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Connecting extra bass speakers to my LX705
#2999694 07/07/20 12:26 AM
Joined: Jun 2020
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JackQ89 Offline OP
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I found that extra bass for the sound make the sound a lot better, I have an lx705 and I don't want to buy now a whole new Piano, I am satisfying with most features as it is, but I would like to know if it's possible? There is L and R connection to extra speakrs, would like to know which is the most recommend to add?

thanks

Last edited by JackQ89; 07/07/20 12:27 AM.

Owner of Roland LX-705 LA, But fan of Kawai
Re: Connecting extra bass speakers to my LX705
JackQ89 #2999711 07/07/20 01:34 AM
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i think you'll find that there are _lots_ of subwoofers (which is what you're looking for) that have a stereo input (separate L and R channels).

The subwoofer uses the pitches below X Hertz (X depends on the model, and may be variable) to drive itself, and sends the higher pitches on to smaller loudspeakers. (The subwoofer uses the sum of the L and R channels to drive itself; that's got some theory behind it, and seems to work OK.)

IMHO (this is strictly theoretical design logic, I've never tried it), since the LX705 has 12 cm (=5") speakers for its low frequencies, you'd need a subwoofer substantially larger to get much extra bass. An 8" or larger subwoofer should do nicely.

You're filling a living room with sound, not a concert hall -- you probably don't need a whole lot of power. There's 60 watts, total, in the LX705's built-in amps. 50-100 watts in the subwoofer should be more than enough. Check out "home theatre" equipment; professional PA sub's are likely to be more powerful than you need, and they're pricey.

One potential problem is getting a smooth transition between the subwoofer range, and the LX705's own loudspeakers. A second one is getting the correct "phase", so in that crossover range, the subwoofer and LX705 speakers are both moving in the same direction. Many sub's (all subs?) have a "phase" switch, to adjust that.

Have fun hunting --

Last edited by Charles Cohen; 07/07/20 01:36 AM.

. Charles
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PX-350 / microKorg XL+ / Pianoteq / Lounge Lizard / EV ZXA1 speaker
Re: Connecting extra bass speakers to my LX705
JackQ89 #2999731 07/07/20 03:45 AM
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If you use the L Output only, it works as mono.

For connecting to a sub, it's quite common to use a mono output.


Learning to play. Consciously incompetent, which apparently is a good starting point. smirk
Re: Connecting extra bass speakers to my LX705
JackQ89 #2999751 07/07/20 06:09 AM
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Might be as well to know the sub woofer will affect the upper frequencies too. It dampens them down, in effect, by raising its own profile across the entire keyboard spectrum.
Piano notes comprise several frequencies; even the higher nores have lower fequencies in there which will increase too, muddying the registers nicely.
I've tried this on my Yamaha, my previous FP50 and good ole Pianoteq. The latter needed the bass notes boosting in volume rather than bass-icity.
I reckon, too, having played the LX7 as well as the 17, you'll probably not improve on the sound with monitors of any description.
Maybe you've just got used to the sound you have, and been swayed with some of the chit chat here smile to which I am party . . .

GAS coming up! Be afraid . . . . . .


"I am not a man. I am a free number"

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Re: Connecting extra bass speakers to my LX705
JackQ89 #2999789 07/07/20 08:50 AM
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5" co-axial speakers aren't particularly known for bass response (but at least they're in a dedicated enclosure, part of the stand not the piano)... it might be possible to swap them for larger speakers (although that opens a can of worms as far as the enclosure volume is concerned etc etc).

Anyone fancy calling Heath Robinson?


Learning to play. Consciously incompetent, which apparently is a good starting point. smirk

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