Hearing is Believing

Experience your amp like never before—our hand‑built attenuators deliver pure tube tone at any volume. Crafted in Canada with the finest components for discerning musicians.

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Our Products

Power Sponge Attenuator

The Power Sponge attenuator is a hand‑built, custom‑wired unit that gives you a second volume control for your tube amplifier. Dial in your tone and power tube warmth while keeping your sound at manageable levels.

Plug in and dial in the amount of speaker volume and tube warmth you desire.
Allows the amplifier to be opened up yet at lower sound levels.
Perfect for condos, bedroom sound levels and ideal for recording.
Compatible with 8 Ω, 4 Ω and 16 Ω outputs.

Key Features

Finest Materials

We use only the best quality components for exceptional reliability and sonic purity.

Supreme Audio Quality

Enjoy high‑quality audio ideal for both recording and live performance.

Fully Guaranteed

We stand behind our products with a full guarantee (shipping charges may apply).

Rigid Construction

Built in solid Hammond aluminum enclosures for unmatched durability.

About Us

At JMS Custom Audio we strive to make high‑quality products with unique features and benefits. Our attenuators are carefully hand built to help you achieve the perfect tone at any volume. Please contact us if you have any questions regarding our products and services.

Contact Us

JMS Custom Audio

We strive to make high‑quality products with unique features and benefits. Please contact us if you have any questions regarding our products and services.