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In the Forum: Horn-Loaded Speakers
In the Thread: Macondo’s Midbass Project – the grown up time.
Post Subject: The upcoming recalibration of Melquiades channelsPosted by Romy the Cat on: 10/4/2010
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 jessie.dazzle wrote:

Is this because of the way you are driving them?

When testing my one completed mid-bass horn (AK151 into 40Hz Exponential with 8" throat), and powering it from an amp that drives everything from upper bass to HF, the output was not noticeably louder than the rest of the horns. You have DSET amps and I am guessing that you ran the new horns form the outputs that once ran your direct radiating line arrays; is this the reason for the "excess" volume?

The excess volume is something that I well expected. I dive the midbass hors from LF Milq DSET, the one that I used for direct radiating line arrays. This Milq’s cha has no attention of any kind and runs full open. Calibration of the rest Melquiades channels was done in respect to sensitively of lower sensitivity channels, in my case it was bass towers. Now my midbass is around 109dB sensitively and it does not need as much gain, I think the lowers volume I am getting now from Upperbass channel. The HF has around 5dB reserve; the MF is about 1-3dB (necessary since I run in there DHT).The upperbass is now weakest channel and frankly I would love to have extra 2-3dB out of it in new much larger room.

If to look at the “B” channel of the Melquiades circuit:

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

then you will see 30K series resistor and 12.1K to the ground rough at the entrance of the upperbass channel. This is a voltage divider that attenuated my upperbass as it was sitting at VERY hot spots of my former room. Rising up or getting rid of the 12.1K resistor to ground I shall be able to get my few decibels of upperbass that will EQ upperbass what it need to be will set some focus to the upperbass in-front  localization. I also consider running it as bit higher then 500Hz as I have some response dip at 550Hz – I need to find out where it comes from.

Anyhow, it will be a lot of crossovers fine-tuning for next upcoming weeks. The main things that I need to deal with will be the 100Hz and 56Hz suck outs in midbass horns. Sure I will not be using the RELF resonators.  I think I would need to position or reposition some in the room to address it. The suck outs in not too nasty – juts 6dB and in a very narrow bandwidth. Let see if I will be able to smooth them out. Everything else it seems like I will have no problems to control…

The Cat

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