Questions? Call Us:

Audio Technologies Inc. SUM100
Summing Amp Stereo w/o PwrSply


The SUM100 Summing Amplifier is an inexpensive, high performance amplifier that is designed as a line level stereo to mono summing amplifier.
Learn More
Our Price: $369.66
List Price: $379.00
Write the first review.
Audio Technologies Inc. SUM100
Usually ships in 7-14 business days.
Need it sooner? Call us!

Related Products

The SUM100 Summing Amplifier is an inexpensive, high performance amplifier that is designed as a line level stereo to mono summing amplifier. It is also useful as a gain block, and as an impedance converter and summing for IHF (RCA type) signals.

The inputs provide balanced 40Kohm bridging impedance for line levels up to +24dBm. The high input impedance allows the SUM100 inputs to also bridge - 10dBu (hi-fi, RCA plug) lines without loading.

Front panel, screwdriver adjust, full range gain controls provide 26dB gain at full clockwise rotation, unity gain at twelve o’clock and a smooth audio taper to full off. The output driver is a servo controlled, ground-sensing circuit, which will supply over +22dBm to 600 ohm balanced loads and +20dBu to high impedance, unbalanced loads. The SUM100 uses rugged XLR type input and output connectors.

Loop-through DC connectors allow several NANOAMPS to share a single external 24VDC power supply. Battery packs and DC-DC converters for portable use are also available.

Up to three amplifiers will mount side-by-side in only one rack unit using the available rack mounting kits. NANOAMPS may also be neatly stacked or mounted side by- side on your desk with the available angled desk mounting kits.


  • Gain: 28dB maximum, 0dB at 12 o’clock pot position
  • Nominal Levels: +4dBu in, +4dBm out to 600 ohm balanced load
  • Peak Levels: +24dBu in, +22 dBm out to 600 ohm balanced load
  • Noise 20kHz B.W.: -90dBm maximum output
  • Harmonic Dist.: .02% Max at Peak Level
  • 20Hz to 20 kHz .005% max at Nominal Level
  • Frequency Resp.: +.25dB, 20 to 20,000Hz
  • Crosstalk: 70dB minimum at 10kHz
  • Input Impedance: Balanced, 40kohm bridging
  • Output Impedance: Balanced, 40 ohms maximum Zs
  • Dimensions: 1.5"H by 5.5"W by 5.75"D; Weight: 1.5 Lb. Net
  • Connectors: XLR (balanced input/outputs)
  • Power: 24VDC @ .07A, connector sleeve is positive
  • Power Supplies: All units require 24VDC power supply, which is ordered separately.
  • Nanoamps can share a single supply-using loop thru DC cable (P/N 20602-1).
  • Do not exceed rated supply current
  • WA100-1: Wall mount power supply (UL), 24VDC @ .4 amp, 115 VAC/60 Hz
  • WA100-2: Tabletop power supply, 24VDC @ .4 amp, 230 VAC/50-60 Hz with IEC 320
  • male 3 pin AC input connector. User supplies matching AC line cord for local
  • power system
  • BBU100-1: Battery Pack unit houses four 9V alkaline batteries (batteries not included).
  • Four-to-six-hour life
  • DC100-1: DC to DC converter powers several units from 12VDC mobile and belt pack
  • batteries. Supplies 24VDC @ .2amp maximum
  • 20602-1: DC power cable assembly for looping the DC power between NanoAmps
  • DESK MOUNT KITS: 20617-501 Angled Desk Mount Base
  • 20617-502 Angled Desk Mount Base and One Stacker (2 units high)
  • 20617-503 Angled Desk Mount Base and Two Stackers (3 units high)
  • 20617-504 Stacker (2 units high)
  • 20617-505 Horizontal joiners for 2 units (side by side)
  • 21075-501: Rack mount system mounts three units in one rack

To be the first to review this item, click here.

Add to Cart

We're sorry, only of this item available

Call a Sales Pro at 800-356-5844 for more information

© 2018 Full Compass Systems, LTD  9770 Silicon Prairie Parkway, Madison, WI 53593  All rights reserved.

We are not responsible for typographical errors in pricing or product specification
inaccuracies in our catalog or web site. Prices are subject to change without notice.