Zaph ZA5.2 vs. SEAS L15-27TBFC/G - diyAudio
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Old 2nd January 2010, 04:15 PM   #1
pmt is offline pmt  United States
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Default Zaph ZA5.2 vs. SEAS L15-27TBFC/G

As most probably know, the Zaph ZA5 family of speaker designs use ZA14W08 mid/woofers and Vifa DQ25SC05-04 tweeters. I recently put together a pair of the ZA5.2 (small sealed box) and listened to them compared to my best DIY effort to date, that uses the SEAS drivers. My SEAS satellites are also small sealed boxes and use crossovers based on previous Zaph work. In both cases, the satellites are actively crossed over to 12" woofers at 200 Hz.
After much listening, I was surprised to find that the $13 Vifa tweeter sounded very similar to the SEAS 27TBFC/G. They don't sound identical, but to my ears their performance is quite close. I probably slightly prefer the SEAS, but others might choose the Vifa.
The ZA14W08 is a better midrange than the L15, which is perhaps not too unexpected. I've always liked the sound of the L15 - best of the numerous 5" and 6" drivers I've accumulated over the years. But the ZA14W08 is noticeably more accurate and natural sounding in the midrange frequencies than the L15.
I haven't heard and can't afford the SEAS W15, which many have said is a better sounding 5" than the L15. But for $40 each the ZA14W08 sounds good enough to my ears to satisfy me.

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Old 2nd January 2010, 04:33 PM   #2
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The ZA14 is a good midwoofer. I have mine with a Vifa XT25SC90.

What crossover are you using with your Vifa DQ25SC05?
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Old 2nd January 2010, 07:00 PM   #3
pmt is offline pmt  United States
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Default crossover on Vifa

I used the crossover as designed by Zaph for his ZA5.2 speaker, for both the ZA14W08 and the Vifa DQ tweeter. For the tweeter it is a simple 2nd order (electrical) high pass filter - 8.2 microfarad cap and 0.35 mH coil. Also, an L-pad matches the Vifa's output with the ZA14W08's much lower sensitivity - especially with Zaph's baffle step compensation in the low pass crossover used on the ZA14W08.
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Old 2nd January 2010, 08:57 PM   #4
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As long as its above 3K, the smaller tweeters like the Vifa DQ25SC05 are fine. I had to cross my XT25 at 3K5 at 18dB. Lower than that, it sounds distressed.

The larger tweeters (SEAS 27TBFC/G) are good for a lower crosspoint. Usually specified at 2K5 at 12dB. They are often paired with larger woofers (6-1/2") because the bigger the woofer, the earlier the roll off.

If you cross your SEAS 27TBFC/G at 2K5, you will hear the difference. But it's a bit of an overkill with the ZA14.
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Old 4th November 2013, 07:59 PM   #5
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"Vifa tweeter sounded very similar to the SEAS 27TBFC/G"
it is not true
Vifa DQ25SC05-04 does not have hole in core and low end is very colored and unpleasant
SEAS 27TBFC/G does not have any problem in low end
upper 4 hz vifa is ok
then
ZA14W08 has very high Fs (65hz) and very low MMs (7gr), and you have downfall since 200hz, and you will not be able get good responce even with sub
i have pair ZA5, i do not listen them because forwarding midrange, colored 1.5-3 KHz range
and Zaphs graphs has very high scale, you see flat responce, realy it is far not so flat
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Old 4th November 2013, 09:31 PM   #6
tvrgeek is offline tvrgeek  United States
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I too never quite came to terms with the Zaph driver. I have done better with the small Dayton RS. 100, 125, 150 series.

100% agreement with MC on the crossover of the XT25 and the Seas. I find the Seas quite workable at 2.6K second order electrical.
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