Reading my old post about my new R&E adventures

Midbass Horns and Real Estate

http://www.romythecat.com/LatestPosts.aspx?ThreadID=11190

 ….and contemplating on my prospective move to a big room I am strategizing what changes with Macondo and Melquiades it might trigger.

 I will increase the distance from Macondo to listening zone but I still will be in relative nearfiled. I think Macondo/Melquiades will handle the larger space to a degree. I think the limit will be in MF channel. Not I have -3.5dB with YO186 tube or -1dB with type 45. Sticking to YO186/RN460/2A3 I will have extra 3dB that would give me an extra twice distance. So, I might end up driving MF with no attenuation of any kind – VERY cool idea as it will be no inductance fight in secondary. In fact I very much see myself to set up the Macondo distance ….wherever the MF will hit my reference calibration dB pressure. It will be very good idea but it would be in very direct violation of DPoLS. I will see how it works…

The HF channel I have now at -5dB and I think I will be able to go away with it. The same goes with Fundamentals channel – I have a lot of attenuation in there that I might release. The Upperbass channel I hope that will not have problems as I have some of reserve in there. If you look at the Melquiades DSET circuit then in the B channel you can see 30K to 12.1K voltage divider that likes approximately 3dB.

http://www.romythecat.com/Site_Images/6-Chennal_Melquiades_DSET_Amplifier_Rev3.jpg

In addition I might engage the second half of the 3C33C that drives a little bit more gain and power (not a lot thought). Since I will be losing upperbass in the bigger room much faster I think that 3-4 dB that I will pick up by bypassing the Milq divider and use a full 3C33C might be no enough.  So, I am thinking to use the secret weapon of my Macondo – the highpass filter if my Injection channel.  Currently it is 120Hz but I might drive it lower. Combining with upperbass horn it doe VERY good sound and I hope this will allow me to load the bigger room properly.

The pride of my - the Melquiades’ LF channel will be gone in its current format. The monster 7Hz at full power, inductance only OPT transformer probably will be replaced with fast-core inductance only 20Hz transformer and my currant LF channel will be driving my new Midbass horns. The 15-18W of the full 6C33C will be enough I hope.

The biggest change I think will be with Bass channel. There is nothing in my currant setup that will be able to handle sub 40Hz at let say 800 sq feet. I would need to decide on topology of the channel and the amplification. I very much like how my line-array works – in fact I adore them. In the bigger room I would need probably to as 2-4-6 more sections – it will be all depends from the room.  Alternately I might put my array collection of 4 18” Aura drivers in use. Putting them into 40-50 cub feet box each might be a good direction to go. Then how to drive the thing? For 800 sq feet room I would need 200-330W minimum, how to get into this power?  A SS amp is a straightforward chose and it is what I might use initially but I have spoiled with SET bass channels and I would be very cool to have a powerful SET amp.

I might re-read my old threads:

More power from Melquiades? More powerful tube?: http://www.romythecat.com/Forums/ShowPost.aspx?PostID=5200

or

How to get a LOT of SET power: http://www.romythecat.com/Forums/ShowPost.aspx?postID=2136#2136

…  and might try the amp on GU-48 or the similar.

Whatever it is it sounds like it will be a lot of work…