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TL880P

Very-Low-Frequency

Powered Speaker

System

Digital  Capable(TM) designed expressly to meet

the dynamic and low-frequency potential of
digital sound on film
THX approved’

Side-mounted connection panel facilitates
hookup when depth behind the screen is

restricted

Two EVX-180A 18-inch woofers, rated at 2,000
watts of combined continuous program power,

provide very high low-irequency pumping ability

to 

below 23 Hz

Unusually exlended 

LF response also appropriate

for very-low-frequency synthesized effects,  down-
tuned bass guitars or pipe organ
Internal, P1250 power amp delivers 1,200  watts
continuous to the loudspeakers

On-board P1250 processing provides “step-down”
ED, limiting to prevent amp clipping under high-
output conditions, and infrasonic speaker
protection

‘THX is a registered trademark of Lucasfilm Ltd.

Description and Applications

The Electro-Voice TL880P  is a member of

the TL series of low-frequency enclosures.

The TL880P is a powered subwoofer de-

signed expressly for digital sound on film

and other applications which require very

high low-frequency pumping ability ex-

tending to 25 Hz and below. The TL880P

features an Electra-Voice P1250  power am-

plifier, set up in bridge mode driving two

EVX-180A 457-mm

 (1

 8-in.) speakers, with

a combined rating of 2,000 watts continu-

ous program, connected in parallel. The

P1250  can deliver 1.200 watts continuous

(20-20,000  Hz) to the resultant 4-ohm load.

The P1250  has on-board signal processing

which supplies:

1. Low-frequency equalization nec-

essary for “step-down” operation

of the loudspeaker system, pro-

viding an overall system response

whose 3-dB-down  point 

 is 23 Hz.

2 .   I n f r a s o n i c   p r o t e c t i o n   o f   t h e

EVX- 180A-s below the P1250’s

peak boost frequency of 26 Hz.

3. Output limiting that prevents ampli-

fier clipping under high-output con-

ditions.

The side-mounted input for the amplifier

facilitates behind-the-screen installation,

where limited space between the screen and

theatre wall often makes it difficult to con-

nect to the back of an enclosure.

Directivity

In addition to motion-picture applications, the

TL880P is highly appropriate as the subwoofer

in large, multiway systems for contemporary

music playback and sound reinforcement. The

TL88OP  has more output below 40 Hz than the

devices typically used in these applications, in

either the normal (25 Hz) or alternative

(30 Hz) box tuning (see Alternative Vent Tun-

ing and Equalization Options section). Thus.

the TL880P  is not only appropriate for the

more typical 40-Hz-and-above subwoofer re-

quirements, but also for those applications,

e.g., very-low-frequency synthesized effects

and down-tuned bass guitars, that require high

output below 40 Hz. This extended low-fre-

quency performance also plumbs the depths

of the symphony orchestra and pipe organ.

The directional characteristics of the TL88OP

were measured in Electro-Voice’s large

anechoic chamber; the test signal was one-

third-octave filtered pink noise at the fre-

quencies indicated. A full spherical measure-

ment system was used. All directional informa-

tion was measured at 6.10 meters (20 feet).

Figure 2 illustrates the horizontal and verti-

cal polar responses. Figure 3 shows the hori-

zontal and vertical beamwidths. Beamwidth

is the angle at which the horizontal and ver-

tical polar responses have decreased in level

by 6 dB when compared to the axial fre-

quency response.

Figure 4 illustrates the total directivity of the

TL880P The directivity factor R,(Q) is the

ratio of the SPL of the TL880P  at a given

point to the SPL of an ideal omnidirectional

source at that same point. The directivity

index, 

 is calculated by   = 10 log,,, R,.

Frequency Response

Power Handling

The TL88OP’s  axial frequency response was

measured in Electro-Voice’s large anechoic  cham-

ber at a distance of 3.05 meters (10 feet) with a

swept sine-wave input. Figure 1   has been aver-

aged and corrected for 1 watt/l meter into the

transducers.

Electro-Voice 

components and systems are

manufactured to exacting standards, ensur-

ing they will hold up, not only through the

most rigorous of power tests, but also

Содержание TL880P

Страница 1: ...en the screen and theatre wall often makes it difficult to con nect to the back of an enclosure Directivity In addition to motion picture applications the TL880P is highly appropriate as the subwoofer in large multiway systems for contemporary music playback and sound reinforcement The TL88OP has more output below 40 Hz than the devices typically used in these applications in either the normal 25 ...

Страница 2: ... Subpassband Speaker Protection The P1250 power amplifier provides 12 dB per octave infrasonic protection of the EVX 18OA s below the P125O s peak boost frequency of 26 Hz Protection is increased to 24 dB per octave below 15 Hz P1250 Settings The TL880P is shipped with the P1250 rear panel processor settings set for step down mode See Figure 6 The speakers are con nected to the central bridged out...

Страница 3: ...s not impeded A minimum clear ance of 76 mm 3 in should be maintained Architects and Engineers Specifications The loudspeaker system shall be an ampli tied dual low frequency bass reflex design Two 18 inch woofers shall be front mounted in a 414 liter 14 6 cuft enclosure The sys tem shall meet the following criteria The loudspeaker shall be capable of handling a total of 1 200 watts long term aver...

Страница 4: ... are guaran teed against malfunction due to defects in materials or workmanship for a period of three 3 years from the date of origi nal purchase Additional details are in cluded in the Uniform Limited Warranty statement Electro Voice Accessories are guar anteed against malfunction due to de fects in materials or workmanship for a period of one 1 year from the date of original purchase Additional ...

Страница 5: ...P Amp Settings for Step Down Operation as shipped 300 300 200 100 80 60 40 30 20 20 30 50 100 200 500 1000 2000 FREQUENCY Hz FREQUENCY k P1250 Amplifier Settings 5 3 Hz LIMITER TIME coNsTAM Jp4 pHZ Ems D gay 5r PRCCE POLE iILlER FREQMNCY IF2 FAST SLiM BRIDGED NORMAL The settings above require the vent cover to be in place as delivered for proper and safe operation of the system ...

Страница 6: ...ter Frequency 15 Hz as shipped Slope 12 dB as shipped Enclosure Materials and Colors Black texture painted poplar plywood Amplifier Safety Approvals in procedure UL 8 13 CSA C22 2 IEC 65 ENG 0065 EMC Directive for European RFI EMI emissions Dimensions Height 1 21 m 47 5 in Width 762 mm 30 0 in Depth 605 mm 23 8 in Net Weight 89 6 kg 197 5 lb Shipping Weight 97 6 kg 215 3 lb Amplifier see P1250 doc...

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