Soundstream Technologies SPL 170 owner manual Vented, Sealed Bandpass SBP

Vented (Continued)

∙4.5 ft3 @ 25 Hz (Two

4" x 16" ports) -

D e s i g n e d	f o r
thunderous	home

theater bass. Use with 20 Hz high pass filter for very high power handling.

	105
	100
	95
	90
	85
dB	80
	75
	70
	65
	60
	55
	50
	10	100	1000

Frequency Hz

Vented (V)

HEAT TRANSFER AND THE

SPL170 -- 30 % BETTER COOLING

One of the major features of the SPL170 is its incorporation of materials and coatings to provide transfer and elimination of heat.

∙When heat is produced in the voice coil, it must be removed. During speaker operation, heat from the voice coil is radiated and convected into the air and metal in the motor parts.

∙The SPL170 includes unique aluminum plates attached to the top, pole and back plates to increase heat conduction from the steel parts. Additionally, the steel parts are black coated to increase their ability to absorb heat from the voice coil.

Sealed Bandpass

∙Rear = .87 ft3 sealed

∙Front = 1.5 ft3 @ 75

Hz	(Five	4" x	10"
ports)	-	Very	high
o u t p u t		i n	t i n y
enclosure.		Great for
SPL	vehicles --		102
dB with		2.83	volts
input!		Response

limited to 45 to 100 Hz.

∙Rear = 1.2 ft3 sealed

∙Front = 1.5 ft3 @ 62 Hz (Three 4" x 10" ports) - High output with response to 35 Hz. Good enclosure for Rock and Rap music. 100 dB with 2.83 volts input.

∙Rear = 2 ft3 sealed

∙Front = 1.5 ft3 @ 53

	105
	100
	95
	90
	85
dB	80
	75
	70
	65
	60
	55
	50
	10	100	1000

Frequency Hz

	105
	100
	95
	90
	85
dB	80
	75
	70
	65
	60
	55
	50
	10	100	1000
		Frequency Hz

	105
	100
	95
	90
	85
dB	80
	75
	70
	65
	60
	55
	50
	10	100	1000
		Frequency Hz

Sealed Bandpass (SBP)

ALUMINUM

COOLING

PLATES

Tests show almost 30% improved heat transfer from the 170’s voice coil. This produces a dual benefit to power handling and output:

1.More power handling before voice coil meltdown.

2.Reduced electrical resistance in the voice coil windings resulting in more current flow capability.

Footnote: The Physics of Heat Transfer

Heat energy, q, radiated between two bodies is determined by the formula:

SPECIAL APPLICATION NOTE:

The three enclosures above have been designed with flexibility in mind. One single enclosure could be constructed to utilize all three response curves. An adjustable rear volume and port "covers" could allow use of all three

q1-2= σεA1F1−2(T14−T24)

An important part of this equation is e which is the “emissivity”. The largere is, the more heat transfer takes place. ε is largest for a black surface (1.0). That’s why wood stoves and car radiators are painted black.

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