SK-4429 Frequency response: 100-20K Hz SPL: 90dB		SK-4521 Frequency response: 100-20K Hz SPL: 90dB		FOP2150 S/N: ≥80dB St separation: ≥50dB
FQB4.1 S/N:≥80dB St separation:≥50dB		FQC280 S/N: ≥80dB St separation （+A）: ≥50dB		FQC250 S/N: ≥80dB St separation : ≥50dB
FQBH5.1 S/N:≥80dB St separation:≥50dB		FQA2120 S/N: ≥80dB St separation: ≥50dB		FQC480 S/N: ≥80dB St separation （+A）: ≥50dB
FQF415 S/N: ≥80dB St separation: [＋A]≥50dB		SK-4223 Frequency response: 105-20K Hz SPL: 89dB		FOB2220 S/N:≥80Db St separation: ≥50dB