Hafler's passive pseudo-quadraphonic speaker hookup using a stereo amp
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outshined
Super Member
Nash,
The wall covering is Sonex by Illbruck, 3x5 ft. sections, used to absorb sidewall reflections from the speakers and further enhance the Holographic effect. It runs the entire length of the walls (can't see it in the pic.)
The backdrop are just those room divider type things. The small wooden slats also help to reduce, or diffract, sound from that wall.
If the C-7 has Sonic Holography built in, then the manual for it will have the info you need to properly set up your room, speakers, etc...
Let me know if it does:thmbsp:
Doug G.
Lunatic Member
Outshined has touched on a very important requirement for sonic holography and that is the taming of room reflections, particularly behind and around the speakers. Also behind the listener.
Sonic holography doesn't use reverberation in any way and it works best by the listener hearing only the direct sound waves from the speakers. You want the signals from each speaker to remain as pure as possible so the cancelling signals remain intact.
Outshined described this before but I will reiterate. The right ear should hear ONLY the signals from the right channel and similarly the left ear the left channel.
With regular stereo, each ear receives unwanted signals from the opposite speaker (slightly delayed by the thickness of your head :^) and this muddles the stereo effect, rendering it less than ideal. The sonic holography circuit and speaker set-up corrects this.
Doug
Sonic holography doesn't use reverberation in any way and it works best by the listener hearing only the direct sound waves from the speakers. You want the signals from each speaker to remain as pure as possible so the cancelling signals remain intact.
Outshined described this before but I will reiterate. The right ear should hear ONLY the signals from the right channel and similarly the left ear the left channel.
With regular stereo, each ear receives unwanted signals from the opposite speaker (slightly delayed by the thickness of your head :^) and this muddles the stereo effect, rendering it less than ideal. The sonic holography circuit and speaker set-up corrects this.
Doug
OK I finally set up the system close to what is suggested and the SH effect is very much present. It makes a postive effect on all the classical vinyl and jazz cd's that I have. What I am most surprised is by its effect on piano. I find that it tends to shift the sound a bit higher and is more realistic since a concert piano radiates sound upwards and around. How does SH manage to shift sound higher?
Perhaps I am mistaken but when I enable SH it appears to give the sound a bit of loudness boost too, somewhat like the loudness buttons found on some amp units; although very mild. Is this my imagination?
Nash
Perhaps I am mistaken but when I enable SH it appears to give the sound a bit of loudness boost too, somewhat like the loudness buttons found on some amp units; although very mild. Is this my imagination?
Nash
outshined
Super Member
Great!
It is very common, in my 30 yrs of listening to SH, that sound "images" have much more height and depth. This is, I believe, because as you pointed out with the piano, sound will radiate upward and around. The relationship of how instuments are recorded with regard to their sonic signature, radiation pattern and dispertion characteristics are restored with SH.
You are correct that SH will give a "boost" in the bass. Actually, this is what Bob Carver calls the "sonic signature" of the recording studio or concert venue. They all have a certain low frequency signature that is present in the recording, but lost on plain 2 channel listening. In my system, this signature is present as a very subtle, but very palpable, "feeling" that permeates the entire listening room. All around, if you will. It is not a simply a bass boost. There is no bass boost circuitry in SH.
I hope you like the effect. I would try and listen to some of the recordings I mentioned. You may or may not be a big fan but the effect is astounding, considering the fact that only 2 speakers are used.
I recently bought the 35th anniversary SACD (with the non SACD) version of DSOTM. I listened last night, (non SACD) and I heard layers upon layers of keys, guitars, and all the other sonic magic on this disc that were there previously, just not as lush and full as this disc provides.
Keep tweaking your system. You'd be surprised what a little speaker tweaking will achieve.