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VOLUME 24, ISSUE 9
JULY 2011
®
IN THIS ISSUE
INDUSTRY NEWS
AND DEVELOPMENTS
21
1
ACOUSTIC PATENTS
By James Croft
INDUSTRY WATCH
24
8
SPOTLIGHT
By Vance Dickason
Phase Response and
Receive Delay
By Charlie Hughes
30
Products & Services Index
dex
eMagine this speaker
design, p. 12.
g,p
12
SPOTLIGHT
eMagine Factory Industrial/
Mechanical Design Consultants
By Vance Dickason
14
TEST BENCH
B&C Pro Sound Compression
Drivers and Horns
By Vance Dickason
20
SPOTLIGHT
ALMA at Prolight+Sound 2011
By Mike Klasco
Coming soon from KEF:
the Blade speakers, p. 24.
Industry News and Developments
By Vance Dickason
u
Mounting Thread:
11.7mm 60UNS2
u
4048 ACOtron 1/2
p
Phantom Preamp
u
Frequency response
at 22pF: 5Hz to 200kHz
(-2dB)
u
Loss at 22pF: 1.5dB
typical
u
Noise floor at 22pF:
<1.5
M
V typical about
16dBA with 7052H
u
Output performance
48 to 24V Phantom:
1kHz - 14Vp-p (5V
RMS) into a 5000pF load
<1%THD
u
Power supply sensitivity: <0.1dB
u
Mike mounting thread: 11.7mm 60UNS2
u
Power/output connector: XLR 3 pin -male
For more information on the 7025PH and 4048 pre-
amp, visit
www.acopacific.com.
New Measurement Microphone from ACO Pacific
ACO Pacific has recently released the 7052PH Type
1.5 phantom-powered measurement microphone sys-
tem (
Photo 1
). Designed to work with from 48 to 18V
DC Phantom Power, the 7052PH’s rugged titanium
diaphragm provides excellent long-term stability and
temperature performance, according to the company.
The companion 4048 ACOtron preamp offers both low
noise and a wide dynamic range. A WS1 3
p
windscreen
is included.
Specifications for the 7052PH and 4048 ACOtron pre-
amp are as follows:
u
7052PH 1/2
p
Electret Free-Field Microphone
u
Type 1.5—a superior Type 2
u
Frequency response: <3Hz to >20kHz typical (capsule)
u
Sensitivity: 22mV/Pa (-33dBV/Pa) typical
u
Dynamic range (capsule) 1% THD: <20dBA-
150dBSPL (capsule)
u
Diaphragm material: titanium
u
TempCo: 0.01dB/C
PHOTO 1: ACO Pacific 7052Ph.
PHOTO 2: Eminence EPS-15C back.
PHOTO 3: Eminence EPS-15C front.
FIGURE 1: Eminence EPS-15C response graph.
New Pedal Steel Guitar Speaker from Eminence
Eminence Speaker LLC has announced the addition of an
ultra-lightweight 15
p
guitar speaker designed for the steel
guitar player: the
EPS-15C (
Photos 2 and 3
)
. Now avail-
able in the Patriot Series of guitar speakers, the
EPS-15C
is
a 4
7
cast-aluminum frame guitar driver featuring a light-
weight neodymium magnet. Weighing in at less than 8 lbs.,
the
EPS-15C
(
Fig. 1
) delivers the highly sought-after classic
pedal steel tones at a fraction of the weight of most suitable
drivers on the market, according to the company. The addi-
tion of an aluminum dust cap lends “chimey,” extended
highs that have come to define the classic pedal steel sound.
Specifications for this new driver are as follows:
Fs
Qms 14.41
Qes 0.32
Qts 0.31
Vas 188.4 ltr
Mms 79.9 grams
Sd 864.6cm
2
Bl 15.3Tm
Xmax 3.3mm
For more on this new driver from Eminence, and to take
a look at Eminence’s new website, go to
www.eminence.com.
NTi Audio Launches FLEXUS Audio Analyzer
NTi Audio AG has recently unveiled its new FLEXUS
Audio Analyzer (
Photos 4 and 5
), which features a modu-
lar concept with flexible configurations. High-performance
42Hz
Re
3.57
7
MENLO
SCIENTIFIC
Liaison Between Materials,
Suppliers, & Audio Manufacturers
Engineering Consulting
for the Audio Community
Technical Support for Headset,
Mic, Speaker & Manufacturers
Product Development
Test & Measurement
Instrumentation
"""
USA
tel
Sourcing Guidance
$ !#%
4
VOICE COIL
PHOTO 4: NTI FX100.
PHOTO 5: NTI FX100 setup.
specifications paired with the latest technologies such as
fast sweeps make the FX100 Analyzer equally attractive for
R&D as well as high-speed production testing applications,
according to the company.
The FLEXUS Audio Analyzer is designed around a
modular hardware concept, which allows customization for
two or four parallel channel operation.
The impedance module supports speak-
er measurements for obtaining imped-
ance plots and Thiele/Small parameters.
Individual input switcher and output
switcher modules extend the audio ana-
lyzer to 14 input channels or 14 output
channels connected simultaneously. The
FX-Control suite can operate several
FX100 in parallel, thus offering cascaded system measure-
ments.
For measurement speed optimization, the FLEXUS
Audio Analyzer acquires all measurement functions in
parallel. Measurement technologies incorporated into the
FLEXUS analyzer include fast glide sweeps (Farina sweep);
detailed stepped sweeps and a continu-
ous meter mode further support fast and
accurate measurements.
The wide level range from 1
M
V -
200Vp paired with a typical THD+N
of -104dB enables the FX100 to cope
with comprehensive audio and acoustic
analysis for research and design labs. The
FX100 offers a wide frequency range
FIGURE 4: NTI Audio FX100 analyzer rub
and buzz test plot.
FIGURE 2: NTI Audio FX100 analyzer frequency response plot.
FIGURE 3: NTI Audio FX100 analyzer distortion plot.
Publisher
- Edward T. Dell, Jr.
Editor
- Vance Dickason
(
E-mail
vdc@northwest.com
)
Contributing Editor
- Richard Honeycutt
Vice President
Karen Hebert
Dennis Brisson.............Assistant Publisher
Richard Surrette ...........Editorial Assistant
Laurel Humphrey.........Marketing Director
Jason Hanaford ............Graphics Director
Jay Sennott...................Graphics Assistant
Sharon LeClair .............Customer Service
Submissions
Send all press releases and information to
Voice Coil
Editorial Dept., PO Box 876,
Peterborough, NH 03458, or FAX us
material at (603) 924-9467, e-mail
editorial@audioXpress.com
.
A
DVERTISING
Please direct display advertising inquiries to:
Peter Wostrel, Account Manager, Strategic
Media Marketing, USA, 978-281-7708,
FAX 603-924-9467, Toll-free 800-454-
3741, e-mail
peter@smmarketing.us
.
Please direct classified and artwork inquiries
to: Jamie Costa, Advertising Coordinator,
Voice
Coil
, PO Box 876, Peterborough, NH 03458,
USA, 603-924-7292, FAX 603-924-6230,
e-mail
advertising@audioXpress.com
.
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Voice Coil
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Voice Coil
, (
ISSN 1521-091X
),
the Periodical of the Loudspeaker
Industry, is published on the 25th
of each month by Audio Amateur
Incorporated, PO Box 876,
Peterborough, NH 03458-0876 USA,
(603) 924-9464,
FAX (603) 924-9467.
Copyright 2011 by Audio Amateur
Incorporated. All rights reserved. Quotation
from
Voice Coil
is forbidden without written
permission of the publisher.
5
JULY 2011
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Voice Coil 2011 02.pdf
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Voice Coil 2011 03.pdf
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Voice Coil 2011 04.pdf
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Voice Coil 2011 05.pdf
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