SP15 Surround & Center

The SP15 surround and the SP15c center channel speakers were designed for multichannel cinema application. They have an omnidirectional dispersion pattern precisely for covering a wide listening area. The point is to deliver broad, equally balanced sound to every listener in the room, not just the one person sitting smack in the center.

Surround channels are for recreating ambient sound effects. This is best done when the speakers are non-directional. With up-firing drivers most of the sound is indirect, reflected and diffused. This envelopes listeners in a more encompassing soundfield.

The center channel speaker is shorter to provide more direct sound, but also to place it just at the edge of the video screen, allowing dialog to sound more like it's coming from the actors mouths rather than from a speaker above or below the image.

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Most of the time the demand on center and surround speakers is low. Dialog isn't demanding; surround effects are fleeting. But there are times when the program calls for more. Minimum requirements must be exceeded. If the speakers draw attention to themselves because they are too obviously locatable or driven to distortion, they won't be performing their duties up to the required standards.

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Surround speakers should be audibly 'invisible.' The SP15s have the power handing necessary and the non-direct, omnidirectional dispersion to readily fool the ear into believing the surround channel effects are right there in the room with you.

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More on Ambient Soundfield Reproduction

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Specifications
SP15 & SP15c
Description single driver sealed acoustic suspension
Driver 1 - 15 cm (5.5") Seas ER15 RLY
Enclosure Volume
surround
16.0 L / Qtc 0.45
center
11.9 L / Qtc 0.48
Power Rating 20 watts / 60 watts cont./ 250 max.
Impedance 8 ohm nom. / 5.6 min.
AVR Crossover 80 Hz, set surround to "small" - set center to "large"
Room Size & Placement suitable for typical room sizes up to approximately — 140 kl / 5000 cubic ft. or 6m x7.5m x3m / 20'x25'x10'

90°-110° to the side of the seating area

center channel at bottom edge of video screen

2 pair of surrounds recommended for larger rooms or 7.1 audio - surround rear placed at 130°-150°

Frequency Response
surround
+/- 2.5 dB 50 Hz - 8000 Hz in room - 90°off-axis
center
+/- 2.5 dB 50 Hz - 8000 Hz in room - 75°off-axis
Sensitivity 91.5 dB
Dimensions
surround
93.7cm x 22.9cm / 36.875" x 9.0"
center
70.8cm x 22.9cm / 27.875" x 9.0"
Weight
surround
9.5 kg / 21 lbs.
center
7.7 kg / 17 lbs.
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