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Multi-Way Conventional loudspeakers with crossovers

SEAS MR18 3-way
SEAS MR18 3-way
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Old 9th November 2018, 07:31 AM   #11
Juhazi is offline Juhazi  Finland
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Quote:
Originally Posted by jtgofish View Post
I would not waste my time on those woofers.They might be fine as subs but not much good above about 70hz.Moving mass is too high and BL [force factor] is too low for such a heavy cone/surround.They have very poor timing and sound soggy above that frequency range.
I have tried all sorts of loadings and boxes but the fundamental character never changed.I sold mine.
I got them cheap, second hand. We will see, xo will be around 2-300Hz LR2. Actually I am more concerned about the low end of MR18, must be careful with distortion.
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Old 9th November 2018, 07:35 AM   #12
Juhazi is offline Juhazi  Finland
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iperno,
You can use Loki xo as starting point. SEAS have used many different tweeters in their coaxials, and it can be changed easily. I have T18REX coaxials with aluminium tweeters workin as my home theater L/C/R. Xo is not Loki, but Finnish kit design AW-7
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Old 13th November 2018, 06:18 PM   #13
iperno is offline iperno  Italy
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Grazie, bel kit, lavora in pochi litri rispetto al loki.
La mia domanda è: i t17rex che posseggo hanno il woofer a 4 ohm, invece che 8 ohm come trovo su tutti i progetti, quali modifiche devo apportare ai crossover?
Devo cambiare i valori di condensatore e induttanza della parte passa basso per mantenere il taglio ai valori previsti?
Grazie.

Last edited by iperno; 13th November 2018 at 06:21 PM. Reason: mistake
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Old 13th November 2018, 06:19 PM   #14
iperno is offline iperno  Italy
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Thanks, nice kit, works in a few liters compared to the loki.
My question is: the t17rex I have have the 4 ohm woofer, instead of 8 ohms as I find on all the projects, what changes do I have to make to the crossovers?
Should I change the capacitor and inductance values of the low pass part to keep the cut at the expected values?
Thank you.
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Old 13th November 2018, 06:42 PM   #15
Juhazi is offline Juhazi  Finland
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^Sorry, I don't know how to design passive crossovers! But yes, values must be different!

Perhaps someone else at this forum can help iperno?
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Old 13th November 2018, 06:58 PM   #16
denbret is online now denbret  Canada
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Hi, I made several measurements and tests with the SB29NRX75-6 woofer.

The ideal xover cut is around 200hz in 12db.

At the top of 175hz, its energy decreases a lot. But at this frequency, the SB29 is excellent. Volume of 55 liters.
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