I suspect the cost of you producing a custom lid will probably have premium over CQR producing a custom lid.
However the concept of the multi box is a good idea but I don't see that many, the largest user & only one I can think that has a custom lid is secom ?
Back in the late 80's / early 90's....
Everybody & their dog would have used a 9800 in a commercial job, ADT or Shorrock, regional co's, independent co's, electrical contractors or private jobs
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it would appear v5 upwards software supports premier lcd keypads, v6 makes your controls around 17yrs old
there is no support for prox tokens on any software version of this product
I think we'd about finished with them when I started
I recall the sticker s being reprinted to suit the size of cequra with a tel. No with a few digits less than today
no its a "scancom" digi unsure of model but dated 1984 ?
the trick with bell modules was to leave them in the plastic bag & it stopped most of the rusting
IIRC we started buying CQR Cequra's early 1990's, the 1st batch lasted forever....
I can't recall the last anti foam device I removed,
I have an old bell module that came down earlier in the yr , I'll pop a pic sometime
their was a foam pedant (cqr ?) which had magnet to keep in vertical, foam or a 1/2 a brick being chucked a the bell would knock it in to alarm
there has been all sorts of clever stuff, however the industry is very "price sensitive"
IIRC "Viper foam detector"
pcb within plastic case, size of shock sensor
IR Led + Receiver below the case
Used to FA when the housing filled with webs or bugs ect...
Used to FA when it got dark after it had be powered up the 1st time
Google has no pics & I've not see one in yrs....
I was toying with moving over to these-
These are the small speaker the large speaker ones haven't turned up yet
In the flesh they not any smaller in profile than normal speaker
https://www.knightfireandsecurity.com/product/grade-3-internal-sounder-octone/
However starting small with something like the above would still be a significant project...
@gabs an extension speaker in its basic form is just a speaker in a box
You need to have mould made & could use a 3rd party to produce a run of plastics
Speakers would be bought in, production would be putting leads on ect... assembly & packing
As a hobby you'd probably cover your costs... As a business you'd probably loose money