O-Town Sounds
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A Different Kind of Build

Replacement Amps for DefTech BP700x Towers

A drop-in amplifier kit for Definitive Technology's BP700x series towers — because a dead amp plate shouldn't mean a dead speaker.

BP7002 / BP7004 / BP7006 Class D Amplifier Drop-In Fit
Sound Familiar?

The Dread Is Real

As DefTech owners, we all know the dread of firing up your home theater only to find one of your channels has gone silent — no bass, no fill, just a dead tower where music used to be. For years, Definitive Technology serviced these amps in-house. But as the company changed hands over time, that legendary service fell by the wayside, leaving owners searching for solutions.

The BP700x series bipolar towers (BP7002, BP7004, BP7006) rely on a proprietary amplifier plate that's notorious for failing — and DefTech doesn't sell replacements. When it dies, repair costs have often run north of $300 per amplifier.

O-Town Sounds stepped in with a drop-in kit that fits the factory cutout exactly, so a dead amp plate doesn't mean a dead speaker. It's built on modern, off-the-shelf components designed around serviceability — if something ever fails, it's a quick swap with a few hand tools, not another shop visit. Give your speakers new life, with a little modern flair.

How It Works

What's in the kit

Amplifier
ZK-6001 Class D module, built around the TPA3255 chipset — clean, modern power sized to fit the original amp cavity instead of a bulky aftermarket box.
Power Supply
Each kit ships with an external 48V 10A power supply, sized to fully power the new amplifier. Mount it to the back of the speaker with the included brackets, or just set it on the floor — your call.
Level Converter
A custom passive high-to-low-level converter (HLC) board, so the kit accepts your existing high-level speaker inputs without adding a separate line-level preamp.
Backplate
A 3D-printed backplate engineered to match the factory mounting pattern exactly — all 11 cabinet screw holes, knob cutouts, and terminal holes line up with the original. Printed in PETG for durability.
Install
Designed as a true drop-in replacement: remove the failed factory amp plate, mount the new backplate using the existing cabinet hardware, and reconnect your speaker leads. No modification to the cabinet required.
Order Yours

Pricing

No deposits, no waiting on a pre-order round. Order direct and pay in full at checkout — every kit is built and bench-tested here in Orlando before it ships.

Price
$215
Per amplifier kit — paid in full at checkout
In the Box
Complete
Amp, HLC board, 48V power supply, backplate & hardware
Warranty
90 Days
Against component failure — we repair or replace it
How Ordering Works
Step 1
Order & Pay Online
Step 2
Built & Bench-Tested
Step 3
Ships to Your Door
Buy Now — $215
Secure checkout through Square · Outside the US? Email for a shipping quote
Questions

Frequently Asked Questions

Can't I just bypass the factory amplifier and use my own amp?
Short answer: yes. But most owners don't want to buy a separate amplifier, or don't have a receiver or preamp with line-level outputs to feed one. The O-Town Sounds amp is designed to be a direct replacement — no extra gear required.
Will it sound the same as the factory amplifier?
Yes — but keep in mind it's a different amplifier, so like any new piece of audio gear, it'll take a little tweaking to dial in. That's why each amp has an external volume and crossover knob, so you can get your sound just right. Or grab a pair and upgrade both towers for a seamless match.
Is there a warranty?
Yes. Every amplifier is warrantied for 90 days against component failure. If something does fail down the road, we keep parts in stock for quick, inexpensive repairs.
Will these amplifiers work with other Definitive Technology speakers?
Not yet, but it's coming. We've had a ton of requests for the BP8000 series, so expect that soon. BP7001 and BP7000 owners — we hear you too. Those towers were built with a bit more black magic, so we're working through designs specific to them. Drop us a line if you need one and we'll add it to the list.
Why did you decide to do this?
“As a longtime DefTech owner — and a former home audio installer — I've lost count of how many dead speakers I've seen over the years. I've repaired the amps on three of my own BP7002s, plus both of my Mythos ST speakers. My local audio shop stayed busy with me hauling towers in every few years. I wanted a solution anyone could do themselves to bring their speakers back to life — nobody buys a $1,000 pair of speakers expecting to spend weeks with them in a repair shop.”— Jon, Founder
The Build

A closer look