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Recessed Audio Stage Floor Box Recommendations

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Recessed Audio Stage Floor Box Recommendations

Postby RMCL » Thu Sep 03, 2020 5:29 pm

Any recommendations with regards recessed audio stage floor boxes with lids, that come either pre-fitted or can be fitted with XLR male and female sockets, 13A sockets (UK) and possibly also with an ethernet RJ45 socket. Would need to be deep enough so that straight XLR connectors could be used with cables exiting the floor box via cable outlets on lid.
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Re: Recessed Audio Stage Floor Box Recommendations

Postby Hugh Robjohns » Thu Sep 03, 2020 5:45 pm

https://www.canford.co.uk/CANFORD-FLOOR-BOXES

Image

Canford wrote:Heavy duty steel floorbox for recessed mounting into solid and wood floors.

The top half of the box has an upper lip, which rests on or flush with the floor surface. It is finished in grey stove-enamel with grey moulded plastic lip. The bottom section has adjustable flanges for bottom fixing below the floor surface (removable if not required) plus 20mm knockouts, and is divided into three compartments.

The lid is hinged along the long edge, and is in itself a shallow tray – designed to allow a piece of carpet or wood trim (approx 5mm thick) to be inserted so as to match the lid to the remainder of the floor. Two moulded flaps are incorporated in the edge opposite to the hinge, which can either be locked shut when the box is not in use, or open to allow cables to enter. In this position they are locked so cannot partly close and trap the cables. Usable aperture with lid fully closed 12mm x 43mm per flap.

Internally, a sub-frame allows the mounting of three connector or blank plates, as required. The plates lie parallel to the floor. Various pre-punched plate options are available to suit most common requirements. The basic box includes all hardware, and is supplied without any connector plates, which are ordered separately.

Similar dip plates are available from other professional suppliers...
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Re: Recessed Audio Stage Floor Box Recommendations

Postby MarkPAman » Fri Sep 04, 2020 11:04 am

That one looks suspiciously like what a local church (which host occasional gigs) has installed.
If so it's annoyingly not quite deep enough to close with standard XLRs plugged in. 13A & RJ45 are fine, but I now have to own a box of right angled XLR adapters if I want to use their multicore :thumbdown:

Do be sure to double check the depth with Canford before ordering.
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Re: Recessed Audio Stage Floor Box Recommendations

Postby blinddrew » Fri Sep 04, 2020 2:47 pm

Can you buy 45 degree angled sockets? Seems that would a) reduce the overall height requirement, and b) mean less bend on the cabled to reach the exit points.
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Re: Recessed Audio Stage Floor Box Recommendations

Postby Hugh Robjohns » Fri Sep 04, 2020 2:51 pm

Canford make angled mounting plates for D-type sockets, exactly as you suggest, but you only get two per plate module.

Other companies make deeper floor boxes, and Bryant Unlimited will make custom ones -- as I'm sure others will too.

The Canford one appears to be of a depth designed to suit most typical floor constructions...
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Re: Recessed Audio Stage Floor Box Recommendations

Postby AlecSp » Fri Sep 04, 2020 6:58 pm

Having had experience of these in our install last year, if you go out to a regular electrical suppliers, the TFB3-120 comes in *much* cheaper than those Canford prices. You can get shallower boxes, but you need the 120, which is the deepest, if you want XLRs & Speakons in there.

The next gotcha is that, despite appearances, you can't just attach 3 double-gang plates/mains sockets in there, as the plate size per compartment is larger than a regular sized 2 gang plate.

So, if you wanted a 2 gang mains socket, you either buy their custom 2 gang mains socket, or you buy a STO287 (standard twin accessory plate) which gives you a standard 2 gang space.

However, if you want to fit a standard 2 gang plate with D holes (for XLR/Speakon) to the box and have the lid closeable with the connectors in, you'll need to get the STO287/FM (standard twin accessory plate, stepped down 10mm) to give you the extra height. Canford's 8 universal socket plate does this in a single part.

Be aware, though, that you'll still end up with quite a sharp bend on the cables, with the lid closed. You also have to train people to use the cable access flaps properly, or you'll find cables crushed. There's limited space under the plates for terminations, watch that you don't get shorts on the base of the box - I think our installers cut holes in the base to deal with this.

The end result achieves an end, but isn't perfect, and needs careful use.

Hope all that obsessive detail helps.
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Re: Recessed Audio Stage Floor Box Recommendations

Postby Hugh Robjohns » Fri Sep 04, 2020 7:11 pm

AlecSp wrote:...if you go out to a regular electrical suppliers, the TFB3-120 comes in *much* cheaper than those Canford prices.

Pretty much anywhere else comes in cheaper than Canford's prices for everything! :lol: Canford can be very convenient, they carry lines that aren't readily available anywhere else, and their tech support is very good. but cheap they ain't!
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Re: Recessed Audio Stage Floor Box Recommendations

Postby RMCL » Sun Sep 06, 2020 11:28 pm

The Canford floor boxes they have angled socket plates can take up to 4 XLR panel mount connectors (2 at each end which are staggered between the 2 ends) see https://www.canford.co.uk/Products/49-688_CANFORD-FLOOR-BOX-Angled-four-universal-socket-plate (can only be put in the centre of the floor box).

They also do an angled socket plate that can take 2 XLR panel mount connectors at one end see https://www.canford.co.uk/Products/49-686_CANFORD-FLOOR-BOX-Angled-two-universal-socket-plate-end-positions which go in the sides of the floor box.

It looks as if both of these have been designed to take straight XLR connectors. However, in the case of the angled socket plates that can take up to 4 XLR panel mount connectors I am not sure how sensible it is to have 2 of the cables having to be flexed through 180 degrees to get to the floor box lid exit point.
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Re: Recessed Audio Stage Floor Box Recommendations

Postby AlecSp » Mon Sep 07, 2020 12:12 pm

One other option is to put the sockets in the long vertical edge of the floorbox, i.e., the top section, which I remember doing on an old install. You'll need a D punch to make the holes, though.

A bit of a fiddle to insert & remove plugs but, if you put the sockets in the hinge side, makes for an easy cable flow through the exit points.

There's still a need for a deeper still version of this box for audio use, but I'm not sure if the 120mm depth hits some building standard such that anything deeper would have limited use.
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