. .Accessories : Preamps
The standard lightweight LP preamp has tone control, volume control, standby switch and a battery check indicator. The housing consists of special shielded Celstran S Polyamid.
Optional are: The compact aluminum housed L preamp. It does not have any knobs or switches, which can be an advantage for the engineer at the mixing desk. The Pro preamp: it has an extra shielded heavy-duty, stainless steel housing to prevent radiation from heavy light equipment on stage into the electronics.
All preamps can operate with phantom power or a 9V battery. Due to low current electronic circuits the duration of battery life is 1-2 years. They all have a standard balanced XLR output.
 
 
LP metal PRO PREAMP L type (w/o knobs) DM Double mic preamp  
optimum shield again heavy radiation
Stainless steel metal housing		 without knobs: advantage for the engineer
Aluminium housing		 2 inputs + balance control to balance
the 2 signals. Optional: Metal housing		  
Both signals of a piezo element (PU-4 or the one you're using already) can be mixed with the BS-2 type pre-amp: it has a piezo input and a mic input with adjustable volume for both piezo and mic, a balance control between the piezo and mic, tone controls (anti-feedback), stand by switch, battery check, and a line-level output  
HL preamp BS-2 Blender, see    
with 6.3 mm line level input, w/o knobs
Aluminium housing
 combining piezo with mic. Aluminium housing