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Old 13th January 2007, 06:18 PM   #1
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Default small 2 way system

i am looking to build a small 2 way system.

the drivers i am interested in are:

Seas CA12RCY
Eton 19SD-1

probably want to run seas driver fullrange and use a single cap for eton driver.

what x-over point should i use?
should i use 2 seas drivers to minimize reduction of spl with the baffle step filter attached?

sealed or vented?

if i were to use 2 seas drivers per side i would mount these 2 next to each other vertically and mount tweeter in middle offset.

each channel then would be mirror image.

goal is a very transparent 2-way with excellent transient response and time aligned.

will do more research.

any comments would be appreciated.
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Old 13th January 2007, 08:32 PM   #2
TerryO is offline TerryO  United States
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Default Re: small 2 way system

Quote:
Originally posted by AudioGeek
i am looking to build a small 2 way system.

the drivers i am interested in are:

Seas CA12RCY
Eton 19SD-1

probably want to run seas driver fullrange and use a single cap for eton driver.

what x-over point should i use?
should i use 2 seas drivers to minimize reduction of spl with the baffle step filter attached?

sealed or vented?

if i were to use 2 seas drivers per side i would mount these 2 next to each other vertically and mount tweeter in middle offset.

each channel then would be mirror image.

goal is a very transparent 2-way with excellent transient response and time aligned.

will do more research.

AG,
If you're looking for simplicity, and often it works in your favor, look at your mid-woofer's upper frequency roll-off to see what frequency to shoot for on your tweeter.

Don't bother with the with "the baffle step filter" or for that matter, with a D'Apple layout. Use that 2nd woofer on the back of the cabinet in a bipole configuration wired in series or parallel depending on the rs of the Seas. No filters, etc., to mess up the sound and you haven't had to be bothered with baffle step as the bipole layout cancels it. I don't know what the drivers go for, but inductors and capacitors can be fairly pricey so it may be a wash as far as cost goes.

Sealed or ported? It depends, are you going to use a Subwoofer? If you do, then definately go sealed. A ported cabinet may work if you don't, it is somewhat dependant on the "Q' of your driver. Try modelling it on your software to see what's feasible.
If you don't have cabinet modelling software, there are several that are free and will give good results, just check the archieves on this forum for examples/ opinions.
Good Luck on your project.

Best Regards,
TerryO
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Old 14th January 2007, 02:39 PM   #3
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well the seas driver starts to roll of at 10K on axis.
is -10db down at that f 30o off axis. -20db at 60o.

thats why i can get away with a smaller tweeter.

any good ideas for a 3/4" tweeter?

the seas is 8 ohm but rs is about 6.4 ohms.

the idea of the bipole is good. should i run the rear driver fullrange or throw an inductor on there?

sealed or ported?

well i can use a EBS3 extended -3db shelf alignement and get down to -3 at 50hz starts rolling off towards this point at 200Hz. am hoping room reinforcement would compansate for this.

seal this enclosure and -3 is around 100Hz

so this would be good to add a seperate sub.
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Old 20th January 2007, 03:59 PM   #4
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Default need more ideas..

2-way or 2.5 way??

how about a Dynaudio D 21/2 ?


how is that Seas driver anyhow? anyone had any experience with it running it fullrange?

Thanks!!
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Old 20th January 2007, 04:10 PM   #5
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Default highest x-over f?

just looking at those CA12RCY's what should the highest x-over frequency be?

or alternatively, can i run these fullrange and only throw a cap on the tweeter?

Thanks!!
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