowered by moving the speakers closer to or further away from the
wall. Toeing-in the speakers, so that their axes cross just in front of the
listener may also be benificial to treble balance and stereo imagery.
Loudspeaker Stands
The more firmly a speaker is held, the better it will sound.
The Arcam STM3 stand is matched to the requirements of the Delta Two
and is available from your Arcam dealer.
Alternatively, use rigid metal stands of 40-60cms (14-24 _
inches) height. Properly damped types that do not "ring" when tapped
with a pencil, either by virtue of construction, or by filling with dry silver
sand, will bring out the best in the loudspeaker.
It is possible to obtain a good sound balance when shelf
mounting the Delta Two (though stands are recommended tor optimum
performance). The rear of the loudspeakers should be no less than
50mm from the wall to allow free flow of air from the reflex port and it
should be mounted at least 450mm from a corner and 600mm from the
floor (these distances may be interchanged if more convenient).
Speaker Cables
The speakers should be connected to the amplifier using
good quality, high purity copper cables with a cross sectional area of at
least 1 mm2 per conductor. Solid core cables or those with surface only
conductors are particularly suitable. Bell wire and very cheap or giveaway
speaker cables should be avoided - they are a false economy and can
badly degrade the sound quality. Neither do we recommend the use of
fat, heavily stranded cables, as these often impart a harsh and hashy
sound to the system. We recommend AudioQuest cables. Your dealer
will be able to give you advice on the differences between the various
models available.
The cable runs to the two speakers should be of roughly
equal length and yet as short as practicable (a long run of speaker cable
always sounds worse than a short one). The usual care should be taken
over speaker phasing. Both loudspeakers should be connected to the
amplifier with the same phase (black to black and red to red). All speaker
cables will be colour coded or have some physical identification (such a
small "rib" along one wire) to aid correct phasing.
Bi-wiring
Bi-wiring loudspeakers is a cost effective way of improving
the sound quality of a hi-fi system. The bi-wiring principle involves
electrically isolating the treble and bass sections of the loudspeaker’s
crossover network and bringing out the connections to four, rather than
two, terminals on the back panel. The use of separate cables to each half
of the crossover then enables the complete isolation of the signals fed
from the amplifier to the treble and bass speaker units. A reduction in
low level intermodulation and crosstalk effects is achieved, resulting in a
cleaner sound with improved imaging and separation o* instruments.
page 2
Arcam Delta 2 Loudspeaker
choice of the cable types for bass and treble signals. As a general guide
Further improvements may also be gained by careful
bass will usually benefit from a heavier gauge cable and treble from a
cable of smaller cross-section. However, cable construction as well as
size plays an important part in its behaviour at high and low frequencies.
To bi-wire a loudspeaker first remove the two links
between the pairs of red and black terminals on the rear of the speaker
and then connect two separate cable runs to the bass and treble
inputs. These cables should then be commoned (i.e. connected together)
at the amplifier's output terminals. This may be done by connecting both
cables into a single pair of 4mm plugs or, if the amplifier has binding
posts, by making common bare wire or spade connections to the
terminals.
Care must be taken to ensure that all individual
loudspeaker units are connected in the same phase (i.e. connect
terminals RED to RED and BLACK to BLACK). If this is not done serious
frequency response deviations will result.
Power Handling
The Arcam Delta 2 loudspeakers are designed to
reproduce recorded music under normal domestic conditions. We do not
recommend nor warrant them tor use in any form of sound reinforcement
application or at discotheques, parties or other forms of speaker
demolition derby.
Bearing this in mind the loudspeakers will perform well
and safely with hi-fi amplifiers rated at between 20 and 70 watts per
channel. However care must always be taken to avoid amplifier overload
or "clipping". Apart from possible damage to the amplifier this can and
does damage loudspeakers. In this respect, an overdriven low powered
amplifier is much more likely to cause damage than a properly used high
powered one.
Technical Specifications
System design:
Two way reflex loudspeaker, 14 litres internal volume.
Cabinet solidly constructed from 18mm board with a
19mm Medite front baffle, braced and optimally damped.
Drive units:
180mm Polypropylene coned bass / mid range unit with
a diecast chassis.
20mm soft domed tweeter.
Crossover:
High performance 8 element design. 3kHz, 12dB / octave.
Connections:
4mm sockets / binding posts on rear.
Frequency range:
40Hz to 20kHz
Impedance:
8ohms nominal (6.5ohms minimum).
Sensitivity:
88dB / Watt measured at 1 m.
Amplifier Compatibility:
15 to 70W, under normal operating conditions.
Finish:
Real wood veneers. Black Ash or Walnut.
Dimensions:
223 X 281 X 378mm (width x depth x height).
Weight:
Net 8.5kgs each.
Packed: 20 kgs. / pair.
page 3
Arcam Delta 2 Loudspeaker
Guarantees
These speakers are guaranteed under the conditions
which apply in the country of purchase. Any guarantee wili not affect the
customer's statutory rights.
Guarantee for UK sales
This equipment has been fuiiy tested and a fuil record of
these tests made before despatch from the factory. Both the
workmanship and the performance of this equipment are (except as set
out below) guaranteed against defects for a period of two years from the
date of purchase, provided that it was originaiiy purchased from an
authorised UK deaier under a consumer saie agreement. (The words
"consumer saie" shall be construed in accordance with Section 15 of the
Supply Of Goods (Implied Terms ) Act 1973).
The manufacturers can accept no responsibiiity for defects
arising from accident, misuse, abuse, wear and tear, negiect or through
unauthorised adjustment and/or repair, neither can they accept
responsibility for damage or loss occuring during transit to or from the
person claiming under this guarantee. This guarantee covers both iabour
and parts, and is transferabie to subsequent purchasers, but the iiabiiity
of the manufacturers is limited to the cost of repair or repiacement of the
defective parts (at the discretion of the manufacturers) and under no
circumstances extends to consequentiai ioss or damage.
Claims under this guarantee
This equipment should be packed in the originai packing
and returned to the deaier from whom it was purchased or, faiiing this, to
any other authorisec) Arcam dealer. If it is not possibie to return the
equipment by hand, then it shouid be sent carriage prepaid by a
reputabie carrier.
If the original packing is not avaiiabie, repiacement
packing can be purchased from the manufacturers. The equipment
shouid not be sent by post.
UNLESS YOU HAVE BEEN SPECiFiCALLY REQUESTED TO DO SO
DO NOT CONSiGN THE EQUiPMENT TO ARCAM
BY THE MANUFACTURERS TECHNiCAL SALES OR SERViCE
DEPARTMENTS.
DO NOT UNDER ANY CiRCUMSTANCES ATTEMPT TO
DiSASSEMBLE THE EQUiPMENT BEFORE DESPATCH.
if you have any difficuity compiying with these
requirements, piease contact the manufacturers at the foiiowing address:
ARCAM
Pembroke Avenue,
Denny industriai Centre,
Waterbeach,
Cambridge,
CBS 9PB.
Teiephone: ( 0223 ) 440964
Fax: ( 0223 ) 863384
in either case you shouid state cieariy your name and
address, the date and place of purchase together with a brief description
of the fault.
In the event of equipment being returned which, after
having been tested, is found to compiy with the published specification,
the manufacturers reserve the right to charge a reasonabie fee for testing
the equipment, and for the return carriage.
Enquiries
The manufacturers are happy to answer any queries you
may have regarding the use of this equipment on the condition that this
enquiry is by letter and a stamped addressed envelope is provided. You
shouid state cieariy the serial number of the unit, the dealer from whom it
was purchased, and the date of purchase.
THiS GUARANTEE iN NOWAY VARIES OR REMOVES
A PURCHASER'S STATUTORY RIGHTS.
page 4
Part No. SH020A March 1991
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