Hornby Class 43 HST DCC & TTS Sound Speaker Upgrade or Replacement (R3602TTS)

Hornby have just released a brand new Class 43/HST set with TTS sound. It’s a fantastic model and the sound decoder is pretty decent too for the money, but, as is the case with most sound decoders, the factory-fitted speaker is a little tinny and doesn’t have much bass response to it.

In this in-depth video, I show you all you need to know about upgrading/replacing stock TTS & DCC sound speakers with a far superior Mega Bass speaker, including rewiring, body preparation (for anyone who doesn’t have a sound-fitted model) and installation. The improvement to sound and bass response from these new speakers is fantastic.

The HST set featured in the video is not a TTS-fitted model, however the steps involved in replacing the speaker are exactly the same for a TTS chip as they are a LokSound or Zimo decoder.

We look at both TTS and LokSound V4 decoders; the only difference being that a TTS (and Zimo) decoders must use an 8 ohm speaker, while the LokSound V4 can use anything between 4 and 16 ohms.

Speaker impedance and decoder specifications are explained in more detail in our free guide, which you can download here:

Looking to buy replacement speakers?

There are a variety of different retailers selling Mega Bass speakers (also called ‘High Bass’). Here are some options:

* Megabass speakers on AliExpress

Megabass speakers on eBay

* Highbass speakers from Coasal DCC

 

Please note: If you choose to follow any of the steps or suggestions outlined in the video, you do so at your own risk and any damage or injury to yourself, your models, your equipment or others is your own responsibility.

Wiring Diagram for DCC Decoder Test Board & Rolling Road

This is a wiring diagram for the decoder/loco test boar and rolling road featured on this website. Your own test board wiring requirements will vary depending on the components that you use and also the specifics of your design. The diagram provided above is only a guide and you must work out your own wiring needs yourself to avoid costly damage to programmers, testers and decoders.

Making a Test Board & Rolling Road for Analogue & DCC Model Locos

I’ve been doing an increasing number of DCC decoder installations and model locomotive repair jobs – both for myself and others – and setting up my tester and rolling road each and every time I needed them was becoming a bit tiresome (not to mention the rat’s nest of cables).

After pulling what’s left of my hair out for the final time, I decided to put together a small loco and decoder test board, incorporating my LokProgrammer and SPROG, as well as accommodating off-board control integration (DCC and DC/Analogue).

The board also features a rolling road, using DCC Concepts rolling road modules, and my own take on a means to permanently integrate them into a test set up and improve usability, using acrylic sheet, spacers and screws.

You can download a PDF version of the wiring diagram for the test board featured in the video via the link below:

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Wiring Diagram for DCC Decoder Test Board & Rolling Road 5.98 MB 463 downloads

This is a wiring diagram for the decoder/loco test boar and rolling road featured...

This is only one way of approaching a decoder test board setup and there other examples out there. I do recommend that you consider something like this if you’re intending to do a lot of decoder installation and maintenance – it saves a lot of time and hassle!

CORRECTION: in the video, I mention the acrylic/perspex sheet as being 6mm when it is actually 4mm. A thickness of 6mm is likely to be too thick and may interfere with the wheel flanges.

Project Components

You can buy some components for this how-to project via the links below. Buying via Amazon affiliate links means I get a (very) small donation and helps to support the website and channel:

– DCC Concepts rolling road: https://amzn.to/2C1IB6t
– Red and black wire pack: https://amzn.to/2C1Infx
– Green 2-pin terminal plugs/sockets: https://amzn.to/2PiVfiW
– Peco straight track: https://amzn.to/2LGgPM7
– A4 clear acrylic sheet (4mm thick): https://amzn.to/2Cae1Yk
– M5x8mm black nylon spacer: https://amzn.to/2Pq7tX4
– A4 plywood 12mm: https://ebay.us/LGRLYW
– A4 plywood 3mm: https://amzn.to/2C03bE2
– ESU decoder tester: https://ebay.us/aBLzSi
– SPROG dcc module: http://www.sprog-dcc.co.uk
– Green power panel-mount socket/plug: https://ebay.us/nBLfXz
– DC power-style socket: https://ebay.us/nBLfXz
– 3 position, 2-pole switch: https://ebay.us/WyKD3b

3D Printer STL Files

If you’ve got a 3D printer, you can download STL file for the 3D-designed parts for free and print yourself a copy:

Switch box/enclosure: https://skfb.ly/6B6Cy
SPROG3 cradle: https://skfb.ly/6B6DY

Please note: If you choose to follow any of the steps or suggestions outlined in the video, you do so at your own risk and any damage or injury to yourself, your models, your equipment or others is your own responsibility. Your own test board wiring requirements will vary depending on the components that you use and also the specifics of your design. The diagram provided above is only a guide and you must work out your own wiring needs yourself to avoid costly damage to programmers, testers and decoders.