Help Choosing DIY Speakers for Large Room

Wooden shelf full of objects works well as diffusion.

Instead of building diffusion panels, told people many times shelfs with lots of random objects also diffusion.

Wife friendly sound design =

Diffusion panel = large pretty full wall shelving , lots of dividers and random pretty stuff objects.
Absorption Panels = Full wall floor to ceiling drapes, add accent lights for points.
Bass trap for small rooms = huge big fluffy couch at end of longest wall.

Your seating is not against the wall, mid room. No boundaries near you.
Very helpful.

When I delivered furniture and designed rooms for high end homes.

We often made the joke, among furniture delivery guys
You can tell how rich people are by how heavy their bedroom set is
And if you can walk all the way around the couch and not hit a wall.

Last high end home I did had floor trim and crown moulding...in the garage
 
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It doesn’t have to be a Troels design as long as the project is well-documented, uses premium drivers (Scan-Speak, SBA, Accuton, or higher), and the total cost remains under €5,000 for the complete build (minus the cab of course).

IMO it seems too early to be setting the budget, brand, etc... I'd first give it a shot at listening to commercial offerings.
Perhaps you'd be better served by PA bits and waveguides. Premium brand name drivers are overrated.
 
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1. Treat your room as much as possible. If it's still getting built, you can add diffusers/bass traps/sound absorbing panels etc before furniture comes in. Something on the ceiling that is not flat can help avoid standing waves.
Yeppp, room is still being built, and 100% agree with you about the ceiling, that's why I'm adding ceiling borders and wooden logs are coming in the ceiling as well, hopefully to kill those nasty 90 degree angles.


Linkwitz's open baffle speakers will sound and "mate" in your room very differently from a JBL horn.
I've never heard the linkwitz before, but I do like and open to the idea of an open baffle speakers.

Thanks for the info mate 🙏
 
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Wife friendly sound design =

Diffusion panel = large pretty full wall shelving , lots of dividers and random pretty stuff objects.
Absorption Panels = Full wall floor to ceiling drapes, add accent lights for points.
Bass trap for small rooms = huge big fluffy couch at end of longest wall.
My wife's gonna be happy about this, thank you so much 🤣

When I delivered furniture and designed rooms for high end homes.

We often made the joke, among furniture delivery guys
You can tell how rich people are by how heavy their bedroom set is
And if you can walk all the way around the couch and not hit a wall.
We just purchased this house and we're so happy about it, it's our dream house and we're treating it as one. 🙏
 
Rather than getting into specific types an overview of cabinet types is the thing to do first.

Transmission Line cabinet design works well for your listening requirements, these are forward 'firing' with vents at the base.
Floor-standing types that tend to be deep but with a narrow fascia, they often have good proportions.
They have non resonant bass that will extend accurately an octave lower than anything for the cabinet size,
this helps keep the midrange clear and less distorted.
In acoustics the transmission line is as close to ideal as we can achieve, being both an 'infinite baffle' at the same time as being an open damped line.
These are often not made by companies due to their complex tapered or folded line and their final weight. Ideal for the DIY'er to get the best out of that design. If you can find John Wright designs you'll be in hog heaven!

Tuned ports will always resonate at a particular frequency in the bass and can be really irritating if you know your music.
This design 'loads' the box, not the room.

Passive radiators also provide accurate bass extension, they are technically closed cabinets and more restricted.