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Old 14th July 2013, 10:06 AM   #1
AndrewR is offline AndrewR  United Kingdom
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Default FF105WK floorstanders

Hi all,

IG's floorstanding FF85WK horns and youtube'd results were pretty outstanding and I am inspired to make a small pair of loudspeakers based on the FF105WK.

Height-wise about 70-75cm. I tried modelling the TQWTL, but sadly the results gave a 66cm high loudspeaker with the driver mounted too far below ear level.

I'm kind of thinking either floorstanding fonken or DBR, but don't known where to start with the design - e.g. internal volumes, port areas and lengths. Can anyone advise?

Cheers,

Andrew
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Old 14th July 2013, 10:57 AM   #2
xrk971 is offline xrk971  United States
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A TQWTL like a Metronome with good ear height should be no problem for this driver as it is a basic 4 inch class driver. A FH3 shoukd also work as it cants the driver up 5 deg with a height if around 30 inches.
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Old 14th July 2013, 11:56 AM   #3
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Here's a nice small MLTL that roughly fits the height restriction.

Internal dimensions:
28.5in x 5in x 7.75in (HxWxD).
Zd = 5.625in.
Slot vent full internal width, 1.5in tall at bottom of front baffle. 0.75in long.
Stuff box with uniform density of 0.5lbs ft^3 of Dacron hollow-fibre material & adjust to suit from there. A removable back to allow easy access would be useful -just ensure it's well sealed.

One of my favourite vented alignments -quasi pro-audio style with a little extra broadband gain to help with losses & give a bit more subjective punch to the midbass. Easy impedance load & very linear driver deflection behaviour, both moving toward TL characteristics. It's not tuned for maximum extension, but should strike a useful balance.
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Old 14th July 2013, 04:54 PM   #4
IG81 is offline IG81  Canada
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Thanks for the comments on my little FF85WK "BLH" (more of an apex-driven pipe-horn, ah the endless terminology...). It's a neat little box, but could certainly be bettered upon, though I doubt much more punch could be extracted out of this little driver without sacrificing extension or smoothness, areas I feel are already somewhat compromised.

FF105WK and FF125WK have been used in Metronomes by member AmadeusMozart, he like both of them alot.

Scotmoose's design is probably the simplest to build and should sound good IMO. BTW, I assume it's for the FF105WK?

IG
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Old 14th July 2013, 07:00 PM   #5
AndrewR is offline AndrewR  United Kingdom
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Thanks for the comments, particularly to Scott - for sharing your design (it seems like one of your Pensil designs ). Can the driver be positioned near the top?

Thanks for the reply IG81, I'm having to build a pair of low-intensity loudspeakers so that the neighbours don't 'enjoy' my music and I can play more often. BTW, I am also in the process of trying out a tricked-out version of the Velleman K4003. Using upgraded components, an acrylic chassis and home-made heat sink (one rectangular section aluminium inside another). I'll be replacing the psu bypass cap with a PIO bypass cap underneath the board.

I'll be back with updates.

Andrew
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Old 14th July 2013, 07:21 PM   #6
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Quote:
Originally Posted by AndrewR View Post
(it seems like one of your Pensil designs ).
Pensils have Mark Audio drivers, these called L'Stylo (thanx Chris)

dave
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Old 14th July 2013, 08:03 PM   #7
doorman is online now doorman  Canada
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So much nomenclature, so little time---!
don
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Old 14th July 2013, 10:48 PM   #8
IG81 is offline IG81  Canada
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Quote:
Originally Posted by AndrewR View Post

Thanks for the reply IG81, I'm having to build a pair of low-intensity loudspeakers so that the neighbours don't 'enjoy' my music and I can play more often. BTW, I am also in the process of trying out a tricked-out version of the Velleman K4003. Using upgraded components, an acrylic chassis and home-made heat sink (one rectangular section aluminium inside another). I'll be replacing the psu bypass cap with a PIO bypass cap underneath the board.

It's too bad the K4003 has fixed gain, would have liked to have external resistors to play around. I just find 30db a bit high for the power output, but it's not too bad still. Actually, it might be possible to add a resistor to pin 8, but that'd turn the whole thing into two mono channels the larger the R used, but gain would go down. Can we bridge this amp and use two in this fashion for stereo?

IG
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Old 14th July 2013, 10:51 PM   #9
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No problem.

The driver is already fairly near the top; it can't be shifted any further up though without impacting on the performance.

Yes, it's akin to the pensils, but not the same as. The alignments are different, although the generalised type is similar.
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Old 14th July 2013, 10:58 PM   #10
AndrewR is offline AndrewR  United Kingdom
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I'll be using a logarithmic pot on the input, so that should help - but 30dB does seem like massive gain.

Andrew
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