Owner's Manual

ELECRAFT



SP4 Speaker

OWNER’S MANUAL

Introduction

The SP4 is a high-quality, front-facing speaker that complements Elecraft’s K4 both aesthetically and

functionally. It can be used with any receiver capable of driving a 4-ohm load. The speaker is passive (non-

amplified), minimizing susceptibility to RFI in the presence of a transmitted signal. The SP4’s custom-built,

wide-range driver has excellent sensitivity and deep bass response.

The A/B switch on the front panel of the SP4 can be used to select one of two mono sources. Further, when used

in conjunction with a second SP4 this switch can be used to select one of two stereo sources. The Elecraft K4

transceiver takes full advantage of this feature, since it provides a rich binaural audio effect (AFX), as well as

user-adjustable left/right balance between main and sub receiver audio.

Rear-panel input jacks accept either mono or stereo cables, simplifying station wiring. An output jack is

provided for connection to a second SP4. When two SP4s are used, the A/B switch on the first unit controls

source selection for both.

Specifications

Dimensions

The tilt stand height matches the Elecraft K4 transceiver and the KPA1500 Amplifier.

Allow an additional 2" (5 cm) space behind unit for rear panel connectors.

Weight: 5 lb, 6 oz (2.5 kg)

Speaker Size: 3” x 5” (77 x 127 mm)

Speaker Impedance: 4 ohms

Magnet Type: Neodymium

Power Handling Capability: 15 W

Frequency Response: 100-20,000 Hz

Sensitivity: 90 dB SPL

PAGE 1
ELECRAFT SP4 Speaker OWNER’S MANUAL Introduction The SP4 is a high-quality, front-facing speaker that complements Elecraft’s K4 both aesthetically and functionally. It can be used with any receiver capable of driving a 4-ohm load. The speaker is passive (nonamplified), minimizing susceptibility to RFI in the presence of a transmitted signal. The SP4’s custom-built, wide-range driver has excellent sensitivity and deep bass response.
PAGE 2
Setup One cable is provided with your SP4 to connect it to a K4 transceiver as described under Monaural Setup with One SP4 below. The SP4 connectors accept standard two-circuit (stereo) audio cables with 3.5 mm male connectors. Monaural Setup with One SP4  Connect the SPKRS jack on the K4 rear panel to either the INPUT A or INPUT B jack on the SP4 using the stereo cable provided.  If you have a second K4, use a second stereo cable to connect it to the remaining input at the SP4.
PAGE 3
Customer Service and Support Technical Assistance You can send e-mail to support@elecraft.com and we will respond quickly - typically the same day Monday through Friday. Telephone assistance is available from 9 A.M. to 5 P.M. Pacific time (weekdays only) at 831763-4211. Please use e-mail rather than calling when possible since this gives us a written record of the details of your problem and allows us to handle a larger number of requests each day.