Amplifying your harp
  Generally.....any harp should be heard clearly without
  amplification in a large room. If this is not so, you would
  be wise to look elsewhere for a "Real" harp.
  There are times when even a "Real" harp
  needs to be amplified.....such as performing
  in a large hall (
although if the hall "acoustics" are
  good, it may not be nessesary)
 
or playing  to an audience in the great
  outdoors......
  or just to be heard above the multiple
  sounds of a market or fair whilst busking....
  A  ceramic pickup (adheres to any harp using double backed tape,
  or Bostik's "Blu-tack"
)  such as a "Matrix" guitar tuner pickup
  or similar (
check your local music shop) and a Mini-Amp is often
  enough for many venues such as busking or even playing
  in a large hall.....We recommend the Marshall MS-2>>>
  as a first amp, as it is inexpensive and totally portable
  (1x9volt battery) and clips to your belt, and even if you
  later need a larger amplifier you can still use the MS-2
  as a pre-amp.
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  Tip: After attaching your pick-up to
   your harp and plugging in to the amp,
   turn the "ON" switch to "OD"
  and the "TONE" switch  to "O"
  and "Volume to "1".....then bring
  the Volume up to your required level.