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-   -   Fostex FE108Sigma - Break in time (https://www.diyaudio.com/forums/full-range/342878-fostex-fe108sigma-break-time.html)

perkri 19th September 2019 04:48 AM

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

planet10 19th September 2019 05:15 AM

At leas a 100 Hrs. You will get more bass and greater refinement as the break-in

What horn ar eyou building?

dave

perkri 19th September 2019 05:37 AM

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

planet10 19th September 2019 07:12 AM

Quote:

...Fostex suggests on their site...
:^(

Not a great enclosure.

dave

DrBoar 19th September 2019 07:39 AM

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.

planet10 19th September 2019 08:32 AM

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

planet10 19th September 2019 08:33 AM

Quote:

Originally Posted by planet10 (https://www.diyaudio.com/forums/full-range/342878-fostex-fe108sigma-break-time-post5918954.html#post5918954)
:^(

Not a great enclosure.

dave

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

dave

perkri 19th September 2019 01:53 PM

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

DrBoar 19th September 2019 04:08 PM

Rammstein on repeat then ��

planet10 19th September 2019 05:07 PM

Quote:

Originally Posted by perkri (https://www.diyaudio.com/forums/full-range/342878-fostex-fe108sigma-break-time-post5919218.html#post5919218)
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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