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-   -   Floorstand, 2 way, very low crossover(+with waveguide) (http://www.diyaudio.com/forums/multi-way/64095-floorstand-2-way-very-low-crossover-waveguide.html)

Alexnick 11th September 2005 03:10 PM

Floorstand, 2 way, very low crossover(+with waveguide)
 
Hi,

As I've seen on my previous post about Amphion Argon2, I'm wondering if
it is possible to do something pretty close, but as a floorstand!

So my idea is to take a good 8" speaker, put it in a 30-50Liter enclosure
and cross it as low as possible, with an waveguide tweeter!
I want a low F3(as low as possible, but without compromising the TRANSIENT
RESPONSE).


The are some problems though:
Choosing the right speakers to suit this design
Choosing the correct xover frequency
Harmonics coming through the port
Choosing the port position(front-firing, down-firing, rear-firing)
to achieve a compromise between bass response and harmonics coming
out through the port
Doppler distorsions that appear when there is a high xover point
Woofer's harmonic distorsions when going to upper frequency limit
Woofer's low frequency response
Woofer's off-axis response at high frequencies
Tweeter's low frequency response
Tweeter's harmonic distorsions when going to lower frequency limit
Calculating the horn dimensions

I'll write later the problems that I forgot to mention here!

First, I need some suggestions, for the speakers that would be suited
for the project!



Please write here every link that you think it might be helpful!

Dumbass 11th September 2005 03:31 PM

For the enclosure, I would go for a mass-loaded (i.e. vented) transmission line. You'll want a driver that has moderate Qts (.4 to .5-ish) and, of course, low Fs. Hi-Vi has a number of 8" drivers (partsexpress.com) that look promising.

To get some idea for how large the enclosure will be (1) do calcs for an alpha-TL from Rich Schultz's article and (2) model the enclosure as a simple bass reflex. Then fiddle with Martin King's worksheets and end up somewhere between (1) and (2).

http://www.t-linespeakers.org/readme1st.html

Alexnick 11th September 2005 03:45 PM

The enclosure will be vented, because I want some punch!

Madmike2 12th September 2005 12:27 AM

I am all sealed cabinets and i have Lennox Lewis punch dude ! :dodgy:

paulspencer 12th September 2005 06:32 AM

I was about to suggest a TL as well! But I don't think "punch" and a very low F3 with an 8" midbass go hand in hand ... at least, not my idea of punch.

Perhaps if you actually aimed for 50 Hz, then crossing to a sub with some punch? Or some vented woofers which move a bit more air?

Alexnick 13th September 2005 06:10 AM

There is a difference between TL and vented, and I think I'll like vented more!
SO vented shall be!

Dumbass 13th September 2005 06:40 AM

Quote:

Originally posted by Alexnick
There is a difference between TL and vented, and I think I'll like vented more!
Why?

(BTW TLs are vented.)

Alexnick 15th September 2005 10:31 AM

BR is more punchy!

However we need to find a pair of woofers and tweeters that
are the best for my goals!
So suggestions?

Alexnick 30th September 2005 06:43 PM

Come on guys!
Any suggestions for the 8" and the tweeter?
Let's say you had 200 Euros(excluding the 40% taxes that I have to pay to get the speakers) what would you buy?

ShinOBIWAN 30th September 2005 07:19 PM

40% import tax!!!

Now that is a joke.


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