Do you mean speaker cables? I used to tried various kinds of SP cables including rather expensive ones, but now I stick to thick 5.5 sqmm or 3.5 sqmm reasonable price 600V VCT (Vinyl Cabtyre) cables;Was wondering, are there 6-line / 8-line co-axial wires of appropriate gauge thickness for such an application? It would certainly make connections a lot cleaner in my opinion.
A super project! NS1000s are amazing speakers, have owned them for many years. The mid and tweeter have very low distortion.Phase issues...-2-
Since I have no further physical renovation plan for my SPs at present and I will just change the driving engine from current single-DAC+single-amp to multichanne-DAC+mutichanel-amp, my present really nice "total sound quality" should be my standard reference sound throughout the project.
Even though I have a lot of experiences of attending the listening sessions for modern very much expensive SPs, ex. B&W 800 D3, Sonas Faber IL Cremonese, etc. at nice audio showroom in Akihabara Electric Town in Tokyo and at several very nice small hall-theater in Japan, I still do believe YAMAHA NS-1000 (as well as NS-1000M) is one of the best SPs in the history of Hi-Fi audio.
Let's look at carefully, therefore, the original YAMAHA's design and LC-network of NS-1000;
View attachment 58440
As we can easily find so may reviews on NS-1000 and NS-1000M, here I will not go into the details of rigid well-designed cabinet, magical 3D alignment of WO, SQ and TW, and the wonderful specs and sound of WO, Be-SQ and Be-TW (Be = Beryllium).
For our discussion on phase issues, I would like to have closer look and understandings on its original LC crossover network;
View attachment 58441
As you can see, this is a very simple and conventional 12 dB/Oct high-cut low-cut crossover network, and we should notice the connection to Be-TW is inverted at the TW's cable terminal. After my recent renovation of moving the network+attenuators into outer box and direct cabling to WO, Be-SQ and Be-TW, I can now very easily hear the stereo sound of WO only, Be-SQ only, Be-TW only, Be-SQ+Be-TW without WO, etc., and of course all together.
Whenever I hear the "Track-2 Phase Check", "Track-3 Five Positioning/Location" and "Track-9 Sine Sweep 20Hz to 20kHz" of the "Super Audio CD" (see my post #26) only with Be-TW or Be-SQ+Be-TW, I am always much impressed by YAMAHA's fine tuning of the network coils and capacitors as well as the "inverted" connection to the Be-TW; the "phase perspective" is really smooth, natural, almost perfect, all over 20Hz to 25kHz. I believe this should be one of the many reasons that NS-1000 and NS-1000M have been used also as monitor SPs for a long period in professional scenes including many broadcasting studios/centers.
I believe that any physical 3D modification, such as "round edges" of the cabinet, should affect (better or worse) the 3D phase perspective of my NS-1000 which should be definitely avoided in this project (at present). I decided to use my NS-1000, therefore, "as it is now" for current multi-channel multi-amp project. In case if I would change several physical and/or network "parameters" for SPs, then I should be in confusion for the reasons of better or worse "total sound quality".
I added ST FOSTEX T925A (inverted connection, same as Be-TW), and SW YAMAHA YST-SW1000 which has phase inversion switch controllable by IR remote controller.
And in my recent (last summer) renovation to take the network+attanuators out of the cabinet into outer box with brand new coils, film capacitors and attenuators, I fully copied the YAMAHA parameters as shown below;
View attachment 58443
Using this renovated network+attenuators in outer box, now I have improved "total sound quality" which should be my reference sound for current project, expecting some (much) further improvements by eliminating coils, capacitors and attenuators; they are now consuming a lot of amp power before driving each of the SP units. The first to try EKIO crossover configurations after the arrival of DAC8PRO, therefore, should be quite similar to above current physical LC crossover, I believe.
Please note that the low-cut for ST is only one 1.50 micro-F capacitor providing 6dB/Oct slope; only this low-cut slope for ST will be inevitably changed if driven by dedicated amp, since EKIO's cut-off slope is 12dB/Oct or higher (steeper).
As for the SW's own high-cut filter, technical info from YAMAHA indicated that it is 24 dB/Oct BW LC filter, but, in any way, the SW has its own phase inversion switch.
to be continued to next post of "Phase issues...-3-" coming tomorrow, hopefully...