Peavey 1508-4sps BWX 1508he, 1208sps, Enclosures, Parameter Definitions, Parameters, 1508sps

The 1508he is best used as the bottom end of a full range enclosure. It has very high efficiency for superior output in the mid-bass and mid-range. However, for pure subwoofer applications, the 1508sps or 1508cu are better choices.

The 1208sps works well in sealed or vented enclosure designs, and its smooth, extended frequency response makes it an excellent mid-range performer. It is available in 4 and 8 Ohm versions.

Because the 1208sps’s low frequency output is limited, it should be used along with a subwoofer when response below 60 Hz is needed. The best application for the 1208sps is in compact enclosures and very high quality mid-bass/mid-range reproduction at high sound pressure levels.

The 15" drivers can work with crossover points as high as 2.0 kHz but work best below 1.5 kHz. The 12" drivers are usable to 3.5 kHz but perform best below 2.5 kHz.

ENCLOSURES

To assist with the growing interest in home-built enclosure designs, Peavey provides complete parameter data on these drivers as well as several recommended enclosures for each

Vents used in the examples require standard Schedule 40 PVC pipe for vent construction. The pipe should be dadoed tightly into the back of the baffle and glued firmly in place with high quality epoxy or high strength industrial grade hot glue. Rough up the outside of the pipe to improve the glue bond.

Be sure to account for the displacement of the vent, bracing, horn (if used) and woofer or your enclosure before building it, or it will be smaller than its intended volume. This can reduce bass output and mis-tune the enclosure.

Line the inside of the enclosure with polyester fiber batting such as quilt stuffing. The batting material should conform to California bedding fire codes. Attach the batting with spray adhesive or staples, and keep it away from the end of the vent tube where it could be pulled in by air flow. Handles, protective corners, cabinet covering, grille materials and crossovers are available through Peavey Accessories.

When building a bandpass enclosure, design a panel or door to be removable for access to the woofer. Use foam weather-strip to seal the panel along with enough screws and bracing to prevent leaks and buzzes. Fill the sealed volume loosely with polyester fiber, but leave the

enclosure together for optimum performance in any application.

PARAMETER DEFINITIONS

Znom: The nominal impedance of the driver in Ohms.

Revc: DC resistance of the driver in Ohms. Also known as Re.

Sd: The functional radiating surface area of the cone assembly, in meters2.

BL: Efficiency of the voice coil and magnet system in Telsa Meters.

Fo: Also known as Fs, the free air resonance of the driver.

Vas: Volume of air having the same

compliance (springiness) as the driver’s suspension.

Cms: Restorative force of the driver’s suspension in micrometers/Newton.

Mms: The total mass of the moving

parts of the loudspeaker, including the air load, in grams.

Qms: Resonance characteristics of the mechanical factors of the loudspeaker.

Qes: Resonance characteristics of electrical factors of the loudspeaker.

SPECIFICATIONS

Model Name:	1508-8sps	1508sps-4	1508-8cu	1508-8he	1208-8sps	1208-4sps
Part #:	00452850	00452860	00452870	00457680	00452830	00452840
Size: inches/mm	15" / 380 mm	15" / 380 mm	15" / 380 mm	15" / 380 mm	12" / 305 mm	12" / 305 mm
	nominal	nominal	nominal	nominal	nominal	nominal
	Frame OD 15-	Frame OD 15-	Frame OD 15-	Frame OD 15-	Frame OD 12-	Frame OD 12-
	1/4" / 387 mm	1/4" / 387 mm	1/4" / 387 mm	1/4" / 387 mm	1/4" / 311 mm	1/4" / 311 mm
	Bolt circle	Bolt circle	Bolt circle	Bolt circle	Bolt circle	Bolt circle
	14-9/16"	14-9/16"	14-9/16"	14-9/16"	11- 5/8"	11- 5/8"
	370 mm, 8 holes	370mm,8holes	370 mm, 8 holes	370 mm, 8 holes	295 mm, 8 holes	295 mm, 8 holes
	Cutout diameter	Cutout diameter	Cutout diameter	Cutout diameter	Cutout diameter	Cutout diameter
	14" / 356 mm	14" / 356 mm	14" / 356 mm	14" / 356 mm	10 15/16" / 278 mm	10 15/16" / 278 mm
	Depth 4-31/32"	Depth 4-31/32"	Depth 4-31/32"	Depth 4-31/32"	Depth 3-17/32"	Depth 3-17/32"
	126 mm	126 mm	126 mm	126 mm	90 mm	90mm
Impedance:	8 Ohms	4 Ohms	8 Ohms	8 Ohms	8 Ohms	4 Ohms
Power Capacity:	2000 W peak	2000 W peak	2000 W peak	2000 W peak	2000 W peak	2000 W peak
	1000 W program 1000 W program		1000 W program	1000 W program	1000 W program	1000 W program
	500 W continuous	500 W continuous	500 W continuous	500 W continuous	500 W continuous	500 W continuous
	per AES 2-1984,	per AES 2-1984,	per AES 2-1984,	per AES 2-1984,	per AES 2-1984,	per AES 2-1984,
	50 Hz - 500 Hz	50 Hz - 500 Hz	50 Hz - 500 Hz	50 Hz - 500 Hz	65 Hz - 650 Hz	65 Hz - 650 Hz
Sensitivity:	96.7 dB 1 Watt /	97.5 dB 1 Watt /	97.2 dB 1 Watt /	100.3 dB 1 Watt /	96.9 dB 1 watt /	96.6 dB 1 watt /
	1 meter	1 meter	1 meter	1 meter	1 meter	1 meter
Usable
frequency range:	35 Hz ~ 2 kHz	35 Hz ~ 2 kHz	35 Hz ~ 2 kHz	40 Hz ~ 2 kHz	50 Hz ~ 3.5 kHz	50 Hz ~ 3.5 kHz
Cone:	Kevlar®	Kevlar	Kevlar	Kevlar	Kevlar	Kevlar
	impregnated	impregnated	impregnated	impregnated	impregnated	impregnated
	cellulose	cellulose	cellulose	cellulose	cellulose	cellulose
Voice coil diam:	4.0" / 100 mm	4.0" / 100 mm	4.0" / 100 mm	4.0" / 100 mm	4.0" / 100 mm	4.0" / 100 mm
Voice coil material:	Aluminum ribbon	Aluminum ribbon	Copper ribbon	Aluminum ribbon	Aluminum ribbon	Aluminum ribbon
	wire	wire	wire	wire	wire	wire
	Polyimide-	Polyimide-	Polyimide-	Polyimide-	Polyimide-	Polyimide-
	impregnated	impregnated	impregnated	impregnated	impregnated	impregnated
	fiberglass	fiberglass	fiberglass	fiberglass	fiberglass	fiberglass
	former	former	former	former	former	former
	Nomex® stiffener Nomex stiffener		Nomex stiffener	Nomex stiffener	Nomex stiffener	Nomex stiffener

SUGGESTED ENCLOSURES

For those who want to build their own enclosures, but don’t want to go through the design process using driver parameters, we provide the following optimized designs:

FOR 1508-4/8sps:

Sealed enclosure

May be preferred for stage monitors to control boominess and low frequency feedback on stage. F3 is 73 Hz.

Small vented enclosure

Excellent performance for compact, general purpose use. Warm mid-bass response. F3 is 51 Hz.

Medium vented enclosure

Terrific compromise of bass performance and enclosure size. Warm mid-bass response. F3 is 45 Hz.

Large vented enclosure

Big box, big bass! Great response as a subwoofer or the bottom end of a large multi-way enclosure design. F3 is 41 Hz.

Single reflex bandpass enclosure

Special enclosure design that uses the enclosure as an acoustic filter for shaped response. Great choice for a compact subwoofer system. Response is 48 Hz – 138 Hz.

FOR 1508-8cu:

Small vented enclosure

An incredibly small enclosure with outstanding bass performance for its size. F3 is 53 Hz.

Medium vented enclosure

Small box with powerful bass and predictable, flat response down to an F3 of 45 Hz.

Large vented enclosure

Strong, flat response with bass extension to an F3 of 41 Hz. Deep, predictable bass quality for great subwoofer and multi-way system performance.

FOR 1508-8he:

Small vented enclosure

Small box, big voice. Very high efficiency and good bass performance in a small enclosure. F3 is 60 Hz.

Medium vented enclosure

Super-high efficiency in a popular enclosure size. F3 is 55 Hz. Great choice for use in a full-range system.

Large vented enclosure

Big and loud! Super efficiency and strong bass performance to an F3 of 50 Hz. However, for subwoofer-only use the sps and cu versions which are better performers.

FOR 1208-4/8sps:

Sealed enclosure

Excellent choice for a dedicated mid-bass/mid-range in a multiway system, or stage monitor. F3 is 105 Hz.

Small vented enclosure

Very small system with excellent voice range perforance. Great choice as the mid-range of a sub/satellite system. F3 is 79 Hz. Also good for use in a stage monitor.

Large vented enclosure

Still not all that large, with very usable bass response. Great for a compact, 2-way box. F3 is 61 Hz.

model. This information and much more can be found at www.peavey.com.

Enclosures should be built of best-quality 3/4" marine or other high grade plywood. Particle board and MDF enclosures can be easily damaged and are not recommended for portable applications, but may be acceptable for permanent installation. If construction plywood must be used, inspect each sheet thoroughly and use at least BC grade.

Use a quality wood glue, fit joints tightly, and add internal bracing to stiffen the panels of the enclosure. Look at commercially designed enclosures for ideas on good brace placement. Use wood screws or a pneumatic nailer to assemble the enclosure during gluing, to maximize joint strength.

Strength of the completed enclosure has a great effect on the bass performance of the finished system. Box panels that aren’t stiff enough will vibrate – cancelling bass produced by the woofer, and creating undesired sounds of their own. If your box vibrates or you don’t think the box panels are stiff enough, add more bracing.

vented volume empty. Place the magnet of the woofer in the vented side for improved cooling.

Peavey does not supply hardware required for the manufacturing of flying systems, and recommends that builders should not suspend or fly any enclosure not certified for such applications.

These instructions are a general guideline for design. Proper construction techniques, good planning and common sense will result in a reliable, high quality, high performance system.

Peavey in no way accepts liability for any damage, accidents or injury that may result from construction or use of enclosures using this information.

Features and specifications are subject to change without notice.

PARAMETERS

Thiele-Small parameters for Black Widow® 1208 and 1508 drivers follow. This data is for use in designing enclosures. Numerous software packages are available that use this data to simulate the response of the driver and

Qts: Resonance characteristics of the

electrical and mechanical factors combined together.

Xmax: Distance the cone can move in

one direction before the coil begins to leave the magnetic gap.

Le: Inductance of the voice coil in millihenries.

SPL: Typical sound pressure level at 1 Watt, 1 meter.

no: Electrical-to-acoustical conversion efficiency in percent.

Vd: Air displacement of the driver

from negative Xmax to positive Xmax, in milliliters.

Pmax: Maximum continuous program power in Watts.

Disp: Volume displaced by the driver inside the cabinet when mounted on its rear flange, in inches3.

Kevlar® is a registered trademark of DuPont.

Rubatex® is a registered trademark of Rubatex Corporation.

Nomex® is a registered trademark of DuPont.

	Solderless	Solderless	Solderless	Solderless	Solderless	Solderless
	diffusion welded	diffusion welded	diffusion welded	diffusion welded	diffusion welded	diffusion welded
	OFHC copper	OFHC copper	OFHC copper	OFHC copper	OFHC copper	OFHC copper
	leads	leads	leads	leads	leads	leads
Net weight:	17 lbs. / 7.7 kg	17 lbs. / 7.7 kg	17 lbs. / 7.7 kg	17 lbs. / 7.7 kg	16 lbs. / 7.3 kg	16 lbs. / 7.3 kg
Driver Parameters
Znom(Ohms)	8	4	8	8	8	4
Revc (Ohms)	5.27	3.30	5.91	5.32	5.43	3.47
Sd (M2)	0.084	0.084	0.084	0.084	0.052	0.052
BL (T/M)	15.37	12.72	20.84	16.04	15.13	14.09
Vas (liters)	185.9	163.6	199.6	182.4	54.6	66.2
Fo, Hz.	41.9	45.9	36.7	51.2	56.1	55.4
Cms (uM/N)	158.5	163.3	199.2	182	142.2	172.5
Mms (gm)	77.6	73.5	93.9	52.9	50.7	47.9
Qms	10.357	11.197	9.314	10.604	9.513	7.085
Qes	0.457	0.433	0.295	0.352	0.448	0.311
Qts	0.437	0.417	0.286	0.341	0.428	0.298
Xmax (mm)	4.7	2.3	4.7	1.9	4.7	2.3
Le (mH)	0.418	0.211	0.583	0.336	0.359	0.186
SPL (1W 1m)	96.7	97.5	97.2	100.3	96.9	96.6
no (%)	2.9	3.6	3.3	6.7	3.1	2.9
Vd (milliliters)	789	386	789	319	488	302
Pmax (w. pgm.)	1000	1000	1000	1000	1000	1000
Disp in3 / ml	197 / 3229	197 / 3229	197 / 3229	197 / 3229	109 / 1797	109 / 1797

1508sps
	1 5 0 8 s p s s e a l e d b o x
	1 5 0 8 s p s s m a l l v e n t e d b o x
	1 5 0 8 s p s m e d i u m v e n t e d b o x
	1 5 0 8 s p s l a r g e v e n t e d b o x
S P L , d B	1 5 0 8 s p s s i n g l e r e f l e x b a n d p a s s
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5
6 0	5 0	1 0 0	Hz	5 0 0	1 K
1 0 F r e q u e n c y , H z

1508he
		1 5 0 8 h e s m a l l v e n t e d b o x
		1 5 0 8 h e m e d i u m v e n t e d b o x
S P L ,	d B	1 5 0 8 h e l a r g e v e n t e d b o x
1 0 5
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5	F r e q u e n c y , H z	5 0	1 0 0	Hz	5 0 0	1 K
1 0

1508-8cu
		1 5 0 8 - 8 c u s m a l l v e n t e d b o x
		1 5 0 8 - 8 c u m e d i u m v e n t e d b o x
S P L ,	d B	1 5 0 8 - 8 c u l a r g e v e n t e d b o x
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5
6 0	F r e q u e n c y , H z	5 0	1 0 0	Hz	5 0 0	1 K
1 0

1208sps
		1 2 0 8 s p s s e a l e d b o x
		1 2 0 8 s p s s m a l l v e n t e d b o x
S P L , d B		1 2 0 8 s p s l a r g e v e n t e d b o x
1 0 5
1 0 0
9 5
9 0
8 5
8 0
7 5
7 0
6 5	F r e q u e n c y , H z	5 0	1 0 0	Hz	5 0 0	1 K
1 0