Seas FA22RCZ full range project

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#221
#222
Marcus,

If you´re looking for a simple solution you even can try an open baffle. Seemingly not a perfect match with view to the relatively low Qts but in practise working surprisingly good:

front+seas+1.JPG


Triangular open cabinet:
Now some very promising measurements of the frequency response are available, strongly depending on the position/distance to the rear wall:

M3%255B1%255D.jpg


Regards,
Carsten
 
#223
thanks Carsten, that's interesting and great frequency response ! You must have them quite near to the wall I imagine.
I am using them in open baffle at the moment, but need a sub:

_DSC4687.jpg


There are some interested cabinet designs for the X1-08 EXOTIC F8 ( I think it's for this one, not 100% sure):

SEASSA22RCZML-TL.jpg


Has anyone any info on this design ?
 
#227
Marcus you might try the Warfdale style baffle that 2A3 posted. A lot of folks really like it.
For me it did not have enough bass (with another 8" driver) but you have subs to fill in down low.

The are low enough not to interfere with the movie screen, I think.
 
#231
With the Seas 8" and the woofers you should get pretty good omph. In theory moving the 8" off center will smooth the response a lot. Say ~25cm from the left edge of the baffle. You should be able to bring the subs in under 100Hz.
 
#239
Hi,

I am planning on building a open baffle using a SEAS FR22RCZ. I have a spare KEF C45 (8" in sealed box) which I intend on using to drive the bass.

Overall configuration might look like this. The SEAS will drive upper bass and mids. The KEF C45 will be used to handle low bass (sort of using it as a subwoofer). They will probably be driven by different amps, with something a bit more juice for the KEFC45 and something more refined for the SEAS.

I have some questions on this.

1) Does it makes sense to have a open baffle for a full range speaker followed by a sealed box for another speaker. Does it negate all the nice benefits of a OB?

2) I am probably going to impliment an active crossover. Should I cross for both the speakers? Or should I just cross for bass unit, leaving the full range to run full range? I don't need it to go loud.

3) My intended dimension for the baffle is about 90cm high and about 30 cm wide, the speaker place approximately 2/3 distance from the bottom.The baffle will then be stacked on top of the KEF c45, to form a floorstander approximately 5' tall. I might supplement the high end with supertweeter.

Incidentally how do you find the SEAS FA22RCZ for use in open baffle, compared to other drivers such as Fostek etc?😕

I am a newbie in OB design, but I've dealt with a few fullrangers, fostek, markaudio etc.

Any words of advice is kindly appreciated, no matter how basic it might be.😱

Oon
 
#240
oon_the_kid said:
Hi,

I am planning on building a open baffle using a SEAS FR22RCZ. I have a spare KEF C45 (8" in sealed box) which I intend on using to drive the bass.

Overall configuration might look like this. The SEAS will drive upper bass and mids. The KEF C45 will be used to handle low bass (sort of using it as a subwoofer). They will probably be driven by different amps, with something a bit more juice for the KEFC45 and something more refined for the SEAS.

I have some questions on this.

1) Does it makes sense to have a open baffle for a full range speaker followed by a sealed box for another speaker. Does it negate all the nice benefits of a OB?

2) I am probably going to impliment an active crossover. Should I cross for both the speakers? Or should I just cross for bass unit, leaving the full range to run full range? I don't need it to go loud.

3) My intended dimension for the baffle is about 90cm high and about 30 cm wide, the speaker place approximately 2/3 distance from the bottom.The baffle will then be stacked on top of the KEF c45, to form a floorstander approximately 5' tall. I might supplement the high end with supertweeter.

Incidentally how do you find the SEAS FA22RCZ for use in open baffle, compared to other drivers such as Fostek etc?😕

I am a newbie in OB design, but I've dealt with a few fullrangers, fostek, markaudio etc.

Any words of advice is kindly appreciated, no matter how basic it might be.😱

Oon
Click to expand...


Oon - "full-range / wide-band" drivers are often selected for use in OBs with woofers - this particular SEAS is somewhat larger than those usually implemented, and based on your comments in other threads, you might find them lacking in the top octave or two.

The most common approach I've seen with these types of projects has been running the woofer(s) - ie sometimes 2 per channel - on the same OB as well, but there's probably no reason not to a least experiment with sealed bass drivers - particularly as you already have something on hand . I think how much OB benefit you'd retain would depend on the selected XO point - start experiments in around 200Hz

If you haven't experienced an OB system before, this would certainly be a quick taste test. Keep in mind that for a variety of reasons they (OB) don't work for everyone .

Active XO and bi-amping is certainly a very flexible approach - with sufficient power and level controls on each amp, differences in driver sensitivity become moot.

I'd still be inclined to HP filter the wide-bander to improve power handling / reduce excursion problems.
 
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