The same PA can sound excellent in one venue and awful in another.
Nothing changed in the speakers.
The room changed.
This is why speaker setup should not begin with “put one box in each corner.” It should begin with the audience geometry, stage location and surfaces that will reflect or absorb sound.
A loudspeaker is not just making noise. It is projecting acoustic energy into a three-dimensional space.
Your job is to put as much of that energy as possible onto the audience, and as little as possible onto:
- Empty walls
- Glass
- Ceilings
- Stage microphones
- Corridors
- Neighbouring properties
The best PA setup is often the one that wastes the least sound.
Start with a floor plan
Before choosing speaker locations, mark:
- Stage/performance position
- Audience seating/standing area
- Room width and depth
- Ceiling height
- Doors and walkways
- Bar/service areas
- Balconies
- Hard reflective surfaces
- Existing rigging points
- Power locations
- FOH/mixer position
For a temporary event, a rough sketch with measurements is enough to improve planning dramatically.
For a permanent installation, this should become a proper system design.
Speaker height is one of the easiest improvements
If a PA speaker is sitting at waist height, the first row of people becomes an acoustic wall.
High frequencies are directional and bodies absorb them.
Raise the high-frequency section above audience head height where practical, then aim it toward listeners rather than over them.
For portable speakers on stands:
- Ensure stands are rated for the load
- Keep legs fully and safely deployed
- Use sandbags/ballast where conditions require it
- Do not create trip hazards in walkways
- Secure outdoor deployment against wind
The objective is not “as high as possible.”
It is high enough to clear near listeners while keeping the vertical coverage on the audience.
Keep the main PA in front of open microphones
For most conventional stage setups, main speakers should be forward of vocal microphones.
This increases gain-before-feedback because the microphone is in the quieter rear/side region of the speaker coverage rather than directly inside it.
A speaker behind a live microphone can sometimes work at low levels, but you are making the feedback problem unnecessarily difficult.
In churches, aesthetics often push speakers back toward the stage wall. That can be workable with suitable directional products and design, but placement needs to be intentional.
Room type 1: small rectangular room
Think classroom, small church hall, restaurant function room or 50-person event.
Good approach
- One main speaker per side of the presentation/stage area
- Raise to sensible height
- Aim inward just enough to cover audience edges
- Keep speakers forward of microphones
- Use subs only if program material needs them
Avoid
- Four speakers in four corners playing the same signal at the same time
- Oversized cabinets firing into the rear wall
- Tops on the floor
- Excessive sub level in a tiny room
Why two corners at the back are a problem
Rear speakers reproducing the same undelayed source can reach listeners at a very different time from front speakers.
That creates smearing and reduced intelligibility.
If rear speakers are required, they should usually become delayed fills, not independent copies of the mains.
Room type 2: long narrow hall
This is one of the hardest common spaces.
The front row might be 3 metres from the mains while the back row is 25 metres away.
If you turn the front PA up enough for the back, the front becomes painfully loud.
Better options
Option A: high-directivity mains
Use a system with enough throw and controlled coverage to project efficiently down the room.
Option B: mains plus delayed fills
Run the main pair at moderate level, then place a smaller fill pair partway down the room and delay them to align with the arrival from the mains.
A rough starting estimate is around 2.9 ms delay per metre of path difference, then fine-tune by measurement/listening.
Option C: line-source/array architecture
For permanent or larger systems, controlled vertical coverage can provide a more even front-to-back result.
Avoid
- Wide-dispersion boxes firing heavily into side walls
- Rear fills with no delay
- Pushing the main PA harder instead of fixing coverage
Room type 3: wide, shallow venue
Think banquet hall with the stage on a long wall.
The audience may be 25 metres wide and only 8–10 metres deep.
The problem is horizontal coverage, not throw.
Good approach
- Choose appropriate wide horizontal coverage
- Consider separate left/right/outfill zones where required
- Keep overlapping coverage controlled
- Use front fills if the stage blocks the first rows
Avoid
- Narrow speakers aimed straight ahead leaving side tables in darkness acoustically
- Multiple adjacent speakers all firing into the same central area
When multiple sources overlap heavily, comb filtering can create inconsistent tonal balance across seats.
Give each box a job.
Room type 4: church sanctuary with high ceilings
Church architecture often looks beautiful and sounds difficult.
Common features include:
- High ceilings
- Hard floors
- Glass
- Brick/concrete
- Large rear wall
- Stage full of open microphones
The main problem may be reverberation, not insufficient PA level.
Good approach
- Use directional loudspeakers
- Aim carefully to keep energy off ceiling and walls
- Consider column/line-source designs for speech clarity
- Use distributed delay speakers for deep rooms
- Control stage volume
- Use acoustic treatment where possible
Avoid
- Solving poor intelligibility by adding high-frequency EQ
- Turning the PA up until direct sound overwhelms the room
- Letting guitar amps and wedges dominate the sanctuary
If the reverberant field is already too strong, more level can make speech less clear.
Room type 5: low ceiling / function venue
Low ceilings create early reflections very close to the listener.
A speaker with excessive vertical coverage can hit the ceiling almost immediately.
Good approach
- Keep cabinets high enough to clear the crowd but not so high they fire over everyone
- Angle downward when mounting allows it
- Use controlled vertical dispersion
- Reduce unnecessary level
- Position subs thoughtfully to avoid excessive boundary loading
Avoid
- Tilting tops upward because the stand is too low
- Mounting speakers directly under low reflective ceiling sections without aiming control
Room type 6: glass and hard reflective surfaces
Modern venues love glass.
Sound systems do not.
Large glass walls produce strong reflections, particularly through mid and high frequencies.
Good approach
- Aim across/away from glass rather than directly at it where possible
- Use narrower coverage
- Use drapes or temporary soft treatment if the venue allows it
- Keep level under control
Avoid
- Using extra HF to “add clarity” when the room is already bright
The harshness may be arriving from reflections, not lack of treble.
Room type 7: outdoor event
Outdoors removes many room reflections, which can make the sound cleaner.
But there is no room helping you.
Level drops with distance, wind affects propagation, and low frequencies can travel into places you did not intend.
Good approach
- Size the system for distance and required SPL
- Use directional mains/arrays where scale demands it
- Raise the system high enough for coverage
- Consider delay systems for deep audiences
- Design subwoofer pattern rather than randomly placing subs
- Protect equipment from weather
- Plan safe power distribution
Avoid
- Assuming the indoor system will cover the same crowd outdoors
- Putting powered speakers where rain can reach them
- Ignoring wind loading on stands, truss or flown systems
- Using mains generators with no power planning
Outdoor production turns acoustic and electrical planning into safety planning as well.
Subwoofer placement changes the room dramatically
People often place one sub under each top because it looks symmetrical.
Acoustically, left/right subs can create a power alley in the centre and uneven bass across the room due to interference between the two sources.
Other arrangements may produce more even results:
- Centre cluster
- Closely grouped mono subs
- Cardioid/gradient arrays
- End-fire arrangements
Which one is best depends on room, stage and number of cabinets.
Boundary loading
Place a sub against a wall and it can gain low-frequency efficiency from the boundary.
Put it in a corner and it may gain even more — but that can also produce excessive, uneven bass.
Do not interpret “louder in the corner” as automatically “better.”
Why speaker aiming matters
Imagine a speaker with 90° horizontal coverage.
If the audience only occupies 50° of that area, a lot of acoustic energy is hitting side walls.
A more directional cabinet might produce better intelligibility with less amplifier power because more energy reaches listeners directly.
This is one reason product selection and placement cannot be separated.
The speaker is part of the acoustic plan.
The FOH position matters too
If the engineer is mixing from a side room, behind glass, under a balcony or at the extreme back wall, they are not hearing what most of the audience hears.
Where possible, FOH should be:
- In the main audience field
- Near the acoustic centreline
- Not hard against a wall
- Not directly in a severe reflection zone
For small events where the mixer must be at stage side, use remote control to walk the room and check the mix from the audience position.
Digital mixers and tablets make this far easier than it used to be.
Plan cable routes before the room fills
Good audio design that creates trip hazards is not good event design.
Plan:
- Signal cable paths
- Power cable paths
- Speaker cable runs
- Network/DMX routes
- Cable ramps where traffic crosses
- Separate mains and signal where practical
- Strain relief
- Weather protection outdoors
For permanent installations, use correct containment, termination, labelling and service access.
The system must be maintainable after the installer leaves.
Power planning
A PA is not just audio equipment. It is an electrical load.
For larger systems, calculate:
- Amplifier/powered speaker requirements
- Lighting loads
- Backline
- Video/LED
- Control/FOH equipment
- Available circuits
- Distribution and protection
Do not put the PA, coffee urn and catering heater on the same unknown extension and hope.
Power problems often sound like audio problems: hum, shutdowns, limiter behaviour, resets and digital equipment rebooting.
Before-event planning checklist
Ask for this information before the truck is packed:
Venue
- Dimensions
- Ceiling height
- Indoor/outdoor
- Floor/wall materials
- Balcony or split levels
- Rigging points
- Power availability
Audience
- Number of people
- Seated/standing
- Seating plan
- Dancefloor position
- VIP/side areas
Program
- Speech only
- DJ
- Full band
- Worship team
- Playback/video
- Theatre
Stage
- Stage dimensions
- Microphone count
- Monitor/IEM count
- Backline
- Wireless channels
Production
- Load-in time
- Soundcheck time
- Crew size
- Noise restrictions
- Curfew
- Weather plan
If you know those things, PA setup becomes predictable instead of improvised.
The “do this first” rule
If a system sounds bad, do not immediately reach for EQ.
Work in this order:
- Position — is the speaker physically in the right place?
- Aim — is coverage pointed at listeners?
- Level — is one source too loud relative to another?
- Timing/polarity — are subs/fills aligned?
- Then EQ — correct what remains
EQ cannot fix a speaker pointing at a wall.
A good PA setup is an acoustic design
The difference between amateur and professional deployment is often not the price of the speakers.
It is whether somebody decided:
- who each speaker is covering
- how loud it needs to be there
- what frequencies it should reproduce
- when its sound should arrive
- what surfaces it should avoid
Once those decisions exist, the equipment has clear jobs.
Without them, people keep adding volume until the room gives up.
Need help planning a PA around a real room? NXT Level Tech handles equipment supply, rentals, installations and system design. Send us the venue dimensions, floor plan/photos, audience layout and program type and we can help plan coverage before the event or installation. Browse PA systems & loudspeakers or book a site assessment.
