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SEAS FA22RCZ build
SEAS FA22RCZ build
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Old 13th March 2021, 07:01 PM   #1
11opas is offline 11opas  Canada
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Default SEAS FA22RCZ build

I have been enjoying these for the last few weeks now and I'm very impressed! I used the plans Scottmoose released for a large vented cabinet for the FA22RCZ. I used walnut ply for the sides and Baltic birch for the front and rear baffles (front has walnut veneer). The bracing was not in the plans but was recommended. I did use a 1.5mH inductor in series with a 15 Ohm resistor (as per the Seas application note) to tame the HF but with this small change I find these hard to beat! They are one my favorite builds to date! Thanks to the exceptional cabinet design and Scott for posting it!
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Old 13th March 2021, 08:27 PM   #2
GM is offline GM  United States
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Old 13th March 2021, 08:50 PM   #3
planet10 is offline planet10  Canada
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SEAS FA22RCZ build
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Old 13th March 2021, 09:00 PM   #4
alfegutt is offline alfegutt  Norway
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Congratulations, it looks really good. Your box is quite wide, pushing baffle step toward 200 hz I guess. I assume that it produces that midbass "push/thump", which slim modern speakers just cannot match.

My favourite DIY is also a SEAS FA22RCZ, playing on it just now. I have, however, chosen a sealed enclosure, also quite wide (36 cm). I use a MiniDSP to linearize the frequency and boost the bass a bit. It both measures well, and has a nice sound stage.
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Old 14th March 2021, 12:13 AM   #5
oon_the_kid is offline oon_the_kid  Malaysia
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I find adding supertweeter helps in providing sparkle to the sound. Try a small tweeter maybe a 1/2inch with a 1 or 2 uF capacitor in series. I found it helps a lot.

Oon
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Old 14th March 2021, 04:57 AM   #6
norman bates is offline norman bates  United States
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Nice
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Old 14th March 2021, 05:01 PM   #7
11opas is offline 11opas  Canada
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I have had some time to play around and actually built a smaller sealed version of the same cabinet... For smaller rooms I prefer the sealed version with its super fast and tight bass, even if it doesnt dig quite as low as its bigger brother... I can get similar results by stuffing the ports in the bigger version when moved to smaller rooms but they do have a much bigger foot print...
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Old 14th March 2021, 05:53 PM   #8
Scottmoose is offline Scottmoose  United Kingdom
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Nice work indeed.
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Old 14th March 2021, 07:58 PM   #9
alfegutt is offline alfegutt  Norway
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Great work "11-opas". I agree that the sealed-bass is faster, and I like it better. It can, however, be further improved.

I am therefore currently starting to build a bass for my fullrange. It is inspired by the Dutch & Dutch 8C, Allison effect.

- Rear firing 8" sealed, 10 cm from front wall
- Each bass is placed behind each Seas FR
- Delay the front firing Seas FR accordingly
- XO 200 hz LR 48 db
- Using a FIR to linearize the filter, no group-delay or phase rotation
- Separate amplifiers for bass, Hypex class D
- Implemented in the Minidsp 2x4HD

I have already prototyped an impementation, and it measures good. It improves directivity up to 250 hz, and removes the typical front-wall cancellations in the 100-200 hz range.

Last edited by alfegutt; 14th March 2021 at 08:07 PM.
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Old 16th March 2021, 02:08 AM   #10
norman bates is offline norman bates  United States
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11opas,

What are the dimensions of the ported box you have there (post #1), especially the port ?

Fern & Roby Raven ported is...………………...
"Overall dimensions (assembled):

The Ravens are 19.25 wide and 30.5" at their tallest off the floor. The base is about 6.25" tall at the front with an 8 degree pitch to angle the speakers into the correct listening position.

Enclosure Dimensions:

19.25" wide x 24.5" tall x 11.5" deep

When the Ravens ship to our clientele, the base is unbolted and packaged separately to protect them in transit.

Weight: 75 pounds each"

The Ravens |
Fern & Roby
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