DIY speakers mainly for heavy metal

Yes Troels's Loudspeaker must be good, and almost similar performance can be achieved with cheaper xo parts. Bass driver has dsp and own amp.

This might be right-on! Faital-3WC-15
Passive 3-way with high efficiency and low tuned reflex gets my acceptance. Faital and BC drivers are not very expensive. Box can be more simple and felt lining on the walls of bass box is not needed.
 
I doubt they will go very loud. A wrt directivity well designed 8" mid -1" high would be crossed not too high (if one is not about that oldfashioned 8" - 0,75" sound). The tweeter is crossed 2nd order electrical. System output therefore will be limited at either tweeter linear excursion or at tweeter power dissipation (seen too much big systems with blown tweeters in my life I guess...).
 
Yes, you're right. So this would not be the classic Spendor approach, but still crossing an 8" and an 1.25" at 2,5k likely implies an irregular power output around the crossover frequency. Troels doesn't publish polars and I am inclined to say I know why.
 
But if ready-made are possible, how about these?
XLS 215 CERWIN VEGA Floorstanding Tower Speaker
Cerwin Verga has a reputation as a "Party Speaker" but in a rather big surprise the very snobbish Hi-Fi mag The Absolute Sound gave that model (or close) a glowing review a few years back. What a shock! They sound good and they rock. 🙂

While I certainly love and live the DIY life, the Cerwin seems like a great deal (maybe a good used pair?) Here in my little mountain cabin I have a pair of old Cerwin-Vega 2 ways and they super enjoyable. PA/pro style speaker is what you want for sure. DIY or ready made.
 
A proven EconoWave design with a 12" midbass and a 1" compression driver on a 90x40 dispersion horn, PLUS an 18" ported woofer is a frequently used high output speaker topology. $500 per speaker for drivers and crossover parts. BiAmping the woofer greatly simplifies design and supports higher output bass.
 

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The area the speakers will be in is an unfinished section of the basement, 8' ceilings and say 30' by 50' without taking specific measurements so not a small, but not a huge space.

That's loaded with potential.

Do you own this place? If so, keep your options open if you do finish that section of the basement. Don't block possible upgrade options.

- consider how you'd lay things out if you decide to make a soffit mounted system.

- consider the possibility of adding infinite baffle subs.

For example, instead of building a couple of fridge-sized subwoofer boxes, you could simply wall off the corners of your room - making that wall from a fat layer of heavily braced ply - and mount your woofers into those walls.

Random example of soffit mounting:
pics

Infinite baffle forum:
Home | "Cult of the Infinitely Baffled" Hear The Bass, Not The Box The definitive online resource for Infinite Baffle subwoofer design Established 1999
 
A proven EconoWave design with a 12" midbass and a 1" compression driver on a 90x40 dispersion horn, PLUS an 18" ported woofer is a frequently used high output speaker topology. $500 per speaker for drivers and crossover parts. BiAmping the woofer greatly simplifies design and supports higher output bass.

This.

This is essentially where I am headed. Always wanted JBL 4345, but that's a bit of a long term goal that may not get realized. I've got the 18" and a bunch of 1" drivers and waveguides.

I listen to just about everything and metal is one of them. Try Gojira "Drum Solo" for testing a rig. Always feel like it's gonna kill my stereo 😀
 
Yep. The drums hit hard and almost sound like things will explode. The visceral impact and slam is fun.

There is lots of good metal I enjoy, but not all of it was recorded the best. Especially some of the newer stuff, as it becomes a mess of compression and loudness. Always keen on finding new metal I can enjoy on a critical listening level.
 
I find these to be references as far as metal go:
Nightwish - Dark Passion Play Special Edition (with orchestra)
Becoming the Archetype - Dichotomy (Heavy Devy produced)
Mortification - Scrolls of the Megilloth (well produced, plenty of level left, before loudness wars)
Paramaecium - Time to Mourn (very dry 2-piece recording, very well done)
Meshuggah - Nothing (either pressing is good, less effects on gold version)

Later,
Wolf