SEAS FA22RCZ vs. Fostex FE206En - Page 3

saschagabor · 8th April 2011, 05:00 PM

Quote:

Originally Posted by planet10

Got mine today. 1st impression: packaging is unimpressive. Some of these are probably going to get damaged inside the packing box.

I believe that every SEAS Prestige driver I´ve bought have been delivered in the same kind of packaging that the FA22RCZ arrived in. Not great, but does the job. That´s if there is no loose objects in the same box, that could be hazardous.

saschagabor · 8th April 2011, 05:09 PM

Quote:

Originally Posted by simplymortified

Has anyone built an Aperiodic box? I am think of modding the sealed boxes with some home made 'variovents'.

I´ve built the recommended enclosure for the SEAS Exotic (as I´ve also have this driver), but the volume is the same 60 liter. I´m thinking about building some new and wider cabinets. I´ll probably also make it aperiodic, so any input on this will be much appreciated.

Joachim Gerhard · 8th April 2011, 05:37 PM

I bough 10.000 nth of SEAS drivers over the last 30 years and rarely had a broken one, so yes, the packaging is average but adaquate. I have shown a way to tame the treble by coating the wizzer and also did a rather big transmission line - reflex cabinet that works the bass quite well. The parameters allow it. a closed box may be simple but does not bring the best out in this rather low Qts, high Vas driver.

chrisb · 8th April 2011, 06:01 PM

Quote:

Originally Posted by Joachim Gerhard

I bough 10.000 nth of SEAS drivers over the last 30 years and rarely had a broken one, so yes, the packaging is average but adaquate.

Over here the major carriers ( FEDEX/UPS/USPS/ etc) seem to have an ongoing contest to ignore shipping labels and continually refine ingenious methods and extents to which visible and concealed damage can be incurred to even very well packed goods.

The collective creativity is consistently amazing.

Quote:

I have shown a way to tame the treble by coating the wizzer and also did a rather big transmission line - reflex cabinet that works the bass quite well. The parameters allow it. a closed box may be simple but does not bring the best out in this rather low Qts, high Vas driver.

What approx volume / tuning / damping scheme did you find most effective?

Joachim Gerhard · 8th April 2011, 06:13 PM

The box is 40.5 cm wide, 29 cm deep and 120 cm high. Some 100 liters internal volume with aprox. 20mm strong sidewalls from chipboard and 20mm spruce front and back baffle. Internally are some stiffening and difusing boards that are not critical. The reflex tube is 10cm diameter and max. 28cm long, the end cut 45° to split the tramission resonance somewhat. The tube shows to the top that i found out is not optimal. I will move the tube to near the floor. The wizzer has one coat of liqiud polymer that made the treble response better from pus-minus 5dB to plus minus 2dB. I stuffed the box slightly with polyfill and use an LCR trap to get the midrange down.

Joachim Gerhard · 8th April 2011, 06:18 PM

Here is the result with and without the LCR trap. Forget the mesaurement under 200Hz.
It is a freefield response with windowing.

saschagabor · 8th April 2011, 06:42 PM

Quote:

Originally Posted by Joachim Gerhard

Here is the result with and without the LCR trap.

Are both measurements done after coating?

From an earlier post I see you posted that you used the values "8.8 Ohm, 0.77mH and 3.2uF" for the trap, still the same values?

I´m currently using 3.9 Ohm, 0,56 mH and 4.7 uF. Will your values make the trap wider?

mp9 · 8th April 2011, 06:47 PM

Which color = without LRC trap?

Joachim Gerhard · 8th April 2011, 07:34 PM

The green one is without the trap. The measurement is with coating. Without the response is very ragged and the sound is rather agressive and very dependant on angle. The trap is optimised for the baffle width and the position of the driver that i offset somewhat from the midlle aproximately at 3 to 5 or use the golden cut. My trap may not work on another baffle so i can not answer that question. There is a programm called "Edge" where you can simulate how the position and dimension of the baffle affects the driver response.

superlian · 8th April 2011, 09:17 PM

Please explain how you coat the wizzer?

I use a Zobel today but best will off coarse be without

(i live only 10 min from the Seas factory and know some people there via my job, i have already discussed with them about cutting out the dustcap in order to make a phase plug)

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8th April 2011, 05:37 PM	#23
Joachim Gerhard diyAudio Member Join Date: Mar 2009	I bough 10.000 nth of SEAS drivers over the last 30 years and rarely had a broken one, so yes, the packaging is average but adaquate. I have shown a way to tame the treble by coating the wizzer and also did a rather big transmission line - reflex cabinet that works the bass quite well. The parameters allow it. a closed box may be simple but does not bring the best out in this rather low Qts, high Vas driver.

8th April 2011, 06:13 PM	#25
Joachim Gerhard diyAudio Member Join Date: Mar 2009	The box is 40.5 cm wide, 29 cm deep and 120 cm high. Some 100 liters internal volume with aprox. 20mm strong sidewalls from chipboard and 20mm spruce front and back baffle. Internally are some stiffening and difusing boards that are not critical. The reflex tube is 10cm diameter and max. 28cm long, the end cut 45° to split the tramission resonance somewhat. The tube shows to the top that i found out is not optimal. I will move the tube to near the floor. The wizzer has one coat of liqiud polymer that made the treble response better from pus-minus 5dB to plus minus 2dB. I stuffed the box slightly with polyfill and use an LCR trap to get the midrange down.

8th April 2011, 06:47 PM	#28
mp9 diyAudio Member Join Date: Jun 2006	Which color = without LRC trap?

8th April 2011, 07:34 PM	#29
Joachim Gerhard diyAudio Member Join Date: Mar 2009	The green one is without the trap. The measurement is with coating. Without the response is very ragged and the sound is rather agressive and very dependant on angle. The trap is optimised for the baffle width and the position of the driver that i offset somewhat from the midlle aproximately at 3 to 5 or use the golden cut. My trap may not work on another baffle so i can not answer that question. There is a programm called "Edge" where you can simulate how the position and dimension of the baffle affects the driver response.

8th April 2011, 09:17 PM	#30
superlian diyAudio Member Join Date: Feb 2010	Please explain how you coat the wizzer? I use a Zobel today but best will off coarse be without (i live only 10 min from the Seas factory and know some people there via my job, i have already discussed with them about cutting out the dustcap in order to make a phase plug)