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Industry Standard Auto Transformer
AT Series UL listed high-quality auto transformer series provides the advantages of excellent frequency response,
low insertion loss and reliable performance for volume control application in 25V and 70.7V systems. Attenuation is
accomplished in ten steps plus positive off position. (No stop between maximum and off position to prevent switch
damage). Contacts are silver plated for noise-free operation. Includes stainless steel plate, stamped and filled dial
scale with skirted black knob.
Model UL Power
Rating
Attenuation
Per Step
Total
Attenuation
Insertion
Loss
Plate
Size
Plate
Type
Plate
Color
AT10
813 & 2043 10 watts 3 dB 27 dB .4 dB 1 gang
Stainless NA
AT35
813 & 2043 35 watts 3 dB 27 dB .4 dB 1 gang
Stainless NA
AT100
813 & 2043 100 watts 3 dB 27 dB .4 dB 1 gang
Stainless NA
AT Decora Series Include White and Ivory Decora Style plastic plates, with matching skirted knobs.
Model UL Power
Rating
Attenuation
Per Step
Total
Attenuation
Insertion
Loss
Plate
Size
Plate
Type
Plate
Color
AT10D
813 & 2043 10 watts 3 dB 33 dB .4 dB 1 gang Plastic Decora
White/Ivory
AT35D
813 & 2043 35 watts 3 dB 27 dB .6 dB 1 gang Plastic Decora
White/Ivory
AT100D
813 & 2043 100 watts 3 dB 27 dB .6 dB 1 gang Plastic Decora
White/Ivory
Auto Transformer with Precision Level Control
E408-100 Specially designed for attenuation in masking and sound reinforcement systems where fine tuning of level
control is required. The E408-100 employs a ten-position, non-shorting rotary switch without stop. Attenuation rate is
1.5 dB per step. (All other specifications are the same as the AT Series including the UL listing).
Model UL Power
Rating
Attenuation
Per Step
Total
Attenuation
Insertion
Loss
Plate
Size
Plate
Type
Plate
Color
E408-100 813 & 2043 100 watts 1.5 dB 15 dB .6 dB 1 gang Stainless NA
Priority Paging Option
PA Series Priority paging feature bypasses the effect of the attenuator to provide program level selection of
individual emergency and paging signals at the amplifier. This option is available on all AT Series attenuators. The
SPDT relay is operated with 24VDC at 10 mA. Includes protective relay cover to ensure lasting trouble-free perfor-
mance. (All other specifications except for dimensions are the same as AT Models.)
Rack Mount Option
RM Series For attenuation convenience of rack-mounted equipment in cabinets and consoles, the AT Series and
E408 Series attenuators are available without mounting plate for rack panel installation. Attractive matte black polycar-
bonate dial scale overlay with adhesive backing replaces the mounting plate, skirted black knob included. Overlay size
is 2" square (51 mm). (To order, simply add RM after the selected attenuator model number. Example: AT10-RM or
AT10-PARM.) (Dial scale overlays to retrofit existing installations are available, see hardware section Model HX23.)
For easy rack mounting of RM Series attenuators, see model ATPLATE-052, Section 4, page 54.
Model Plate Height Depth Attenuator Height Plate Width Attenuator Width
AT10
4
1
⁄2" (114 mm) 2
1
⁄8" (54 mm) 2
3
⁄4" (70 mm) 2
3
⁄4" (70 mm) 1
3
⁄4" (44 mm)
AT10-PA
4
1
⁄2" (114 mm) 2
1
⁄8" (54 mm) 2
3
⁄4" (70 mm) 2
3
⁄4" (70 mm) 1
3
⁄4" (44 mm)
AT35
4
1
⁄2" (114 mm) 2
1
⁄8" (54 mm) 2
3
⁄4" (70 mm) 2
3
⁄4" (70 mm) 1
3
⁄4" (44 mm)
AT35-PA
4
1
⁄2" (114 mm) 2
1
⁄8" (54 mm) 2
3
⁄4" (70 mm) 2
3
⁄4" (70 mm) 1
3
⁄4" (44 mm)
AT100
4
1
⁄2" (114 mm) 2
1
⁄8" (54 mm) 2
3
⁄4" (70 mm) 2
3
⁄4" (70 mm) 1
3
⁄4" (44 mm)
AT100-PA
4
1
⁄2" (114 mm) 2
1
⁄8" (54 mm) 2
3
⁄4" (70 mm) 2
3
⁄4" (70 mm) 1
3
⁄4" (44 mm)
E408-100
4
1
⁄2" (114 mm) 2
5
⁄8" (67 mm) 2
1
⁄16" (52 mm) 2
3
⁄4" (70 mm) 2
5
⁄16" (59 mm)
Industry Standard Commercial Attenuators
AT10
shown in
standard backbox
RM Series
AT10D (decora)
AT10/35/100
Series
E408100
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