[QRV09%25202X%2520THD%252BN%2520vs%2520Frequency%2520150%2520Ohms%2520%2528yellow%2529%252015%2520Ohms%2520%2528blue%2529%2520%2528Ref%2520400%2520mV%2520RMS%2529%255B2%255D.png]