What I'm Comparing, and Why It Matters
I've been handling pro audio equipment orders for installers and rental companies for 9 years. In that time, I've personally made (and documented) 15 significant purchasing mistakes, totaling roughly $18,400 in wasted budget. Most of them came from one bad assumption: that the cheaper upfront option would be cheaper overall.
This comparison is between two options that keep coming up in venue upgrade conversations: used or vintage Electro-Voice gear (the Interface D is the one I know too well) and modern powered speakers (the EKX-15P is the one I eventually switched to). I'm comparing them across five dimensions: upfront cost, hidden maintenance costs, repairability and reliability, sound and application fit, and portability/setup. No filler. Just the tradeoffs that actually affected my budget.
1. Upfront Price vs. Total Cost
It's tempting to think a used Electro-Voice Interface D for sale at $400 a pair is a steal compared to a new Electro-Voice EKX-15P powered 15" 2-way speaker at roughly $900 per box. But that math falls apart fast.
I bought two used Interface D units in March 2019 for $850 total. Looked like a win. By the time I was done, I'd spent another $620 on reconing, a replacement crossover capacitor, and a used amp that could actually handle their power requirements. Total: $1,470. And that doesn't count the 11 hours of my own time chasing parts and wiring everything up.
The EKX-15P, by contrast, is self-powered — no external amp needed, no reconing, no guesswork. What I mean is that the "cheap" used option isn't just about the sticker price. It's about the total cost including your time spent managing issues, the risk of hidden damage, and the potential need for professional service. The lowest quoted price often isn't the lowest total cost.
2. Repairability and Reliability: The Legacy Myth
The "vintage gear is easier to fix" thinking comes from an era when speakers were simple: a driver, a crossover, a box. That's largely still true for the Interface D. But here's what that advice ignores: finding those parts today is a different story.
In September 2022, a client's venue had an Interface D go down the night before a show. I spent four hours calling suppliers for a replacement driver. No luck locally. We ended up substituting a modern EKX-15P from our warehouse. It saved the gig, but it also taught me that "repairable" doesn't mean "quickly repairable."
Modern powered speakers like the EKX-15P are modular — if the amp module fails, you swap it. If the driver fails, you replace it. The parts are current, in stock, and documented. Not always cheaper, but faster. And in live sound, faster is often worth more than cheaper.
After the third late delivery from the same parts supplier that year, I was ready to give up on vintage gear entirely. What finally helped was building a buffer into our schedule rather than trusting their estimates. Not ideal, but workable.
3. Sound and Application Fit (Where Vintage Actually Wins)
This is the one dimension where I expected the EKX-15P to dominate. It mostly does — more output, cleaner highs, tighter low-end control. But the Interface D has a warmth that some jazz and acoustic venues genuinely prefer. That's not nostalgia; it's a different frequency response curve.
The catch is coverage and loudspeaker noise pollution. The Interface D's older horn design has a narrower dispersion pattern. In a small venue, that means less sound spilling into neighboring spaces — which is actually a good thing if you're dealing with noise complaints. The EKX-15P spreads wider, which improves coverage but can cause more noise issues in residential areas if you're not careful with aiming and level control.
I went back and forth between keeping the vintage rig and switching entirely to powered speakers for two months. The vintage rig sounded great, but the setup was killing us on tight timelines. We ultimately switched because the labor cost of moving and wiring passive speakers was eating our margin on smaller gigs. The decision kept me up at night. On paper, keeping the vintage gear made sense — we already owned it. But my gut said the setup time was unsustainable. My gut was right.
One clarification: if you're looking at an Audiovector R8 Arreté loudspeaker, that's a different category entirely. That's home hi-fi, not pro PA. I've seen installers compare them by spec sheet and get confused. They're built for different rooms, different volumes, different goals. Don't cross-shop them. Similarly, a portable audio mixer pairs with either option — I've used a small Yamaha mixer with both the Interface D and the EKX-15P. The mixer isn't the bottleneck. The speakers are.
4. Portability and Setup: The Hidden Labor Cost
The EKX-15P weighs about 53 lbs. The Interface D (with its required amp) can easily exceed 80 lbs per side once you factor in the amp rack. That difference shows up in setup time and back strain.
For mobile work, this matters. A lot. If you're loading in and out three times a week, the passive rig will cost you in labor what you saved on the purchase price within a few months. I ran the numbers after six months with the vintage setup: we were spending an extra 45 minutes per event on setup and teardown. At our labor rate, that was $135 per event in extra cost. That's $7,020 a year on 52 events. Not so cheap anymore.
5. Resale and Upgrade Path
Vintage Electro-Voice gear holds value — sometimes surprisingly well. The Interface D units I bought for $850 total eventually sold for $700. That's a $150 loss over three years, which isn't bad for a rental asset. But the EKX-15P also holds value reasonably well because it's a current product with parts support. Neither is a terrible investment. The difference is that the EKX is easier to sell because buyers don't need to worry about finding an amp or sourcing parts.
So Which Should You Choose?
Choose used/vintage Electro-Voice (like the Interface D) if:
- You're installing in a permanent venue where setup time doesn't matter
- You have a relationship with a tech who can service older gear
- You specifically want that warmer tone for jazz, acoustic, or low-volume applications
- You've factored in the cost of an external amp and potential repairs
- You're comfortable with the risk of parts shortages
Choose modern powered speakers (like the EKX-15P) if:
- You need reliability and fast setup for mobile or rental use
- You don't want to deal with external amps and crossover wiring
- You need current parts availability and manufacturer support
- You want predictable performance without the "will it work tonight?" anxiety
- Your venue has noise ordinance concerns — the wider coverage can be tuned and aimed carefully, while the vintage horn's narrow pattern might actually create hot spots that upset neighbors more
One more thing. Per FTC guidelines (ftc.gov), any seller offering used gear must clearly disclose its condition. If you're buying an "Electro-Voice Interface D for sale" online and the listing doesn't mention reconing history or amp requirements, ask. A seller who won't answer isn't a seller you want to deal with.
I'd rather spend 10 minutes explaining these tradeoffs than deal with another $600 mistake. An informed buyer asks better questions and makes faster decisions. That's the whole point of this comparison — not to tell you which is "better," but to help you figure out which is better for your situation.