Ferrite Magnet Audio Nirvana vs. Fostex and Hemp Acoustics For 8 and 6.5 inch models

Audio

Nirvana

Standard 8

Audio

Nirvana

Super 8

Audio

Nirvana

Super 8

Cast Frame

Fostex

F200A

Fostex

FE206EN

Hemp

Acoustics

FR8C

Audio

Nirvana

Super 6.5

Audio

Nirvana

Super 6.5

Cast Frame

Fostex

FE166EN

Fostex

FE167E

Price $128/pr $158/pr $188/pr $975/pr $204/pr $260/pr $138/pr $168/pr $150/pr $150/pr
Size 8 inch

200mm

8 inch

200mm

8 inch

200mm

8 inch

200mm

8 inch

200mm

8 inch

200mm

6.5 inch

165 mm

6.5 inch

165 mm

6.5 inch

165 mm

6.5 inch

165 mm

Phase Plug no yes yes no no no yes yes no no
Cone Material paper paper paper paper paper hemp/paper paper paper paper paper
Surround Design accordian accordian accordian foam reverse roll accordian accordian accordian reverse roll reverse roll
Surround Material treated cloth treated cloth treated cloth foam treated cloth treated cloth treated cloth treated cloth treated cloth treated cloth
Frame Material stamped steel stamped steel cast

aluminum

cast

aluminum

stamped steel cast

aluminum

stamped steel cast

aluminum

stamped steel stamped steel
Magnet Material ferrite ferrite ferrite alnico ferrite ferrite ferrite ferrite ferrite ferrite
Impedance 8 ohms 8 ohms 8 ohms 8 ohms 8 ohms 8 ohms 8 ohms 8 ohms 8 ohms 8 ohms
SPL (Efficiency) 96 dB 96 dB 96 dB 90 dB 96 dB 95 dB 94 dB 94 dB 94 dB 94 dB
Rated Input (Power Handling) 30 watts 30 watts 30 watts 27 watts 30 watts 45 watts (?) 30 watts 30 watts 22 watts 22 watts
Frequency Response Fo-20k Fo-20k Fo-20k Fo-20k Fo-20k 40-20k (?) Fo-20k Fo-20k Fo-22k (?) Fo-22k (?)
Driver Weight 7.8 lbs

3540 gms

7.8 lbs

3540 gms

8.2 lbs

3690 gms

9.7 lbs

4400 gms

7.0 lbs

3200 gms

3.3 lbs

1500 gms

7.6 lbs

3435 gms

8.0 lbs

3650 gms

3.5 lbs

1600 gms

2.9 lbs

1320 gms

Magnet Weight 3.2 lbs

1455 gms

3.2 lbs

1455 gms

3.2 lbs

1455 gms

2.0 lbs

905 gms

2.3 lbs

1067 gms

1.2 lbs

550 gms

3.2 lbs

1455 gms

3.2 lbs

1455 gms

1.3 lbs

600 gms

0.8 lbs

362 gms

Voicecoil 1.4 inch

35.5 mm

1.4 inch

35.5mm

1.4 inch

35.5mm

? 1.4 inch

35.0 mm

1.0 inch

25.4 mm

1.2 inch

30.5 mm

1.2 inch

30.5 mm

1.0 inch

25 mm

1.0 inch

25 mm

Fs (Free Air Resonance) 39 hz 37 hz 42 hz 30 hz (?) 45 hz 45 hz 46 hz 48 hz 53 hz 52 hz
Re 7.2 ohms 7.2 ohms 7.2 ohms 7.3 ohms 6.8 ohms 6.2 ohms 7.2 ohms 7.2 ohms 7.2 ohms 7.1 ohms
Mms 13.5 g 11.7 g 11.5 g ? 12.2 g 9.0 g 7.66 g 7.9 g 6.8 g 6.68 g
BL 11.0 Tesla/M 9.3 Tesla/M 11.0 Tesla/M ? 10.6 Tesla/M Not given 8.6 Tesla/M 7.8 Tesla/M 7.65Tesla/M 6.82 Tesla/M
Qms 4.86 3.72 3.38 2.63 4.6 2.5 3.03 2.9 3.43 4.63
Qes .20 .23 .18 .36 .19 .50 .22 .33 .27 .33
Qts .19 .21 .18 .32 .19 .40 .20 .29 .25 .31
Vas 72 liter 95 liter 73 liter 99 liter 71 liter 95 liter 36 liter 25 liter 37 liter 36 liter
Eff/no 2.2 % 2.1 % 3.0 % .76 % 2.7 % Not given 1.6 % 1.3 % 1.7 % 1.4 %
Xmax 1.0 mm 1.0 mm 1.0 mm 2.0 mm .8 mm 1.9 mm 1.0 mm 1.0 mm 1.0 mm 0.6 mm

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