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In the Forum: Audio Discussions
In the Thread: My new “New” listening room, 2024
Post Subject: Milq/Macondo 2024Posted by Romy the Cat on: 5/21/2024
 anthony wrote:
Both UB Horn roll off circa 130Hz in room.  There are a couple of rough MDF boxes here that I knocked up from spare sheet a while back.  Have not tested them specifically at the intended spot behind me but running around with a microphone shows those problem frequencies high at that location.  Probably need to get no lower than 40-50Hz with the midbass so was planning on using the Injection Channel from Melquiades and the Lundahl transformer, at least to start.  We will see.  The guy that wound my bass channel transformer is no longer doing it so if I go custom it will be with someone new (to me).

Yep, if you get 130Hr, you are at an unlucky bass spot. Your woofer towers are not so pretty at 100Hz. Those Scanspeak drivers do wonderfully at lower frequencies but are not too excited at 100Hz. Ironically, the fact that your room's upper-mid bass is unhappy is a perfect case for using a dedicated midbass channel. Remember my rule: do not fight room but use it.
 
It is serially your playback and you can do whatever you want. Still, I would like to pass some recommendations that are tested and in my view work very well.
 
1)    Since you use the injection channel, stop using it. The injection channel was a ridiculous idea with exceptionally beneficial results, but now I have found it better. You have two Tannoy Red 10 drivers. Use the HF section of them as tweeters. You will be very surprised how beautifully they work as twitters in the context of S2 drivers as a mid-range. You can drive it from your Milq’s injection channel or change the transformer on your Milq’s HF channel.  It still will be an injection as I recommend crossing it with the second order between 1800 and 3000 cycles. So, the S2 driver and the Tannoy tweeter will work together.  All unpleasantness off Tannoy Twitter that we know from the sound of complete Tannoy red drivers will not manifest itself. The Red will not need an enclosure. I however built a small box because it just looks ugly when they hang along. When I have time, I will ask my mechanic to cut off the low-frequency basket for Tannoy. It will undoubtedly demagnetize the magnet, so it will be a ceremony to put it all the way back together. I will also need my Macondo frame modification to accommodate the driver. For the time being, a small box was a quick and convenient solution. Also, I do not know if the Tannoy Twitter will change its own sonic signature without this large woofer cone acting as a small rate horn.
 
2)    Do introduce educated direct radiator mid base channel. If you convert your high frequency channel to drive Tannoy Twitter, then you have the injection channel of your amplifier free to drive your new midbass. You will need a lot of power and a lot inductance in your transformer for midbass. I feel that Milq’s bass is a perfect candidate. After you introduce midbass you will certainly change how you use your woofer towers. I can only assure you that if you cross them at let's 20-30 Hz put them on a transitional slope, and let your mid base to cover down to 40-50 cycles, then you will have a completely new sound from the Scanspeaks

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