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-   -   Fostex FF125K Bass problom (http://www.diyaudio.com/forums/full-range/87782-fostex-ff125k-bass-problom.html)

lscangus 6th October 2006 08:08 AM

Fostex FF125K Bass problom
 
i foudn the bass is not enough, how cna i add a crossover to it to tune it?

Angus

rabbitz 6th October 2006 11:51 AM

Add some BSC and there's a great little Excel spreadsheet plus some good articles on Martin King's site.

http://www.quarter-wave.com/General/..._Articles.html

hm 6th October 2006 05:58 PM

how you will get bass by a speaker with 0,15 mm stroke,
the ff125k use above 300 Hz that will work

chrisb 6th October 2006 06:53 PM

A quick look at the T/S & FR graphs suggests that a BLH (frugelhorn or Scottmoose's PJ Harvey-horn) /or bipole MLTL (metronome) might give you the bass lift needed without resorting to any BSC or other filtering/EQ.

It might also benefit from some judicious treatment;
1) dammar varnish or C37 of the paper cone,
2) puzzle-coat /modgepodge/ diluted PVA white glue of the metal dustcap
3) duct-seal/clay caulking rope to basket legs and gap between magnet and basket
4) if the magnet is not braced to the cabinet side walls/back, you'd probably have room for a 1/2" - 3/4" felt pad on rear of magnet, and thinner layer on basket legs to absorb any rear wall reflections

hm 6th October 2006 07:16 PM

Also a horn is not enough,
simulate everything you want, AJ horn,
latly after 0,5 Watt there is always compression,
this means more than "9 a´clock" on your amp
is the end.
Make a f.a.s.t system crossed 300 Hz

chrisb 6th October 2006 07:28 PM

Quote:

Originally posted by chrisb
A quick look at the T/S & FR graphs suggests that a BLH (frugelhorn or Scottmoose's PJ Harvey-horn) /or bipole MLTL (metronome) might give you the bass lift needed without resorting to any BSC or other filtering/EQ.

It might also benefit from some judicious treatment;
1) dammar varnish or C37 of the paper cone,
2) puzzle-coat /modgepodge/ diluted PVA white glue of the metal dustcap
3) duct-seal/clay caulking rope to basket legs and gap between magnet and basket
4) if the magnet is not braced to the cabinet side walls/back, you'd probably have room for a 1/2" - 3/4" felt pad on rear of magnet, and thinner layer on basket legs to absorb any rear wall reflections

PS:
As to hm's valid concern re the x-max question, if you're able to attain some bass lift via BLH, and amplitude requirements are modest (i.e. small room / near field) you might not have any problems. If this driver was shielded, it could make a great little computer speakers



pps: too late - it looks like hm has already answered the horn issue.

Since Fostex classifies this driver as "Full Range" and their recommended design is a 10l ported enclosure, one wonders what application it might be put to without suffering the excursion / compression limitations described above.




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