The best replacement for a88 is a85 amd.

The best alternatives to a88 are rated as following:
★★★★★  a85 amd
★★★★★  a85
★★★★★  a55
★★★★★  a7s
★★★★  a66
★★★★  a76
★★★★  a74
★★★  a110
★★★  a92
★★  a26b
★★  a89
★  a91
★  a110q
  p168
  a115
  a111
  i32

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Speaking about a88, one probably shouldn't forget about jbl headphones.

Other search terms related to a88 and their ratings are:
★★★★★ jbl headphones
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a85 amd
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