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 Posted: Mon Apr 29th, 2019 04:42 am
11th Post

Joined: Sun Sep 21st, 2008
Location: Germany
Posts: 487
I could improve now the under layout low-frequency response with a modified arrangement. 

Sounds fine now. The  low-pass filter now works down to its lowest frequency of 22Hz. 

See my last post in the “The Replicant” thread.

I also tried an active subwoofer instead of the low-pass filter.
For my ears I can achieve a better result for the loco sound when I’m able to regulate the frequency,
down to a lower bandwidth than the subwoofer electronic is able to.

But the active subwoofer / satellites combination is great for an ambience Harbour sound,
I recently got from Fantasonics.


modelling in 1:22.5 on 32mm and 16.5mm track
Actual project: 7/8" scale on 45 mm track
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 Posted: Sun May 5th, 2019 03:12 pm
12th Post

Joined: Thu Feb 23rd, 2012
Location: London
Posts: 5526
" For my ears I can achieve a better result for the loco sound when I’m able to regulate the frequency "

Hi Juergen  :wave:

Yes, this was exactly the idea, when recommending the low-pass-filter board.  L:

I'm pleased to hear it is all moving in the right direction Juergen.  :thumb:

WAY CHEAPER than trying to make or buy 'super low frequency' passive crossovers as well.

I speced out a passive crossover with a center-frequency of 125 Hz a while back.  :brill:

The cost of a decent quality 'hi-fi' inductor, for the otherwise simple circuit ...

... was enormous !  $$$ 

(as was the iron-cored heavy-gauge copper-wire inductor !)  :shocked:

It was in this case though, the only 'rea'l way to go, rather than 'active' electronics.

At only a couple of Bucks, the low-pass-filter board is worth getting to experiment with.

I got one here, which I briefly tinkered with, currently residing in my  C :cool: :cool: L  boards box !  ;)

Had any ideas Stan ?  ???

Maybe you got an old BOSS-pedal kicking around that might work for something.  ;) ;) ;)

Perhaps some chorus & overdrive could sound good from a Porter !!  :Crazy:




' Mysterious Moose Mountain ' - 1:35n2 - pt.II

' M:R:W Motor Speedway !!! ' - 1:32 Slotcar Racing Layout
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