Help CrossOver for FR125s + G2si Tweeter - diyAudio
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Old 17th April 2016, 11:18 PM   #1
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Default Help CrossOver for FR125s + G2si Tweeter

I will re-build my speakers, i was using a single FR125s and now i want to use two FR125s (want more SPL) + G2Si Tweeter-

Will use a sealed box with 25L (or bigger if some recommend me that will be too small) and will add the tweeter. Can someone please recommend me some crossover design? i think that will cut the tweeter high than the 2.5khz (as manufacturer recommends) (close to 3,5khz will be ok?) can someone please help me with the Xover design?

Sens of G2Si are 96db and 6ohms
Send of FR125S are 86db and 7ohms (will get close to 4ohms because will use two)

Second Order Bessel XOver show me something like in a website

(4.3uf / 0.47mH) for the tweeter and (6.5uf / 0.31) for the woofer

its ok?

I need something that reduce the sensibility of the tweeter, right?


Click the image to open in full size.

is possible to get some troubles with sound if just get 100mm depth? i want to get as flat as possible the cabinet, because want to put it close to the wall and dont have enough space

*Sorry for my english


Thanks in advance.

Last edited by samsagaz; 17th April 2016 at 11:48 PM.
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Old 18th April 2016, 02:38 AM   #2
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The FR125s should not be side-by-side, arrange them vertically. I'd arrange them with the FRs vertically as close as possible and mirror imaged tweeters off to the side to minimize the centre-to-centre.

I might have a RAW acoustics XO for this combo, but i'd have to get permission from Al to post it. Bob @ CSS can probably give you an XO, he ceratinly had an MTM but it may have been with the 16Ω WR125.

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Old 18th April 2016, 04:36 AM   #3
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wll try to contact he thanks (again)
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Old 20th April 2016, 09:23 PM   #4
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dont get any answer from Bob yet, you know the emaill or at least the user on this forum of AI? maybe can ask he
i really want to make my speakers now, im listening just with my headphones because dissasembled the speakers and amps to upgrade it
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Old 21st April 2016, 02:25 AM   #5
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Try here on his sub forum: CSS - diyAudio

He may be away till Monday.

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Old 20th June 2016, 10:42 AM   #6
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Dear Dave have one more FR125? i have 5 and need one more to make center MTM with 125FRs :/ wich is the price of these drivers?
Some driver to recommend me to add some low frequencies and make an 3 way fronts?
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Old 20th June 2016, 06:31 PM   #7
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I don't think i have FR125 but i will check if i have an orphan single. I do have WR125

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Old 20th June 2016, 07:42 PM   #8
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How much the WR125s? can i put in the same box as the FR125?

i really like the FR125s, but as i say before i need more SPL now, want to listean a little louder.
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Old 20th June 2016, 08:13 PM   #9
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email me.

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Old 20th June 2016, 09:12 PM   #10
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Email Sent
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