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stevie7V wrote:

… they can be used effectively in parallel with the main speakers and running about 5 or 6 dB quieter.  I use them with a separate amplifier and adjust the volume until I 'just can or can't hear them'.  At this level, I can tell that they're on by listening to the sound from the back of the room.

Sorry, Winnie, stevie7V, Podium Sound and NXT.

You are new people to me and new speakers to me and I did not “get” right the way who is who.

It is apparent that we in one way or another use the same “Injection” ideas, this I am religiously for time aliment or at least attempts to do so. Since you both from UK you should know the specific of Tannoy Red coloration, so you should have an idea what I am trying to “Inject”.

The success of injection might derive from 3 elements:

1)     Coloration of the Injection channels
2)     Negative Impact it has on main channels
3)     Adjustability of Injection (crossover, volume, TTH similarity…. etc), that is included in #2

Still, instead of subjecting to people to search “interesting colorful” drivers I would propose, in addition, to look in another direction. We could inject colors (as I do) or… texture. Here is a very interesting fact - a proper amount if texture does expedite colors. If it is not enough then I perfectly can see two Injection Channels – one for Color Injection another for Texture Injection. Pretend a TV where you set with your main speakers brightness and contracts, set with your Color Injection the saturation level and set with your Texture Injection the sharpness of your TV of the ability of your super-duper high resolution TV to display the walk into fog during the Casablanca’s last episode.

I very recently began to think about Texture Injection as any former know to me way to “increase sharpness” were accosted in my experience with harmonic fuckunization and deformation of  acoustic-like TTH characteristic – a big taboo to me. So, the big question would be: what I might propose to deal with Texture Injection but do not screw up nether with tone, not with harmonics nor with transients?

Make an experiment. Buy, borrow or steal somewhere an amplifier with switching power supply, or class-D amplifier not any of them but the cheapest possible, the one that operated at lowers possible switching frequency. You might buy such an amp for $50 or even less. Some of the crappies of them call subwoofer amps, they have 200hz low pass filter and their pulses are switching juts above 50kHz. (It calls carrier-frequency). Get rid of any speaker level 200hz low pass filter and out EMI filer from this amp; connect your low-passed at 7khz Texture Injection channel to this amp. How you will have an amp that will pump into your mid- and sub-mid frequency loudspeaker a HUGE amount of HF noise all the way from 10K-20K (they uselessly have internal second order) to 1/2GHz.  BTW, so not feel that UHF will be too much attenuated with amp filers as ay high frequency the ESR of the flirting cap is too high and in these cheap amps no one will use good coils to filter. Surely, with your low-passed Texture Injection channel you will not be able to hear the UHF sweating nose but the fun part that it will be there and it will be auditable as none-random wide bandwidth forth that will stress and massage your  Injection channel adding to it a feeling of texture and sharpness.  From here you might use LC chins to mitigate the depth of the Texture Injection, along with the volume of the Texture Injection Channel relative to the main speakers. If you have a dedicated upper bass channel driven from own amp then you can use this principle of Texture Injection right combined with your main speaker’s upper bass channel. I tried it (using APS PurePower regenerator with 20kHz carrier-frequency) and it works wonderfully.

Now the biggest question is: can the Texture Injection + Color Injection substitute a spontaneous “Resonating Oops”? Why the hell knows. The advantage of deliberate injection is that it is managed and predicable, of course if a system designer has sensibility and sensitivity. I am sure we all when over the situations when we bought some 50-70 years old junk, brought it home, got hypnotized how interesting the “Resonating Oops” was working on that loudspeaker? Then the speaker was sitting in your room on pedestal and you were for years afraid to fart toward to it. Was that speaker able to do anything else good beside the “Resonating Oops”? I do not think so. Using the moderate and deliberate Injection is it perfectly possible to write into sound of properly performing playback the tone and texture that the 50-70 years old grandfather-speaker could not even dream off….

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