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Fostex FE108Sigma - Break in time
Fostex FE108Sigma - Break in time
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Old 19th September 2019, 04:48 AM   #1
perkri is offline perkri  Canada
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Default Fostex FE108Sigma - Break in time

Hi,

Just received the drivers for a backloaded horn I've been working on longer than I care to remember.

I've hooked the drivers on their own to my desktop amp.

How long should the break in take? And what changes sonically can I expect to hear?

Thanks!

Per
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Old 19th September 2019, 05:15 AM   #2
planet10 is online now planet10  Canada
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Fostex FE108Sigma - Break in time
At leas a 100 Hrs. You will get more bass and greater refinement as the break-in

What horn ar eyou building?

dave
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Old 19th September 2019, 05:37 AM   #3
perkri is offline perkri  Canada
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Thanks for the input!

I've already built the enclosures - they are the ones Fostex suggests on their site. But, I can't finish them until the speakers are broken in so I can tune the enclosures properly. Once its sealed up, there aint no changing it afterwards

It's kinda crazy that when the "box" is finished, its going to weigh close to 100lbs - this with a 4" driver...

It's my first build and am very excited to get the drivers into them and see what the fruits of my labor are.

P
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Old 19th September 2019, 07:12 AM   #4
planet10 is online now planet10  Canada
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Fostex FE108Sigma - Break in time
Quote:
...Fostex suggests on their site...
:^(

Not a great enclosure.

dave
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Old 19th September 2019, 07:39 AM   #5
DrBoar is offline DrBoar  Sweden
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I had this setup for beaking in my tangband 4" drivers
iPhone 3GS with a signal generator app, 3.5mm to RCA cable to amp and then Tangbands. I runned them over a couple of days. To get a good streach of the suspension I had the amplitude as high as I dared and to get as many streaches as possible I did not use a very low frequency like 15 Hz or so. Originally the Fr was in the 90 Hz range so I set the frequency of the generator to as I reacall 20-30 Hz below Fr.

I used sinus waves to just flex the suspension with the cone in pure pistonic movement but if cone flexion is required a triangle or square wave would flex both cone and suspension.
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Old 19th September 2019, 08:32 AM   #6
planet10 is online now planet10  Canada
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Fostex FE108Sigma - Break in time
Too do it the best way the spider in particular has to be broken in slowly and with a varying signal.

High ampltude excitation might work fine with a subwoofer but it will leave a memory on a FR suspension.

dave
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Old 19th September 2019, 08:33 AM   #7
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Fostex FE108Sigma - Break in time
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Originally Posted by planet10 View Post
:^(

Not a great enclosure.

dave
Oops, sorry, i was thinking of the FE126 cabinet. The FE108e∑ enclosure is OK.

dave
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Old 19th September 2019, 01:53 PM   #8
perkri is offline perkri  Canada
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Thanks. So, not a good idea to leave radio on (CBC) 24/7 sending mostly voices into it? I could also just have my music library on random repeat? Everything from Gregorian Chant, Bill Evans to Mr. Bungle (and everything in between...

This is the enclosure I built.

https://www.fostexinternational.com/...108ez_encl.pdf
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Old 19th September 2019, 04:08 PM   #9
DrBoar is offline DrBoar  Sweden
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Rammstein on repeat then ��
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Old 19th September 2019, 05:07 PM   #10
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Fostex FE108Sigma - Break in time
Quote:
Originally Posted by perkri View Post
Thanks. So, not a good idea to leave radio on (CBC) 24/7 sending mostly voices into it?
CBC here plays music too. with just a dipole downstairs i really only get 1 channel.

Quote:
I could also just have my music library on random repeat?
That would work. If you go change the volume regularly then it is like the “regular” use that gives a well rounded break-in.

This is the enclosure I built.

https://www.fostexinternational.com/...108ez_encl.pdf[/QUOTE]

A Montreal manufacturer made a commercial version of that enclosure that was made of MDF and was swooped up. It rather turned me off, and i stronglt suspect that it did not perform as well a proper plywood builtd with the sharp corners (which act as the needed low padd filter for the horn output.

IIRC, part of the push that got the Frugel-Horns done.

dave
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