20 Hz 50 100 200 500 1K 2K 5K 10K 20K 30KdBSPL50556065707580859095100105110Graph 1a. Frequency response. Trace below 1kHz is the averaged result of nine individual
frequency sweeps measured at three metres, with the central grid point on-axis with the
tweeter using pink noise test stimulus with capture unsmoothed. This has been manually
spliced (at 2.7kHz) to the gated high-frequency response, an expanded view of which is
shown in Graph 2. [Legend Acoustics Kurre 8 Loudspeaker]Newport Test Labs20 Hz 50 100 200 500 1K 2K 5K 10K 20K 30KOhm5678910203040 Deg-180-150-120-90-60-300306090120150180Graph 2. Impedance modulus (black trace) plus phase ). Loudspeaker]Newport Test LabsLAB REPORT Legend Acoustics Kurre 8 Loudspeakers
CONTINUED FROM PAGE 93
LABORATORY TEST RESULTS
Graph 1 shows the measured in-room response of the Legend Acous-
tics Kurre 8, measured at three metres using pink noise (the trace up to
2.7kHz) after which the high-frequency response was measured at one
metre out to 40kHz via gated sinus. You can see it’s exceptionally fl at
so that overall, Newport Test Labs measured it as 44Hz to 38kHz ±3dB,
which is excellent, as well as being quite a bit better than Legend Au-
dio’s specifi cation. The impedance of the Kurre 8 (Graph 2) shows the
typical single resonant peak of a sealed enclosure,
which for this design is centred at 48Hz. The low-
est the impedance falls is to 6Ω at around 130Hz,
which it does only briefl y, so the impedance could
be regarded as being ‘nominally’ 8Ω (minimum 6Ω)
rather than Legend Audio’s 8Ω specifi cation. The
high impedance above 2kHz is apparently due to
the presence of a 22Ω pad on the tweeter to reduce
its effi ciency. Potentially this could interact with
the output stage of some older or poorly designed
Class-D amplifi ers, affecting their high-frequency
response, but should not present any issues with
standard Class A/B amps or well-designed Class-D
amps. The phase angle is very kindly, swinging only
±30 degrees. Newport Test Labs measured the sensitiv-
ity of the Kurre 8 using its standard, very stringent technique, at just
80dBSPL at one metre, for a 2.83Veq input. This means the Kurre 8 is a
very ineffi cient design and will require higher-than-usual levels of am-
plifi er power to deliver average volume levels in your listening room.
Overall, the Legend Kurre 8 is a very well-designed loudspeaker
that delivers a very flat response over an extended bandwidth...the
only caveat being that its very low efficiency will require careful atten-
tion to the choice of the driving amplifier. Steve Holding5HIHUHQFH %
.7 [ : .7 :3DFNDJH GHDO VSHFLDO QG LWHP XS WR I
7UDGH LQ :HOFRPH
ZLWK 00 3KRQR,QSXW ,PSHGDQFH !N RKP 5&$'LUHFW ,Q
RKP 00 3KRQR ,Q
2XWSXW ,PSHGDQFH RKP
2XWSXW 3RZHU : [ 7ULRGH&ODVV$3XVK3XOO
'DPSLQJ )DFWRU !
)UHTXHQF\ 5HVSRQVH +]aN+]G%
7+' +]aN+] 5HI 2XWSXW
,QSXW 6HQVLWLYLW\ !P9 aP9 00 3KRQR ,Q
61 5DWLR !G% +XP 1RLVH P9
9DFXXP 7XEHV % [ 13[ $; [
'LPHQVLRQ [ [ PP '[:[+
:HLJKW NJ 1: NJ *: 2XWSXW 3RZHU :&K
2XWSXW ,PSHGDQFH DQG 2KP
,QSXW ,PSHGDQFH 5&$!. 2KP
%DO. 2KP
,QSXW 0RGH 5&$RU %DODQFHG
)UHTXHQF\ 5HVSRQVH +].+] G%
7+' +].+] 5HI 2XWSXW
61 !G% +XP 1RLVH P9
:HLJKW&+ NJ 1: NJ *:
9DFXXP 7XEHV&+ %[ 1 3 6/ [
$; (&& [ $8 (&& [3RZHU 2QH %
5XJJHG VWDLQOHVV VWHHO FKDVVLV
+LJK TXDOLW\ (, WUDQVIRUPHU DQG FRPSRQHQWV
,QQRYDWLYH WXEH FLUFXLWU\ ZLWK FKRNH FRLO
% WXEH FDQ EH XVHG
&DQ EH ILQH WXQHG ZLWK GLIIHUHQW UHJXODWRU WXEHV
'XDO RXWSXWV FDWKRGH IROORZHU DQG DQRGH GLUHFW
)XOO UHPRWH FRQWURO
6ZLWFKLQJ EHWZHHQ KLJK DQG ORZ QHJDWLYH IHHGEDFN5HIHUHQFH 6 3UH$PS
3UHPLXP 9DOYH +L)L3UHPLXP 9DOYH +L)L
5$5RRNV5RDG1XQDZDGLQJ9,&7HO
ZZZDXGLRVSDFHFRPDXVDOHV#DXGLRVSDFHFRPDX
$XGLRVSDFH$XVWUDOLD3/
+LJK6WUHHW3UHVWRQ
9,&7HO 6XPPHUKLOO5LVH%XQGRRUD
9,&7HO 8 6$XGLR9LVXDO .&$XGLR 0F/HDQV
9LFWRULF6W(DVW*RVIRUG
16:7HO :HVWHUQ$XVWUDOLD
VDOHV#VLPSO\KLILFRPDX6LPSO\+L)L
)LHOG6W$GHODLGH
7HO $9&HQWUH