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Romy,

Sorry for taking so long to get back to you… (this being the summer time in a Latin country, I still have no internet connection at the new place).

Quote from Romy “If your lower bass channels run from 40Hz and down then the PS, size of the capacitors and the size of the output transformers for this lower frequency channels would be dominating in your amp.”

To clarify things, here is the way I plan to handle frequencies under 500Hz :

Upper Bass : Frequency range between 100 and 500Hz – Driver loaded into a 120Hz straight horn, driven by DSET dedicated channel.
 
Mid Bass : Frequency range between 40 and 100Hz – Driver loaded into a 45Hz straight horn, driven by DSET dedicated channel.
 
Lower Bass : Frequency range under 40Hz – via a pair of large direct-radiating woofers in sealed enclosures - driven by a pair of 100 watt hybrid monoblocks (Lamm M1.1s).

Based on the info in the thread “Exceptional loudspeakers drivers: 18-inchers”, I would of course like to try the Aurasound 1808, but I am not at all sure I can find a pair of the original model… In that same thread, you mention the 833A tube could possibly be used to good effect in a DSET channel driving such a woofer… ultimately, I would like to consider this solution, in which case we would be talking about a 6th channel. For now however, I think it would be best to take things one step at a time, and leave this channel out of the DSET, driving it with the M1.1s (I don’t mind building a second version that integrates a lower bass channel, but would rather leave that for later).

Room dimensions : The “room” is actually a sort of loft; the main room plus immediately adjoining areas total to around 400 ft², with ceiling heights varying from 8.25 to 16.5 ft. for an average of about 12 ft, which works out to about 4800 cubic ft. How does this compare with your room?

Quote from Romy : “In context of this thread: you need to decide much power you would need from your LF channels and then ingrate or do not ingrate this solution into your multi-channel DSET” and “If you find that you need more power then you might go in your LF channels for parallel 6C33C, getting out of it 35W-40W…“

In the case of the Upper-Bass channel (100-500Hz) : The driver can handle up to 100 watts, and has an efficiency rating of 101db/w/m. I assume 20 watts would be adequate.

In the case of the Mid-Bass channel (40-100Hz) : The specifications regarding power handling and efficiency of the selected driver (Vitavox AK151) are not clear; the manufacturer says power handling is “determined by the associated horn characteristics”… In any case, 20 watts should not be too much for this driver. You are right, the real question is: Will 20 watts be enough?

I had planned to answer that question by connecting a pair of ML2s to the horns, but am having trouble finding a seller (early version ML2) who will ship to Europe.

Thanks for your thoughts,
Jd*

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