Your cart
Chat
Contact us
Close contact box
Connect ID #
772 918 288 3
Connect ID #
772 918 288 3
All finished with your chat session?

We’ll email you a transcript of this conversation for your records.

All of our representatives are
currently chatting with other customers.

Please enter your name.  
Please enter a valid email address. Why is this required?
Please enter your US phone number.  

For Tech Support, call 1-888-292-2575

Thank you, !
Our conversation will be emailed to
Chat Advisor Image

Your Advisor,

More about me
Please enter a question  
Don't wait on hold. We'll call you back when it's your turn to talk with the next available .
Please enter your name  
Please enter your phone number  

Please enter a message  

Calls may be recorded for training and quality control purposes.

We are located in Virginia USA.

OSD BK-100W70T

70V commercial transformer

Item # 452BK1HW70

This transformer lets you convert an 8-ohm speaker for use in an indoor 70-volt distributed audio system.

This transformer lets you convert an 8-ohm speaker for use in an indoor 70-volt distributed audio system.

Item # 452BK1HW70

In stock
$39.99 each

Need an expert?

Our Advisors know their stuff and love to help.

Articles, videos & DIY info

Decades of expertise at your fingertips.

60-day price protection

We’ll reimburse you if the price drops.

About the OSD BK-100W70T

Convert 8-ohm speakers to 70-volt use

The OSD BK-100W70T indoor transformer allows you to convert standard 8-ohm speakers into 70V speakers for use in a commercial-style custom-installed sound system. With taps at 20, 40, 60, 80, and 100 watts, it allows you to daisy-chain the 8-ohm speaker together with multiple additional 70V speakers, all driven by a single amp. It is rated for indoor use only.

Product highlights:

  • lets you convert a standard 8-ohm speaker for use in a 70-volt distributed audio system
  • selector for choosing 20, 40, 60, 80, and 100-watt taps
  • color-coded, in-wall rated 18-gauge wire leads included
  • 4"W x 2-3/4"H x 2-1/2"D
  • weight: 1.8 lbs.
  • warranty: 2 years
  • Our 60-day money-back guarantee
  • MFR # BK-100W70T

What's in the box:

  • 70V Transformer with 7.5" wire leads and attached mounting bracket (adhesive backed)
  • Wiring & Specification sheet

Customer reviews

We don't have any reviews, yet.
Submit a review and then enter to win a $350 gift card.
Be the first to review this product

Loading reviews...

Thanks for submitting your review

Filter by rating

Customer photos

Sort reviews

Sort by:
Items per page:
View page:

Verified customer (What's this?)
Verified employee purchase (What's this?)

Pros:

Cons:

Crutchfield response

<< >>

More details on the OSD BK-100W70T

Stacey B.

Product Research

Features

Overview: The OSD BK-100W70T line-matching audio transformer lets you power 4- or 8-ohm speakers from a commercial 70V amplifier, letting you deliver high wattage over long speaker wire runs. Featuring taps at 20, 40, 60, 80, and 100 Watts, the BK-100W70T lets you connect speakers up to 2000' away using 14 AWG wire, making it an ideal solution for commercial installations where distance is an issue. The transformer has a frequency response of 20Hz-20kHz with little insertion loss and no effect on sound quality.

Mounting: The OSD line-matching audio transformer is pre-attached to an angled mounting plate for installing it on the back of a speaker magnet. An adhesive pad on the the mounting plate allows it to be attached to the speaker without the need for mounting hardware.

Wiring: The BK-100W70T features six input wires for connection to a 70V commercial amplifier, offering five wattage options for your connected speaker. Each wattage can be selected by using a color-coded input wire. Three output wires are used for connection to either a 4- or 8-ohm speaker.

  • 70V Amplifier Input (Primary):
    • Black: Common negative
    • Brown: 100W (50Ω)
    • Red: 80W (62.5Ω)
    • Yellow: 60W (83Ω)
    • Blue: 40W (125Ω)
    • Green: 20W (250Ω)
  • Speaker Output (Secondary):
    • Black: Common negative
    • White: 4Ω
    • Red: 8Ω

Specifications:

  • Primary Voltage: 70V
  • Power Rating: 100W
  • Primary Taps: 100W, 80W, 60W, 40W, 20W
  • Secondary Impedance: 4- and 8-ohms
  • Insertion Loss: 1dB
  • Frequency Response: 20Hz-20kHz (± 1dB)
  • Dimensions: Width = 3.91", Height = 2.71", Depth = 2.48"
  • Weight: 1.8 lbs.

Loading accessories...

Customer Q&A

Loading articles...

TOP
Compare the sound