Table:
0
A
B
C
D
E
F
G
H
I
1
Headphone Model
Headphone Class
Sensitivity (dB)
Impedance (Ohms)
Driver-matched dB
Construction
Earpads
Termination
Succeeded by
2
SR40
Unknown
100
32
Unknown
Plastic
Foam
1/8" (3.5 mm) plug with 1/4" adaptor
iGrado
3
SR325
Prestige
98
32
0.05
Aluminum Alloy
Bowls
1/4" (6.5 mm) plug
SR325i
4
HP1000
Joseph Grado Signature
Unknown
40
Unknown
Aluminum Alloy
Flats
1/4" (6.5 mm) plug
No Successor
5
SR100
Prestige
Unknown
32
Unknown
Plastic
Flats
1/4" (6.5 mm) plug
SR125
6
SR200
Prestige
Unknown
32
Unknown
Plastic
Flats
1/4" (6.5 mm) plug
SR225

Questions and formulas:
Question: Name the number of headphone class for sr100
Formula: ROWS(UNIQUE(FILTER(B1, A1="SR100")))
Formula2: ROWS(UNIQUE(FILTER(B2:B6, A2:A6="SR100")))
Level: medium
Question: Name what succeeded by for foam
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,G1="Foam"),9))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I6,G2:G6="Foam"),9))
Level: medium
Question: Name the headphone model for succeeded by sr125
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,I1="SR125"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I6,I2:I6="SR125"),1))
Level: medium
Question: Name the driver matched db for joseph grado signature
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:I1,B1="Joseph Grado Signature"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:I6,B2:B6="Joseph Grado Signature"),5))
Level: medium