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help with FAST setup
help with FAST setup
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Old 11th April 2017, 12:43 AM   #11
planet10 is offline planet10  Canada
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help with FAST setup
Quote:
Originally Posted by twoNibbles View Post
I did plan on using two. Maybe unnecessarily. Is it not typical to do a sub for the right and left channel?
2 per box? (ie 4 total)

dave
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Old 11th April 2017, 01:14 AM   #12
twoNibbles is offline twoNibbles  United States
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Quote:
Originally Posted by planet10 View Post
2 per box? (ie 4 total)
Ah I see nope. Just one per box was my intention. I'm beginning to feel I've made a wrong turn a couple of intersections back and should about face. Oh well we are on this road now and might as well see it to the end.
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Old 11th April 2017, 01:48 AM   #13
mikejennens is offline mikejennens  United States
This speaker DIY thing, it's pretty addicting!
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help with FAST setup
I think you're headed in the right direction. I've been working on something similar. I plan to go with a plate amp for my woofers. No need to worry about level matching this way; you are basically bi-amping. I would still consider a high-pass on the full-range driver. Relieving it of "bass duty" might help it shine more in other areas.
I have a handful of full-range drivers and a few woofers. I'm trying to decide which to use and how to configure.
Thanks for your post.
Mike
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Old 11th April 2017, 02:22 AM   #14
twoNibbles is offline twoNibbles  United States
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I have read the history of Dave's posts on the Tysen thread. The Tysen V2 is definitely what I am trying to accomplish but far too large for me. I think that I am going to give the passive XO a whirl. Worst case I will invest in plate amps and move on from my foolishness.

Dave, in drawing my box I was shooting for around 11 liters. Maybe this is a foolish question but should my target volume change with the addition of a driver? I will research box design in more depth before committing to an end design.

Thanks, Mike, I get the feeling that I am moving in the correct direction as well. My concern is that I am moving in the right direction in the same way the golf ball is after my stroke. That is to say It will take many more strokes to arrive somewhat near the desired destination.
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Old 11th April 2017, 02:32 AM   #15
mikejennens is offline mikejennens  United States
This speaker DIY thing, it's pretty addicting!
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help with FAST setup
Quote:
Originally Posted by twoNibbles View Post
My concern is that I am moving in the right direction in the same way the golf ball is after my stroke. That is to say It will take many more strokes to arrive somewhat near the desired destination.
That might be, but I'm sure these guys who have the knowledge many of us only dream of started out the same way. Like Edison said though, you won't have any failures, maybe you'll just learn what you don't like.
Anyway, there is a wealth of knowledge on this forum with great folks who readily share. You could very well end up with something you like quite a bit. I have built a number of designs from these gentlemen and have been very pleased with almost all of them. If I don't like a particular design, I put the driver aside and move on to something else. I take my time and kick around a lot of ideas and then pick one and go with it. More times than not, I'm happy with what I've built.
Now I just need to figure out what to do with 10, 15, 20... pairs of speakers in various rooms of my house...
Mike
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Old 11th April 2017, 07:56 AM   #16
scottjoplin is offline scottjoplin  Wales
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I thought you meant 2 woofers per side too. You mentioned that you were thinking of building a larger system in the future, with that in mind I would suggest you go active with this one with a view to flexibility and performance now and the future design.
Using an active crossover with separate amplification allows you to adjust the crossover frequency (I would strongly advise taking low frequency duties away from the uFonken when using the woofers), and the levels.
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Old 11th April 2017, 02:56 PM   #17
Jerms is offline Jerms  United Kingdom
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Quote:
Originally Posted by twoNibbles View Post
I have read the history of Dave's posts on the Tysen thread. The Tysen V2 is definitely what I am trying to accomplish but far too large for me. I think that I am going to give the passive XO a whirl. Worst case I will invest in plate amps and move on from my foolishness.

Dave, in drawing my box I was shooting for around 11 liters. Maybe this is a foolish question but should my target volume change with the addition of a driver? I will research box design in more depth before committing to an end design.

Thanks, Mike, I get the feeling that I am moving in the correct direction as well. My concern is that I am moving in the right direction in the same way the golf ball is after my stroke. That is to say It will take many more strokes to arrive somewhat near the desired destination.
There is probably a better way but....
Small can be done with ND105-8s. WinISD gets 42+Hz in 14+L.
If you want small but lower Hz, the small Tang Band subwoofers will do it.... at the expense of feeding them more power. (W5-1138SMF, W6-1139SIF).

Ideally, a larger pair of woofers and larger cabinets would be used. Ha, but then the FF85s would be sealed too.

J.
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Old 11th April 2017, 04:11 PM   #18
twoNibbles is offline twoNibbles  United States
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OK so I think I have decided that I am going to try to take all of the advice I can here.
-2 silver flutes per side.
-Low frequency XO on both the woofers and the FAs. If I do this should I lift the XO point a bit so that there is better overlap or is ~250Hz probably good still? This is something I can play with on my own.
-I still am not decided on going with plate amps. Is it a reasonable assumption that I could just put the woofers on a separate amp with a passive crossover or is it just a better idea to do the plate amps and get it over with? How much more power would I need for the woofers? I don't think that I understand sound level sensitivity correctly. For reference I have a cheap 30w/channel amp (that is not getting remotely close to 30W/channel) at between 40% and 60% for listening with the uFonken. This is quite a nice level range for me. I clearly don't know how to tell how much more power a more bass capable system would require. Something to research.

-I am, for now, going to keep these as separate enclosures. I have almost a full sheet of cheap 3ply BB on hand that I will make the woofer enclosures out of on an experimental basis. This way if I decide to move on up to plate amps I wont feel bad hacking on a completed box to fit them. Once I am happy I may destroy everything and build a final set as an integrated enclosure. Similar to the Tyson V2 but hopefully more compact and without the angle.

Part of my struggle is ignorance and the other part is not knowing what I actually need. The best system I could build would probably be wasted on me, however, the way vocals shine with these fostex drivers is not lost on me and the lack of bass is also not lost on me. Hence the continuation of this project. Thanks all for your input and for future help as well!
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Old 11th April 2017, 04:42 PM   #19
scottjoplin is offline scottjoplin  Wales
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If you use separate amps for the woofers then you could use a line level passive crossover which goes before the amps, very simple and easy to play around with, have a look at this for starters TLS.org | Passive Line-Level Crossover
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Old 12th April 2017, 02:04 PM   #20
twoNibbles is offline twoNibbles  United States
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OK! I like this and I think this is what I'm going to do.

Are there any signal integrity consequences of this? Seems like the only thing is that the low pass is going to reduce signal amplitude a bit (like 10% if you choose a 5k r1 with 50k input impedance). This should just equate to a bit more of a turn on the power amp knob I suppose requiring a bit more amp headroom. Obviously a change in amp will likely cause a change in filter circuit. Cool any other consideration I have likely missed in my reading?

Thank you for the suggestion!
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