Velodyne DF-661 User manual

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Thank you.
You've just made an impo rtant purchase.
The DF·66! Distortion-Free F ull-Range
Loudspeaker Is guaranteed to bring you the
superior performance and qualir)' sound
that you demand. Years of listening pleasu r e-
all brought to you by Velodyne.
The DF-661 is a true breakthrough in audio
[ethnology. By designing drivers from the ground
up to be low in distortion, and incorpo rati ng
s('veral new technologies never befo re seen in
production, Velodyne has reduced harmonic
distortion to an order of magnitude below that
in the best drivers currently a;'ailable .
Velodynebelieves that harmonic distortion is
the basis for most of the probleJJl5 associated with
music reproduction. Using this theory as a design
parameter, the first ULD (Ultra Lo w Distortio n)
subwoofer was create din 1983. Th e success of
the subwoofers has proven that low dis t ortion
does make a difference. Now, with the help of
rn.any new materials and technolOgies, the low
distortion design prindpie has been applied to
the enUre audio spectrum. The result-
a loudspeaker with unprecedented
clarity, detail, and dynamics .
Vefodyne 's Dr~661 is a time less pie ce -
of f ering you years of the highest qu ality sound .
Once you listen . you "''ill never be satisfied
with anything less .

Safety first
CA UT I ON . Tor ed u ce t il eri sk of elw ri c ~hack , do no!
1 !!Im '18 C INe!" lo rb ack ). No Uoer-smv i c€able pa rt s i ns id e
Ae f er wr.'lC i rq to qJalifi ed Seri te pe rs on n el.
TIlIl liJ ht llinQ fl as h \~ it h 31 1 0'1 i '1e a6 s',moo t, wi th in an equi ·
lat era l tr i ang l e, is i nte n ded to alfn me us er tot he ~es 
c nc eof un in su l ated " da l1gelous vo lt iJge" wi th in the p'!l-
duct's en closure th at m ay beof su fficient magn it ud e to
c~H\ s ti t u te ar isk of el ec tricsh ed: to p€ rs tl'l5
T he cl am poin t wit hin an eq ui ~ ate r a l tr ia ng le is i nt e~ded to
al ert ti le use r to the pr ese " ~ of impor t ant ope!~ t i flg J nd
m all l1 ena nc e IS8rY ici ng ) i nstr u ctions in the li ter at u re
"( co mp .m Y ln gt he appli ance.
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1 Read in s \m c tion s. Al l so i ety and ope ra lhg
inst ru cti on s s ho uld be rea d b efo re the appl i·
an ce is ~ era t ed .
2. Retain in str uc tions . The s.a f ety aM o pe rat bg
ins tr uc ti ol1S siuJ ld be f €ta me d fIX fu: ure rsil:r ·
E
nc e
3. H
eed War nilX]S. Alll'.'a :n i lX] S Qn t oo a pp ll ar.ce an d In
tre ( ::<;E!!d ti lX] in st r uc ti on s sh oul d tE adlle r erl tn .
4. Fo ll ow in struc tion s. A ll ope ra ting allli ~s e in s tru ctiom
s/l ou ld be f ol lo w oo .
~.
5. Wa t er and mois t ure. T he a pplianc esl mu ld
oo t tE u se d nea r wate r- for exam pl e, near a
bat h 1lib , wash bo wl, ki tch en sin k, l au nd ry t uo,
inaw et Mseme nt, neol a sw i mming p oo l or
the li ke
6. Ca rts aTld Sl am ts T t. € ~ p p lia nce shoulil tle us ed 001'1
with a Cil r! 01 staTld rK ol1 men d ed by the man u fac tur er .
7. Wall 01 Ce ili ng Mount i ng . Til eappli ance sh oJ ld be
m OJnt oo toa wa ll or ce i lir lJ on ",. as leCD:TYIl€:l ld oo by the
man uf oc tur er.
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8 He al The ilppliance sho~ld be situated
away from he at sources such as radiators.
s t o~ es. or o ther app larces that proooce heal
9. Cl e aning . The appliance should be c leaned
on ly as recoml1e r.dej by the manufactu rer
10 . Object and li quid E nlP,' C af e should be
t a~e n so that oh;ects do not fa !! and liquids
are nO! sp il ed into the enclosure through
qle1ings .
1 1. Oamage R equiting Ser/ice . Th e applia nce should be
se f'li,e d by ~u;;lifioo ser.ice persronal \WJen :
a Objects hove falle nI)" EqUid has been
spil l ed into me ap plia~ce. O!
The apphCilce has I:leen e;qlosed 10 raill: O!
c. Th ea pplianc e doo~ not apDed ' \(J operate nornally
O! exhib i ts a marked change in pariO!maJlCe. O!
d The app l: an ce has tEgn dropped. m the enclosure
d amage d.
12. SeIVlClfI,l. The u ser sho uld not alJel1pt to Sffillce the
appliance be¥ond wha t is desc rib ed in t he operat i ng
instl uc tio ns. Al l other S€!v :d ng shoold be (efe:roo \(J Ilual~
'ied sel'llce pe rsor.ne l.
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ULD Series
UL D· 18 THX ' U LD·18
ULD · 15 · ULD · 12
F·Series
F-IOOO ' F-1200 ' F·I500
VA · Series
VA ·8 1O · VA · 1012
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When the best
gets better.
Afte r listening \0 your Df.66J fulJ.range speakers,
you're probably wonderin g how you have gotten
along without them. Your DF-661 stands alone In
the world of fulJ.range loudspealt.ers - but what
a oou t th e rest of your audio environment?
We already know by your DF-661 purchase thai
you care about the amount of dis:ortion infiltrat-
ing your music. If you also care about dean, pow·
erful bass, and you think you're not getting the
utmost bass performance - consider a Ve/odyne
subwoofer. The UlJ). and F- Series VelodyneslJb.
woofers feature our patented High Gain Servo
IHGS) t echnology whic h produces bass with out·
put and accuracy, "nd like the DF-66I, reduces
hannonic dlstortion to a level that is
practically non-existent
Velodyne produces three unique series of sub-
woofers, similar in technology. but differing In
response and output. When deciding between the
thre e ~ ri es, consi der the size and acoustic char ·
act er of your listening room, the overall sound of
your maIn system, ami your preferred listening
level. We re<:ommend ~!ting yout Velodyne
dealer for a demonstration.
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:It Unpacking
Please unpack the system carefully. Remove all staples used to seallhe
carton as they can scratch the cabinet
IMPORTANT : PLEASE SAVE THE CARTON AND AU PACKAG I NG MATER I·
ALS fOR FUTURf USE . WHEN REPACKING, PROPER HANDLING IS ESSEN-
TIAL 00 NOT USE ANY SHIPPING MATERIALS mAT MAY PERMEATE THE
GRill OF THE LOUDSPEAKER AND/OR DAMAGE THE FRONT OF THE
SPEAKER ASSEMBLY.
Record the sellal number In the spare pr ovided be l ow a nd on both l oca·
IJOOS on the wananty card II)' Murt! reference
FOR YOUR RECORDS :
Serial Nu mber
Date of purchase
Name of store _ _ _ _
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]t Installation
Option
#1:
Co n ve ntional
For standard installation, use the l our sooning bars to lin\: the foHawing sock·
ets on the back 01 your DF.fi61:
RED POSITIVE 1+1 HF
BlACK NEGA WE H HF
...
...
Repeat this !),ocedure lor the othe r speaker.
RED POSITIVE 1+1 BASS
BLACK NEGATlVf 1-) BASS
Now ,li nk th e speake r cab le to the power amplifier :
RED POS I TIV E1+) AMP
BlACK NEGAT IV E 1-1 AMP
RIGHT
...
...
REO POS I TIVE 1+) BASS
BLACK NEGA T IVE H BASS
POWER AMPLIfIER
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heard clearly and pr&isely. as it was genera t ed, wi t hcut th em askirtg of
the additional harmooic distortions
The resulting IIl1provement in clarit y and detai l provides the discerning lis-
tener WIth the most accurate, distortIOn-free productmn of music available
in the world today Finally. you can hear all the nuances of the music
urmasked t1t' the e limi nation of the unintended distortiros.
Other Comparable System
1. 00000 kHz
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]t Proof Positive
Preseflted bela.v you wi ll see t' NO gr aphs comlla r ll"l\l t he OF.f161 to a high ly
r ega rd ed com pe ti vely pr i ced spea~e r In each case, Ire hi ghest peak repre·
se M es t he funda menta l '1KHz s,gnal generated in the tesL The informatioo
to tne lett of the rurKl~mental on ,he graph is noise generated by the test
equipment itself.
Note the size of the add i tional harmonics. Ihal is.the pea<s generated al
2KHz, 3KHz , 4KHz. 5KHz. and 6KHz. Each of these represents ava ria ti on
fr om the or ig inal signal, a distortion , You can ea~ily see the I mprl]V{!ment in
th e DF - 56 1 The DF · 561 t ech nol ogy h as si gn if icant lyr educed the narrnOlllc
dist on ionpr esem in th e spea ker.al lowing tile fu~damental l KHI note to be
OF-661
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]t Installation
Option #2:
Bi-wired
ai'Wlfing requires ~ sets of speaker cables_ Cables can either be the same,
or diHerent cable can 00 used for the BASS and HF crossovers . NO SHORTI NG
BAAS ARE REOOlREO FOR THIS INSTAlLATION OPTION .
REO POSITIVE !+) HF
REO POSITIVE !+) AMP
BLACK NEGATM !-)HF
BlACKNEGATM (-l AMP
...
...
...
...
Repeat this procedure for the other speaker
RIGHT
HF
RED POSITIVE h·) AMP
RED POS I TI VE 1+) BASS
BLACK NEGATIVE (-lAMP
BLACK NEGA lIVE (-l BASS
POWER AMPlifiER
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UfT
BASS

>Installation
Option
#3:
Bi - amplified
Bi-amplificatiOlI requires.!J:ill st ereo powe r amp li fiers (noted below as #1 and
121. NO SHORTING BARS ARE REQUIRED FOR TH ISI NSTALLATION OPTION.
RED POSITIVE It) HF
BLACK NEGATIVE H HF
RED POSITIVE(+1 BASS
BLACK NEGATIVE H BASS
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Repeal this procedure lor the other speaker.
RIGHT
RED POSITIVt (t) AMP #1
BLACKNEllATIVE HAMPll
Rm POSITM It) AMP i2
BlACK NEGA TlVE H AMP n
POWER AMPUFIERS
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rounds them
SHOULD AL OUDSPEA K ER HAVE DISTORTION ?
Distoma" tan have a profourd influence on the percept i on of r ep roduced
sound. It can make the music less complex. and add apl easa nt Oassy over -
lone . Howe\'er. this ~an be achieved during the recording and mixi ng
process, and isn't that where 11 belongs? A loudspea k er has no bus in ess
manipulating the music . Its sale furn:tion is to reproduce, and it sho uld
reprtxluce as faithfully as possible .
DOES DISTORTION MAmR ?
For all practical purposes, the audio 'MIrld has dismissed distonion as ha'l-
iog a negatIVe impact on musIc reproduclJon. SeverallalJonalizations have
emerged , If the loudspeaker is distorting, the distortion should be audible
as such. Although one can easily hear distortion products from a single
tone , music supposedly has a masking effect that covers up these over-
tones. If 10\." distortIOn were importam, then I'Aly don't loudspeakers with
krNer distortion sound bener than ones with more distortion?
OistOltion is aooib!e as a fIOIse source that is synchronous with the music.
You ootice II most wh ae lislenrng to the background music rather than the
princrple rnstnlnenl The experiments done on "masking " up to this point
have been valid ooIy tor small groups of steady·state tones, not the c¥ram-
ics of music. The human ear is capable of discerning very complex musical
events; theretore, the " masking" effect need not be thaI !)'Onounced to be
problematit. Usually, attempts at lowering dis\onioo have focused on the
2nd harmonic, which, although less critica l, IS the easiest to correct in a
loudspeaker. A mOle distinguishab le distortion is prod u ced when a spea ker
IS played at a slightly higher l!!Vel. This resu l ts in an i rc rease i ll th e3 rd har-
monic distortion with a decidedly negatNe effect on the rep roduce ds ound ,
disutor.tion
\di-'stor-shan \n
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~ Maintenance
We r eco m mend u si ngacl ean damp cloth f or cl eani ng the cabinet Never
u se de te r ge nts or ab r as i ves on your OF - 561
]t Trouble-shooting
& Service
Be f ore co n tacti ng your dea ler tor service. pl ease no te the conditiorlS below
th ai m ay cause seemi nglyunusual beh<lv ior in you r system.
m
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m
No output
Make su re t hat yo ur s ys t em co mpo nents are turned
on, a nd tha t the s peaker wires and al l interconnect -
ing ca bles are co nnect ed.
Popping and / or ticking noise s
Ti gh tenall termi na ls 10 prevent v ibr ation .
Poor Imaging .
Check pl acement. For best result s, ynut pair of of-
56 1 speak ers shou ld be about the sa me distanGe
f ro mt he wa ll s wi th th e sa me amo unt of to e·in.
Movi ng the speakers away t ro mt he surrounding
wal ls m ay im prove i mag i ng. Check pola r ity .
Weak output, loss of highs
Cheek that short i rYiJ ba rsarei nstalled .
Lack of Ba ss
Check to make sure the po l arity of the speake r wir es
is calfee !.
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]t DF-661
Specifications
DIMENSIONS :
Height 18
71
8.
Width: B1 12 "
Depth: 10 1 /2"
Drive units: low reactance woofer 6' • low re actance midrange S' •
tweeter I" aluminum dome
WEIGHT (each~ 4Olbs .
DISTORTION :
<O .l% THOallwatl
INTERNAL V OLUME :
Woofer / 700 cubit i nches . midrange!2fi(J cubic inches
IMPEDENCE :6 ohms
SENSITIVITY : 1 wa n at 1 meter produces BBdB
POWER RATING : 75 wailS mi nimum , 300 watts max imum per channel
CROSS O VER FREQ U ENCY :lway. 750Hz!5000Hz.
18/12/12/24 dB/Octave
SYSTEM FREOUENCY RESPONSE :
Aat"ldB from 60Hz - 20K Hz
WA RRANTY: 2 years
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