what is the primary coil's impedance rating?

Brown to common primary will give about 10K while orange gives about 7K. Blue is around 800ohms, and I haven’t tested the rest. This was all measured by a HealthKit IT 28 which will may have around 10% error; however, those impedances have worked great for my tube amp needs. I hope this helps.

With 6 wires color coded are there instructions on what goes where?

The wiring guide is printed right on the transformer. Connect the primary side to your 70V amplifier using the black primary common and whichever primary tap you want to use based on the watts you want to allocate to that speaker. Connect your speaker using the black secondary common wire plus the wire that matches the impedance of your speaker... 4, 8, or 16 ohm.

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70V 10W Speaker Line Matching Transformer

70V 10W Speaker Line Matching Transformer

Product ID: 20227239

Details

Brand
Parts Express
Current Rating
3 Amps
Mounting Type
Wall Mount
Power Source
Corded
Specification Met
UL

🎧Wide 100-12,000 Hz frequency range

🔊70V constant voltage line matching

🎚️5 selectable power taps (0.62W-10W)

Description

🎵 Transform your soundscape with precision power!

SEAMLESS AUDIO INTEGRATION - Optimized for 70.7V or 25V PA amplifier lines, ensuring crystal-clear sound delivery.
DUAL IMPEDANCE COMPATIBILITY - Supports 4 or 8 ohm secondary impedance, making it versatile for various speaker setups.
PRECISION FREQUENCY RESPONSE - Covers a broad 100-12,000 Hz range for rich, balanced audio across all environments.
EFFICIENT RELIABLE PERFORMANCE - Minimum 77% efficiency guarantees minimal energy loss and consistent sound quality.
POWER FLEXIBILITY AT YOUR FINGERTIPS - Five distinct tap power settings let you tailor output from whisper-quiet to full volume.

The 70V 10W Speaker Line Matching Transformer is a compact, high-efficiency device designed for professional public address systems. It supports multiple power taps and impedance options, delivering clear audio across a wide frequency range while ensuring optimal line matching for 70.7V or 25V amplifier lines.

Specifications

ASIN	B0002KRA1U
Best Sellers Rank	#417,845 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #25 in Audio Transformers
Customer Reviews	4.6 4.6 out of 5 stars (51)
Department	All Ages, Unisex
Item Weight	9.6 ounces
Item model number	300-040
Manufacturer	Parts Express
Product Dimensions	3.03 x 1.93 x 1.77 inches

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