That sounds like the action of your noise blanker.  Don't turn it on unless
you really need it.  

Also, on the lower bands, you might want to switch off the preamp and
perhaps activate the attenuator.  The objective is to get the background
noise with your antenna perhaps 6 to 10 dB louder than the noise level with
no antenna or a dummy load (while the RF gain is reduced so you can hear the
difference).  This gives you enough sensitivity to hear the weak ones
without creating a lot of extra distortion products in the receiver.  But
that was another reason I liked the FT950 over the FT450:  the 950 has two
preamp stages and four attenuator settings.

Hope you can fix this.  Some kind of speaker is not going to fix this, and a
different roofing filter won't make much difference, either.
73,
Lloyd Rasmussen, W3IUU, Kensington, Maryland
Home:  http://lras.home.sprynet.com
Work:  http://www.loc.gov/nls
 
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Michael Ryan
> Sent: Tuesday, June 21, 2011 8:44 AM
> To: [log in to unmask]
> Subject: Speaker Filter Systems
> 
> Hi all:=20
> 
> As my rig lacks a 3KHZ roofing filter, while in CW with the 500HZ filter =
> engaged, I still suffer from CW splatter.=20
> This splatter manifests it self as a hand over guitar strings while =
> strumming. How would be the best way to combat this?=20
> Would an external hi end DSP unit work better or an external speaker =
> such as the SP-2000 or older type of speaker/filter?=20
> 
> 73:=20
> 
> Michael De VO1RYN=20