If your church sound system sounds decent in one spot but terrible a few feet away, you’re not imagining things. And the fix might not be what you think.
We sat down with Spencer Trefzger, Churchfront’s Head of Engineering, to pull back the curtain on professional PA design, what makes church audio systems fail, and the practical steps any church can take to get better sound this Sunday. Spencer is the person who architects the audio systems we install at Churchfront, taking concepts from our sales and consulting team and proving them out in software, costing them, drawing them, and making sure they actually work in real life. Here’s what he wants every church tech leader to understand.
The Two Problems We See Over and Over
When churches come to Churchfront saying their audio doesn’t sound right, the root cause almost always falls into one of two categories.
The first is age. Speakers degrade over time just like anything else. You can expect about 10 solid years out of a well-made PA. Some systems will physically survive 18 or even 22 years without breaking, but they won’t stay in tune. The frequency response drifts, becoming inconsistent and inaccurate, full of dips and peaks that force your front-of-house volunteer to fight the system instead of mixing the service. A properly tuned PA should deliver a relatively flat response from low to high. When it can’t do that anymore, your mix engineer is constantly compensating, and the congregation is hearing the result.
The second is poor deployment. Spencer sees this more often than he’d like to admit: PA systems that were installed without any modeling software, without consideration for how multiple speakers interact in a shared space, and without any acoustic treatment in the room. The result is severe phase cancellation, wildly inconsistent coverage from seat to seat, and areas of the room where two speakers are competing at equal volume while other areas have no direct coverage at all.
And then there’s the factor that compounds both of these problems: the room itself. “If your room is not treated acoustically, you can put a Meyer system in there and spend a bajillion dollars on it and it won’t sound right,” Spencer says, “because the room itself is a function of the acoustic energy that we’re mapping. It’s not just direct sound from speakers, it’s reflected sound.”
Why Audio Is the One Thing You Can’t Afford to Get Wrong
Spencer makes a point that’s worth sitting with: of the three disciplines in AVL, audio is the one that matters most in a church context. You can get by with non-ideal video and lighting and still do church well. But if you have bad audio, it makes the biggest dent in your congregation’s ability to worship and engage with the preached word. Speech clarity is where the gospel is shared. Musical clarity is where corporate worship happens. When the PA can’t deliver those things cleanly and consistently across the room, everything else suffers.
What Actually Happens When You DIY a PA
Let’s say you go out and buy a couple of JBLs, set them on subs on each side of the stage, and point them at the congregation. No acoustic treatment, no modeling, no professional installation. Spencer lived this scenario as a youth pastor, and he’s honest about what you get: you’ll hear it, but it’s going to be really different depending on where you are in the room.
The core issue is evenness of coverage, and that’s actually what professional PA design is primarily solving for. Most people think PA design is about loudness, getting enough SPL to fill the room. But virtually every speaker on the market is loud enough for your room. The problem is that when speakers sit at head height on poles, you’re in the plane of degrading sound energy. The inverse square law means you lose half the acoustic energy every time you double the distance from the source. So the front row and the back row cannot possibly be close to the same volume.
Change the geometry by flying the speaker, and you can get 80% of your seating area within plus or minus 3 dB simply by altering the angle of attack. That’s the difference between a room where it sounds roughly the same everywhere and a room where the front row is getting blasted and the back row is swimming in reverberant sound.
Spencer is careful to add a caveat here: he doesn’t want to discourage anyone from doing the best they can with what they have. Not every church has the budget for a professional solution right now, and that’s okay. But understanding the principles of why things sound the way they do gives you the ability to optimize what you’ve got, even before you spend a dollar.
Phase Cancellation: The Invisible Problem
One of the most misunderstood concepts in church audio is phase cancellation, and it’s probably affecting your room right now. Sound moves in waves. When you have multiple speakers in a space, those waves inevitably collide. Where two waves are both at their peak, the sound doubles. Where one is at its peak and the other is in its trough, they cancel each other out. The result is that some seats hear certain frequencies way too loud while other seats hear almost nothing at those same frequencies.
This is an inevitable part of physics. You cannot eliminate it. But you can control where it happens. In a properly modeled system, the worst cancellation zones fall in aisles and walkways where nobody is sitting. In a system that was deployed without modeling, you have no idea where those zones are, and they’re almost certainly landing in the middle of your seating sections.
One of the worst things you can do is line up three or four small speakers along the top of a stage wall thinking that more speakers equals better coverage. Your total SPL might be the same, but you’ve doubled or tripled the overlap between speaker coverage zones. The entire room ends up sounding like a choppy ocean. And mixing different speaker brands on the same main system makes it even worse because the phasing, SPL output, and frequency response are all inconsistent between manufacturers.
What Professional PA Design Actually Looks Like
Spencer walked us through several real designs in Fulcrum One and Meyer MAPP, the manufacturer-specific modeling tools he uses alongside EASE, the industry-standard brand-agnostic software. (Worth noting: EASE Focus, a lighter version, is free or nearly free and can be a great learning tool if you want to model your own space.)
The design process starts with dividing the room into coverage zones, establishing the trim height (how high the speakers can hang), and then selecting speaker models with the right horn patterns to cover those zones with minimal overlap. Every speaker model comes with multiple horn pattern options, such as 75 by 75 degrees, 90 by 50, or 120 by 60, and choosing the wrong one can mean the difference between clean, isolated coverage and a muddy mess of overlapping sound fields.
For a 400-seat room Spencer showed us, two Fulcrum DX15 boxes per side covered the main seating area within about 6 dB front to back at 4 kHz, a key frequency for speech clarity. The design deliberately aims the two boxes on each side so their coverage patterns share the room rather than overlap. One covers the far seating section while the other handles the area closer to front of house. Phase cancellation falls primarily in the center aisle where no one sits.
For a smaller 250-seat new construction in Texas, Spencer achieved full coverage with just a single box per side and one cardioid sub, all running off a single amplifier. No front fills, no delays, and almost the entire room within 5 dB of itself. That’s the kind of value-engineered solution that proves you don’t need a massive budget to get professional results if the design work is done right.
When a Line Array Makes Sense
Line arrays are significantly more expensive than point source systems, but they solve problems that point source can’t. The key advantage is coupling: when line array boxes are hung nearly vertical to each other, they constructively interact to concentrate sound energy into a narrower, more focused projection. Instead of sound fanning out and losing 6 dB every time the distance doubles (the inverse square law for point sources), a coupled line array might lose only 3 dB over the same distance.
This means dramatically more consistent coverage from front to back, especially in rooms with high ceilings, balconies, or significant depth. Spencer showed us a Meyer line array design for Rock Harbor Church where the coverage map from front row to back row was remarkably even, something that would require multiple delay speakers to achieve with a point source system.
Another hidden advantage of line arrays is their consistency from left to right. If you laid a line array on its side and walked past it, it would sound terrible, full of destructive interference. But when oriented vertically and hung properly, the way the boxes interact produces incredibly even coverage across the horizontal plane. Walk from one side of a seating section to the other and the sound barely changes. That engineering achievement is a big part of what you’re paying for.
One detail that surprised even our host Matt: the top box in a line array, the one aimed completely over the audience, isn’t wasted. It’s what allows the rest of the array to couple. Without it, the boxes below it would lose their throw advantage and the back of the room would suffer. Spencer calls it “the Jesus box,” though he notes that unlike salvation, it’s unfortunately not free.
Three Things You Can Do Right Now
Spencer’s practical advice for churches that want better sound comes down to three priorities, in order.
First, treat your room. Unless your PA is physically broken with torn cones or failed components, acoustic treatment is the single highest-impact improvement you can make. Spencer recommends aiming for at least 10% coverage on side and rear walls with absorptive material. Churchfront’s partners at Primacoustic offer a free room calculator on their website where you can input your room dimensions, surface materials, and intended use, and get a recommendation for how much treatment you need and what it would cost.
Second, have your system professionally tuned. Even if you don’t buy any new equipment, getting a qualified technician to measure and tune your existing PA can make a dramatic difference. You may need a DSP processor, which typically runs between $1,000 and $3,000, but the tuning process can identify and correct trouble frequencies in the speakers and the room that your front-of-house volunteer has been fighting every Sunday. Most PA systems were either never tuned properly or have fallen out of tune over the years.
Third, if your system is past its lifespan, replace it. These systems aren’t designed to last 50 years. If you’re running an 18 or 22-year-old PA, it’s time. And here’s the encouraging part: you don’t have to jump straight to the top-shelf brands. There are professional-grade speakers in the $800-per-box range that will dramatically outperform an aging system, as long as the design and deployment are done correctly. The critical thing is to not DIY the installation. Speaker rigging is a serious safety concern that requires the right tools, equipment, and expertise. Get a professional integrator involved, even if it’s just for the modeling, the hang, and the tune.
Stop Mixing from Behind the Booth
One of the most actionable pieces of advice Spencer offered has nothing to do with buying gear. It’s about how you mix.
Get out of the booth during rehearsal and walk the room. Pick a row and walk the entire width of it. Listen for where you start hearing one speaker more than another. Notice where the sound gets muddy or where certain frequencies disappear. Map it with your ears. You might discover that six rows in the front have no direct speaker coverage at all, which is exactly what Spencer found at a church near him that had deployed their PA without any modeling.
Low end is especially deceptive from the mix position. Subwoofer energy doesn’t follow the same rules as mids and highs. It’s less directional, heavily influenced by room shape, and the booth itself can actually block some of it. Spencer’s advice: go stand about a quarter of the way off center in one of your main seating sections, dial in the low end until it feels right, lock it in, and don’t touch it week to week. Otherwise you’ll end up in the common trap where the front row is getting hammered by bass, the back row hears nothing, and you at front of house think it sounds amazing.
The Bottom Line
A well-designed PA system isn’t about having the loudest or most expensive gear. It’s about even coverage, consistent frequency response, and a room that works with the system instead of against it. When those things are right, your front-of-house volunteer stops fighting the system and starts actually mixing. Your congregation hears the same experience whether they’re in row 2 or row 20. Your pastor’s voice is clear and present in every seat. And your worship team’s musicianship actually translates to the room the way they intended.
The difference between a professionally designed system and a DIY deployment isn’t just audible. It’s the difference between your tech team mixing uphill every Sunday and a system that practically runs itself.
If you’re not sure where your PA stands or what the right next step is for your room, jump over to churchfront.com and get on a call with our team. Whether it’s acoustic treatment, a system tune, or a full PA design, we can help you figure out the right solution for your church and your budget.
