The $0 Studio Monitors: Rescuing a Pair of Equator D5s

one man’s trash is…

Another man’s gold. A few weeks ago I spotted two Equator D5 studio monitors sitting curbside - complete with the original Equator Audio Research padded carrying bag, foam isolation pads, and cables. Someone had clearly given up on them. one of the woofer cone surrounds was torn, and since Equator went out of business years ago, I get it: no warranty, no service network, no replacement parts. To most people, that's e-waste.

To me, that's a project.

Equator D5 monitor with torn original rubber surround

Equator D5 carrying bag and foam acoustic isolation wedges

Why the D5 Was Worth Rescuing

If you've never heard of Equator Audio, here's the short version. The company was founded in 2007 by Ted Keffalo, who co-founded Event Electronics - the folks behind the classic Event 20/20 monitors. With Equator, the pitch was simple: take the technology from their high-end Q-Series coaxial monitors and squeeze it into a $299/pair box.

Two things made the D5 unusual for its price:

The coaxial driver. Instead of a tweeter sitting above a woofer, the D5's tweeter fires from the center of the woofer. Everything radiates from a single acoustic point, which means better phase alignment through the crossover, a wider sweet spot, and stereo imaging that punches way above the price tag. When a mix is balanced on these, the boxes disappear and you're left with a phantom soundstage. That's the thing people remember about them.

Per-unit DSP calibration. Every D5 has onboard DSP - not for room correction, but for driver correction. Instead of accepting normal manufacturing tolerances, Equator measured each unit at the factory and calibrated it against a reference curve, with final voicing done by recording engineers referencing their own mixes. In 2012, at $300 a pair, that was genuinely disruptive. Reviewers at Tape Op, Mix, MusicRadar, and Sound On Sound all said roughly the same thing: this shouldn't sound this good for this cheap.

Then, like a lot of small audio companies, Equator folded - not because the speakers were bad, but because manufacturing costs, support costs, and cash flow caught up with them. Which is exactly why finding working ones today is hard.

Repaired left monitor installed

The Repair

One woofer needed a new surround. On most speakers, a refoam is a lazy-afternoon job: pull the woofer, scrape the old surround, glue the new one, done.

The D5 does not want you to do this.

Because of the coaxial assembly, the DSP wiring, the front baffle design, and a port tube that's permanently attached to the cabinet, you can't just pull the driver and work on it comfortably. I ended up doing the surround replacement with the cabinet only partially open, and needed a second set of hands to hold the surround in position while I seated it. I'd rather refoam a vintage JBL any day.

This is one of the hardest repairs I’ve done because of the tube port’s permanent attachment. Getting the rubber surround perfectly placed with the rubber cement quickly drying was very difficult but ultimately not impossible. There was maybe a 1/16” point of contact between the surround and the cone with the glue.

One deliberate choice: I replaced the original foam surround with a rubber one. Audiophiles will debate foam vs. rubber forever, but if the compliance, thickness, and mass are close, you're not going to hear a meaningful difference - and rubber won't rot in ten years the way foam does.

The result: the new surround seated evenly around the basket with about a 1/16" offset that's invisible unless you know exactly where to look. No rubbing, no buzzing. And here's the real test - I A/B'd the repaired speaker against its untouched twin, and I can't tell which one I fixed. In speaker repair, ears matter more than eyes. I'll take it.

Original D5 monitor

Repaired D5 monitor (notice slightly off center, still sounds great)

What They're Doing Now

The pair is set up as a second listening system, and honestly, everything people said about the imaging holds up. Sit in the sweet spot with tracks you know inside and out and pay attention to vocal placement, reverb tails, kick/bass separation, and the center image - you'll hear why these developed a cult following.

But the real value isn't the resale number. These monitors represent a genuinely interesting chapter in studio monitor design - a small company betting that per-unit DSP calibration and point-source coaxial drivers belonged in the budget tier, years before that was normal. Somebody threw that in a dumpster. Now it's back in service.

If you ever see a dead pair of D5s at a garage sale or on a curb, grab them. The repair is annoying, but the speakers are worth it - and nobody's making them anymore.

If you’d like to repair a set of D5’s yourself (or any other 5&1/4” speaker) the replacement surrounds can be found here on Amazon. $12 at the time of writing this, so super cheap fix and great quality.

Repaired D5 monitors repaired and installed as my B section of studio monitoring

Thanks for reading ✨