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Multi-Way Conventional loudspeakers with crossovers

Seas DXT vs Seas 27TBFC/G + WG300
Seas DXT vs Seas 27TBFC/G + WG300
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Old 16th May 2020, 07:47 AM   #1
digitalthor is offline digitalthor  Denmark
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Default Seas DXT vs Seas 27TBFC/G + WG300

Hi everyone


I've been very interested in waveguide lately. But cant really seem to find my ground.
Since I have a small midrange and an existing 4 way design. I want to build something like it, but with a little different design and more constant directivity. So I found the Seas DXT that is so popular in Kii3 and Grimm Audio, which I also like to listen to, when I visited different exhibitions.
The DXT might be a little to small.... maybe. But I do have a 5" hard cone midrange for the project.
Then I saw on sound imports, that they have guide for waveguides - haha
SoundImports | "Wave guiding" your favorite tweeter. - SoundImports
What if I use the Seas Prestige 27TBFC/G with the Monacor WG300..... would that make a wannabe Seas DXT, but larger?
I can see on Heissmann acoustics, that the DXT can peform well. But since the price is very close - then I could not help to think that this combo might work really well.
Anyone seen someone do this?


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Old 16th May 2020, 08:33 AM   #2
Zvu is offline Zvu  Serbia
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With waveguide that large you have much better directivity control and boost under 10kHz so you can lower the crossover point substantially.

Since DXT doesn't have a ferrofluid in the gap (and not without a reason), i'd suggest Seas 27TBC/G instead of 27TBFC/G.
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Old 16th May 2020, 02:51 PM   #3
digitalthor is offline digitalthor  Denmark
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Thank you. But do you mean that it's actually not needed to use a waveguide that large, to cross with a 5" . Since the DXT can be easily be crossed at 1800hz??:
DXT-MON | 5 ″ 1 ″ | Near field monitor | Compact speaker
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Old 16th May 2020, 03:16 PM   #4
Zvu is offline Zvu  Serbia
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I'm using WG148R to cross to Seas L15 at 1650Hz. You definitelly do not need a waveguide that large if you're using a 5" midwoofer.

I wouldn't say DXT is easilly crossed at 1800Hz. I'd say that is tje lowest crossover point with that tweeter and demands steep filter to protect it from getting damaged.
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Last edited by Zvu; 16th May 2020 at 03:19 PM.
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Old 16th May 2020, 03:17 PM   #5
digitalthor is offline digitalthor  Denmark
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Quote:
Originally Posted by Zvu View Post
I'm using WG148R to cross to Seas L15 at 1650Hz. You definitelly do not need a waveguide that large if you're using a 5" midwoofer.
Which tweeter.... cause I really like hard domes
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Old 16th May 2020, 03:26 PM   #6
Zvu is offline Zvu  Serbia
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Ring radiator at the moment, but i have used Morels and Seas (soft dome) in past - i posted measurements of those. I tried to fit Seas 27TBC/G but eventually failed. Very tricky front plate with mesh that leaves quite a gap when removed.
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Old 16th May 2020, 05:19 PM   #7
digitalthor is offline digitalthor  Denmark
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The L15 looks like it runs cleanly to 2Khz
H1141-08 L15RLY/P
So the DXT should cross fine with LR4??
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Old 16th May 2020, 05:45 PM   #8
giralfino is offline giralfino  Italy
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The L15 has a very strong breakup at 8KHz. Without seeing any distortion plot, I'm a bit worried of a 1.6KHz high 5th harmonic breakup induced distortion, so maybe this is a good crossover point.
You probably don't need the WG300 with a 5" driver, and the WG148 should suffice. The latter can be mounted easily to tweeters with a flat faceplate, but the 27TBFC/G doesn't seem to fit because of the grille, you could have more luck with the soft dome equivalent TDFC.

Ralf
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Old 16th May 2020, 07:16 PM   #9
digitalthor is offline digitalthor  Denmark
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Quote:
Originally Posted by giralfino View Post
The L15 has a very strong breakup at 8KHz. Without seeing any distortion plot, I'm a bit worried of a 1.6KHz high 5th harmonic breakup induced distortion, so maybe this is a good crossover point.
You probably don't need the WG300 with a 5" driver, and the WG148 should suffice. The latter can be mounted easily to tweeters with a flat faceplate, but the 27TBFC/G doesn't seem to fit because of the grille, you could have more luck with the soft dome equivalent TDFC.

Ralf
Thank you.
I have a fully active system, so with a DSP I should be able to tame the breakup - 6Khz lower than the cross-over-point??
Leaning more and more towards the DXT
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Old 16th May 2020, 10:30 PM   #10
giralfino is offline giralfino  Italy
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Most breakup induce odd (n) order distortion at 1/n of the breakup frequency. So for the 8KHz breakup I expect a 3rd harmonic distortion peak at 8000/3 Hz and a 5th harmonic peak at 8000/5 = 1600 Hz.

Ralf
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