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How to improve built in speakers

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How to improve built in speakers

Postby martinhoffen » Tue Sep 26, 2017 7:32 am

I have a Viscount Cadet, through which I play my Hauptwerk. I currently use the Cadets internal speakers and amplifiers to provide the sound. This does work reasonably well, but I feel there is an opportunity to make some improvements.

The Cadet has a 12” sub woofer (and reflex port) and a smaller full range stereo pair, driven by 3 x 70 Watt amplifiers. The speakers are all mounted in the consul underneath the keyboards facing the organist’s legs. The cabinet volume is about 3.5 cubic feet.

Everything I have previously learned about speaker design is violated here. The box is not airtight, there is no bracing or acoustic wadding to absorb the rear sound, and the rear of the 3 speakers are all open to each other. This means that as the base cone moves backwards, the air pressure will push the cones of the stereo pair forwards, producing a negative sound wave.

I want to improve the sound so that I can produce a lower base note, and generally improve the acoustic delivery.

Does anyone have any experience of modifying (for the better) this type of sound production? i.e. could I improve the sound by:

• moving the stereo pair out of the cabinet, and then making the case into an airtight infinite baffle / reflex cabinet. (I would probably make separate enclosures for these, perhaps venting from the side panel)

• applying some acoustic wadding to absorb the sound from the rear of the woofer

• fitting a more heavy duty 12” base speaker.

• even using a pair of tweeters (with suitable crossover) for the stereo pair.

I would appreciate sharing the experience of anyone who has made acoustic improvements to their instrument.
martinhoffen
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Re: How to improve built in speakers

Postby scottherbert » Tue Sep 26, 2017 8:25 am

Hello Martin, although I am not familiar with your model, many organs have a provision for an 'upgrade' to external speakers. Do you have an owners manual to show you how to connect them?

~S
"Life is just a dream, it is in death that we truly awaken!"
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Re: How to improve built in speakers

Postby 1961TC4ME » Tue Sep 26, 2017 11:28 am

scottherbert wrote:Hello Martin, although I am not familiar with your model, many organs have a provision for an 'upgrade' to external speakers. Do you have an owners manual to show you how to connect them?

~S


I too would advise on going to a pair of external speakers vs. attempting to do anything with the internal console speakers. A good pair of tower speakers up in front to the left and right of you would make a tremendous difference in the sound. I suppose you could also use the internal speakers in combination with the external speakers, I've seen it done, you'd just need a sound card with the needed number of channels / outputs. Even though the speakers are located under the keyboards, it would likely add some nice dimension to the sound when used along with the external speakers.

Marc
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