Editing Cassette tape (section)

=== Head gap ===
The head-gap width{{clarify|reason=is this a typical value? A standard value? Something originally spec'd by Philips? Just stating that it "is" is problematic, esp when we go on to say that sometimes it's markedly narrower|date=March 2018}} is 2&nbsp;μm{{according to whom|date=March 2018}} which gives a theoretical maximum frequency{{citation needed|date=March 2018}} of about 12&nbsp;kHz (at the standard speed of 1 7/8 ips or 4.76&nbsp;cm/s). A narrower gap would give a higher frequency limit but also weaker magnetization.<ref name=happ2/>