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Old 29th July 2008, 04:51 PM   #1
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Default 2way with CA18RNX or ER18RNX

Hello,

I'm French. Here We can fin the SEAS products at a good price.

I saw a loudspeakers, ProAc 130. It seems to use a CA18 boomer and a vifa DX25 tweeter. It costs 1500€ (2000$) !

I saw the zaphaudio website, with the little SR17 with the ER18RNX and 27TDFC.

I would just build a similar speakers, but with a difference :

- I want a floorstanding speaker. Apparently, the ER18RNX (or CA18RNX) allows a 15 liters cabinet (little floorstanding)

And, is it a good idea to replace the 27TDFC by a 29TFF/W or better
T25CF001 ?

Lastly, somebody use ER or CA18RNX with a simple xover 6db, for example ?

Thanks a lot

Julien
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Old 29th July 2008, 05:17 PM   #2
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Build the SR71 like the way it was designed. You can build a floorstanding with same internal dimensions, or slightly larger cabinet (16-20L) without degrading performance too much.

But the chosen crossover design and drivers are fixed. Don't change one or the other.
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Old 29th July 2008, 06:49 PM   #3
peter_m is offline peter_m  Canada
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What "tktran303" said!

Peter
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Old 29th July 2008, 07:07 PM   #4
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OK, excellent !

I think that i'll go to order the drivers and components !

What are the difference between the zaph audio design (little bookshield speakers) and a floorstanding with 15liters ?

More bass ? or not ?
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Old 29th July 2008, 07:07 PM   #5
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i dont' understand peter ...

Can I build a little floorstanding speakers for the SR71 or not ?

The question is simple !

thanks
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Old 29th July 2008, 08:16 PM   #6
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IMO any speaker can be a floorstander - just build it the height you want but keep the baffle width and internal volume the same.

P.S. - Regarding the T25CF001 Zaph says "Slightly expensive for what you get."
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Old 29th July 2008, 09:05 PM   #7
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As softdome said.

Build the SR71 into a tower but use the same baffle width and tweeter and woofer offsets from the top / sides of the baffle. Design the height of the tower to place the tweeter on axis at listening height / seated position.

Keep internal volume the same by creating a false partition so that the bottom part of the tower becomes a dummy stand effectively, venting port on the top part. Baffle diffraction and step will not be affected significantly by a longer baffle.

Cheers,
David.
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Old 29th July 2008, 09:42 PM   #8
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OK

the madisound cabinet is 14 liters,

I'll try to design a floorstanding cabinet with approximatively the same size.

There is just a problem with the baffle step...

Anybody can help me ? Should I modify something in the crossover ?

I saw the website of J. KIM, he proposes another xover, but his version is very different...
I would prefer use the John "zaph" version...

Thanks a lot
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Old 29th July 2008, 10:25 PM   #9
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Hello boy

Don't touch anything , keep the design at is, building loudspeaker requires skill and tools.

If you want a floorstander just make the cabinet longer keeping the same width, depth and internal volume.

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Old 29th July 2008, 10:58 PM   #10
Andy G is offline Andy G  Australia
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I have nearly finalised a speaker using the ER18 and 27TDFC

http://members.optusnet.com.au/~grad...rrah_stand.jpg

It uses an AR series type of crossover (a different x-o again), which works beautifully.
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