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Incidentally, the Iron Law explains the difference between the KLH-17 and the Smaller Advent alluded to earlier. The Smaller Advent has a lower woofer resonance (43 Hz vs 60 Hz) and a smaller cabinet than the KLH-17; it pays for its deep-bass performance and compact size with a loss of efficiency.

I have compiled the following tables using all of the above methods for obtaining values. Since the data derived from High Fidelity are the most precise (probably to within ± 1 db), those values are collected

in the left-hand column.

Data obtained from the other sources are

listed in the right-hand column; they should be regarded as approximate

and preliminary, and may not be reliable to better than ± 2 db. All values are rounded-off to the nearest whole decibel.

(High Fidelity)

(Other sources)

SPL at 1 watt

Approx. power for 100 db .

Name

Approx . SPL t a power for 1 watt 100 db

Name

87

20 w

ESS Transtatic I

88

16 w

Fisher XP65B

82

60 w

Fisher WS-80

87

20 w

Jensen 2

83

50 w

Fisher ST-550

86

25 w

Jensen 3

86

25 w

Frazier Mk VI

86

25 w

Jensen 4

82

60 w

IMF Monitor Mk II

90

10 w

JVC 5322

82

60 w

Audioanalyst A100

84

40 w

B & 0 5700

82

60 w

Dyna A25

85

30w

DynaA35

82

60 w

EPI 100

89

12 w

Marantz Imperial?

87

84

40 w

Onkyo 20

85

90

10 w

Pioneer R-700

83

50w 20w 16 w 50w 50w 16 w 12 w 20 w 30 w 50 w 25 w 25 w 12 w 30 w

KLH 5 KLH 6 KLH 17 KLH 32 KLH 38 Laf. Criterion 4x Laf. Criterion 5xa Laf. Criterion 6 Marantz Imperial 5G Microacoustic 10 R. Shack Optimus 1 R. Shack Optimus 5 Pioneer R-300 Rectilinear Mini-III

20 w

Scott S-15

83 db

50 watts AR LST

82

60 w

AR 2ax

83

50 w

AR 6

84

40 w

AR 7

81

80 w

Smaller Advent

86

25 w

ADC 303B

84

40 w

ADC 450

83

50w

AR 5

83

50 w

Large Advent

83

50 w

ADC 303A

85

30 w

ADC 303AX

86

25 w

Altec 887A

88

16 w

Altec 892A

87

20 w

Altec 893B

83

50 w

Infinity 1001

83

85

30 w

Infinity T-L Monitor

87

87

20 w

JBL 100

88

83

db

50 watts AR 3a

86

2.5 w

Dyna A50

85

30 w

Dyna A 10

82

60 w

EPI 50

83

50 w

EPI 150

88

16 w

Fairfax FX300

85

30 w

KLH 33

83

90

10 w

Laf. Criterion 200A

83

88

16 w

Leak Mk III

88

92

6w

LDL 749

89

89

12 w

Empire 7500M

86

25 w

ESS Heil AMT-1

85

30 w

Tannoy Orbitus

83

50 w

Wharfedale W60E

84

40 w

Bose 501

86 86

89 85 87

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