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* K=1000. PR=pair. PTC=partial trades considered. AP=as pictured. ?=FAQ.
MissionAllegroSound has been dedicated to the
accurate recording and reproduction of
acoustic music for well over ¼ Century.
For those who value ears-on experience,
AllegroSound is "hear" to assist you.
for AllegroBio 
Featuring* AllegroQC™ with 37+ yrs experience.
* Safe-packing. Trust your purchase to
one who knows & cares to pack it right.
World-Wide Shipping
ConditionSome be 10~60 yrs old with imperfections,
non-functioning lamps, old capacitors, etc;
NO "mint", "minty", "perfect", "excellent".
AllegroGrading™ : 5 = New-In-Box,
4 = VeryGood, 3 = Good, 2 = Fair, 1 = Poor.
All pre-owned/used unless otherwise noted.
See Pics, MainsVoltage, Terms below.
PicsPics are shown for display purposes
& may not represent exact condition;
text trumps pics - read description
and email if you need clarification.
Mains Voltage & What To Do About It
220~240 Vac
PricesFrom computer, place your pointing-arrow
ON the rotating $-sign below each listing;
price will pop up within 2 or 3 seconds;
if not, Click "HELP" in the floating Menu >>>
* all prices U.S. currency f.o.b. Los Angeles, California USA.
* prices without deposit subject to change without notice.
* AllegroLayAway™ with 20% non-refundable deposit.
* AllegroTradeUP™ with your approved TRADE-IN.
Trade-insTrade-in & purchases are not final until received,
inspected, tested and approved by AllegroSound.
Items failing to meet described condition will be
returned at customer's expense plus $50 min fee
for inspection/testing; additional fees may apply.
Terms & ConditionsEquipment is carefully inspected, cleaned,
variac'd, tested for dc-offset & auditioned
in ref system before it leaves our facility.
Quality work with TLC takes quality time;
I work at my pace & have orders ahead
of yours; item will ship when testing is
completed and packed for safe transit.
Suitability sole responsibility of Buyer.
Not responsible for errors/semantics/etc.
All items subject to prior sale or no sale.
Prices subject to change without notice.
All equipment as-is without warranty.
All sales f.o.b. Los Angeles California;
all matters and costs beyond this point,
incl, but not limited to, packing, freight,
duty, taxes, fees, are sole responsibility
of Buyer. All sales final. No refunds.
Add 8.75% SalesTax in California.
CROSSOVERS: ActiveMulti-amping with electronic crossover be the path to audio virvana.
since 1972.
fabled Accuphase F-5 electronic crossover,
2/3-way, 12-18 db, plug-in Fc, all discrete.
Accuphase F-5 crossover since 1972.
Accuphase CB cards for
F5 - F15 - F15L xovers.
Buy-Sell-Trade cards.
Accuphase CB since 1972.
Accuphase FB cards
for F-20 & F-25 xovers.
Buy-Sell-Trade cards.
Accuphase FB Bi-amp with Bryston precision, flexibility, transparency...
fabled Bryston 10B-PRO Balanced Crossover,
Fc 80-90-100-175-200-250-300-400-500-2k-3.5k-4.5k Hz,
6-12-18 db/oct slopes, discrete, late ver, fact warranty.
"I found the Bryston 10B clear, transparent & neutral -
as good as I've ever heard from an outboard crossover.
It is extraordinarily versatile in managing crossover slopes
& frequencies. I recommend it for use in high-end systems
to which a subwoofer is being added." −LG, Stereophile
Bryston 10B-PRO Special-Order Matched-Pair 
fabled Dahlquist DQ-LP1 electronic xover,
35~400Hz sweep, 18db active Low-pass,
6db passive High-pass, solid-walnut sides.
Dahlquist DQ-LP1 crossover 
since 1980.
Krell Reference Crossover KRX-1,
3-way or 2-way, plug-in Fc cards,
6 calibrated attenuators, discrete,
rack-mt, outboard ps, c.1985.
Krell KRX-1 crossover 
Luxman FL-202 Balanced Electronic Crossover,
80-150-290-380-500-660-800-1k-1280-1700-2kHz,
12-18 db, locking Fc, Polarity switch and Level
for HP & LP, XLR-Balanced in/out, all discrete,
outperforms usual suspects, 5-7-17",15 lbs.
Luxman FL-202 electronic crossover 
Nikko CO-23 elect crossover,
discrete, 2-way, 12-18 db/oct,
125-160-200-250-320-400-500-
630-800-1k-1250-1.6k-2k-2.5k-
3.2k-4k-5k-6.3k-8k-10k-12.5k,
black rack-mount faceplate.
Nikko CO-23 crossover
fabled Pioneer SF-700 crossover
c.1973, 3/2-way, 6-12-18 db/oct,
125-250-500-700-1k-2k-4k-6k-8k.
Pioneer SF-700 crossover 
fabled Pioneer SF-850 crossover
c.1976, 3/2-way, 6-12-18 db/oct,
125-250-500-700-1k-2k-4k-6k-8k.
Pioneer SF-850 crossover
fabled Pioneer Series20 D-23
4-way electronic xover c.1977,
switch-select Fc and Slopes
for each pair of 8 outputs, 20#.
(or, you could pay 5x more for
three Pass Labs XVR1 2-ways)
Pioneer D-23 crossover front-panel real-time-tuning!
fabled John Curl Symmetry ACS-1
"transient-perfect" variable xover
c.1981, Fc 45~4500Hz, rack-mt.
Symmetry ACS-1 crossover any Fc! Stereophile A-rated. a Nelson Pass design.
fabled Nelson Pass Threshold PCXe
electronic crossover, 18 db/oct,
2-way/stereo or 3-way/mono/pr,
Fc changeable in seconds via
readily-available resistor-paks
that drop into way-cool special
Zero-Insertion-Force sockets,
shipped with Fc of your choice,
gold-plated pcb, all discrete,
upgraded with later bigger
& better "e" power supply,
four calibrated attenuators,
17" or 19"rm, AllegroMods™.
* 2 available for TRI-amping.
"the most transparent & least-
conspicuous active crossover
I've heard."−DO/Stereophile.
(or, you could pay 3x more
for Nelson's new version)
Threshold PCX crossover 
since 1957. Speaker designer's dream-machine!
fabled UREI 525 electronic crossover,
2/3-way stereo, 4/5-way mono,18 db,
dial-in any frequency within one Hz
via the built-in frequency-counter,
speaker designer's dream-machine!
UREI 525 electronic crossover with Frequency & Time correction
fabled White Instruments DSP-5024 c.1997,
Programable Crossover-Equalization-Delay,
Frequency and Time Loudspeaker-Correction,
XLR-Balanced ANALOG in/out, 1U rack-mount,
front-panel controls w/Alpha-Numeric Display.
White Instruments DSP-5024 crossover 
AllegroSound
− Established 1973 −
"love what you listen with"
Los Angeles, California USA
Rick@AllegroSound.com
CONTACT AllegroSound 
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