The term quadriphonic system is identified in base64 scheme by the sequence cXVhZHJpcGhvbmljIHN5c3RlbQ==, while the MD5 signature is equal to b5b47fe9e75a432725a64a2dba7a833e. The ASCII encoding of quadriphonic system in hexadecimal notation is 71756164726970686f6e69632073797374656d.