FAST FATT EnABL2'd Active Spawn budget behemoth... maybe... help? - diyAudio
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Old 19th January 2016, 10:53 AM   #1
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Default FAST FATT EnABL2'd Active Spawn budget behemoth... maybe... help?

Hi All,

I've been reading diyaudio, a lot of diyaudio, I feel like my head is about to explode from all the information.

A little while ago I was given a few drivers to play around with, and got bitten by the speaker building bug pretty bad, went out and bought MJK's mathcad sheets and went to town building a TMM MLTL.

It was a pretty ok first effort, but now I want more, a lot more. I love the look of big horns, and would love to have a go at building a pair. The wife also doesn't mind how big I build it, so bonus.

First, my room, it's a big room, 6.5m*10m with 2.5m ceiling. The short sides are both mostly glass, one of the long sides is concrete, and the other side is just a normal wall. There is a small bar down one end that doesn't take up much room, and along the wall with the concrete is mostly covered by bookshelves. I have free range to move things around to fit them in. However, they can't be OB, because I have children, and I don't want them poking around the back of the baffle.

Budget, I live in Aus, the "bank" has given me 400-600AUD (275-415USD) probably after the tax rebate in July to spend on the drivers, the rest is whatever it is.

I listen to a large range of things, a lot of my music is high quality digitized vinyl of mint condition and first pressings, the rest is all lossless CD rips. A short list of what I'm currently enjoying in no particular order.

David Bowie
ELP
Pink Floyd
Led Zeppelin (Mastered by Barry Diament of course)
King Crimson
Flaming Lips
Queensryche (Early)
Avantasia
Dream Theater
Disturbed
Loreena McKennitt
Red Hot Chili Peppers
Rachmaninoff
The Cat Empire

As you can see, there is a range of things from classic rock/prog rock, to metal/prog metal, vocalists, ska, funk, and ideally want a system with a good punch to it.

I've read that a FAST system with a FR could give me what I want (Esp. if I use an active crossover, to help with the varied styles I listen to), FATT is me antagonizing Scottmoose (I love your work, you've done some amazing things) Fullrange Assisted Tweeter Technology

What I'm currently stuck on is actually figuring out what drivers, and what enclosure to pop them in. I would love to go all out with a Kirishima and some Sigma drivers, but I don't have the budget for that

I'm open to any suggestions, I'm pretty new to this, but am keen as a bean to learn, so please excuse any ignorance on my part.
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Old 19th January 2016, 12:07 PM   #2
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Considering you like rock/metal/etc FAST is the best way to go. Keep in mind that active cross-over is not cheap. Another idea is to build a pair of pure full-rangers and add one or two active subs afterwards.
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Old 19th January 2016, 01:07 PM   #3
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I don't mind getting my hands dirty, and Rod Elliot has some nice info and projects for active crossovers.
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Old 19th January 2016, 01:24 PM   #4
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Minidsp would be my choice for active crossover. I'll be getting one when my "Bank" allows.
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Old 19th January 2016, 01:35 PM   #5
xrk971 is offline xrk971  United States
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Here is a pretty good sounding FAST that uses miniDSP:

10F/8424 & RS225-8 FAST Ref Monitor

You can save some money by starting with a TG9FD10-8 rather than a $100 10F and sound is about 90% there.

This is my main everyday listening system and plays most music quite well. It does not have high SPL's though.

For that I use the FAST in the Trynergy horn.

Presenting the Trynergy - a full range tractrix synergy.

FAST with a high sensitivity full range driver that can handle a lot of power coupled with a slot loaded open baffle woofer can also sound excellent. Here is an example of that with a 95dB PRV 5MR450NDY and 6 x 6.5in woofers in a SLOB:

PRV 5MR450-NDY for FAST applications
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Old 20th January 2016, 08:37 PM   #6
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Hmmm, those are nice suggestions, but a little part of me has a burning desire to build something obscenely big.

Scott's Kirishima uses FE206EN's, which I can buy in my budget. Is it possible to modify the cabinet for FAST, is it just a matter of mounting the woofer(s) on the side of the speaker chamber? If so, they could be purchased later when budget permits? And finally, what woofers would be suitable.
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Old 20th January 2016, 09:13 PM   #7
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If you want to use FE206En in a FAST, it would best be put in a sealed box (or an aperiodic variation). I'd recommend a smaller driver thou for mid-tweeter.

dave
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Old 20th January 2016, 09:18 PM   #8
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Would any of the Olson-Nagaoka enclosures be suitable for a FAST? Or the BVR's?
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Old 20th January 2016, 09:39 PM   #9
chrisb is offline chrisb  Canada
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CA - unless you really want to experience the learning curve associated with implementing the admittedly excellent information on Rod's page, I'd endorse ewollowe's recommendation for the minidsp - or more precisely, the nanoDSP version which uses outboard DACs - allowing yet another upgrade path


How much of a "behemoth" of a FAST system were you contemplating? I recently finally refinished a pair of bi-amped MTMs using Alpair drivers that work quite well. They are approx 48" tall x 18" wide x 10.5" deep.

Shown below with a pair of FH -lites for size comparison.


The format would easily be adaptable to a fair range of drivers of your favorite flavor; indeed this was my second pair of similar design - the earlier build used FF85K, the current successor to which would be on my short list for consideration for such a project.
Attached Images
File Type: jpg Alpair-MTM-FHL.jpg (76.5 KB, 165 views)
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Old 20th January 2016, 09:50 PM   #10
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Quote:
Would any of the Olson-Nagaoka enclosures be suitable for a FAST? Or the BVR's?
In a FAST with XO 150-400 Hz, you are not trying to extend the bass response, so you have to look at the cabinet for it with a different eye.

We typically use a dedicated aperiodic high taper ratio TL for the midTweeter. Our favorite drivers (so far, many to play with) are Alpair 7.3 & FF85wk (with all the tweaks).

What amps are you going to use? At the moment, looks like the analog sections of a miniDSP could be a weak point in the chain (the digital bit is higely versatile, but limited to 16/48?)… your budget just suggest seeing if you can get away with a PLLXO, really cheap, and if the speaker can be made to suit their limitations, nothing more transparent (2 small Cs+ 1 w R per side for the simpliest one).

dave
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