Damn tiring but absolutely worth it!
I found the problem to the surround left not having sound, turns out the spades were not connected properly , so everything was fixed and all working well now
Just Day before Yesterday I fired up the system for stereo, couldn’t stop until 2am
With the speakers distance now 3m apart from LR, and 3m to MLP, they form the perfect equilateral triangle and I proceeded to test a few familiar songs
I first tested with toe in, and then without.
I also used this clip to dial in the stereo image
https://drive.google.com/file/d/1aCVH1Dx8Fx54-IPEwqlIbEZbyDGc3UpK/view?usp=drivesdk
It’s got 9 Tok Tok Tok sound, of which the 5th sound is at dead centre.
Here is the difference , with the toe in, the width was somewhat limited to just beside the speakers. Whereas without toe in, the 1st Tok Tok extends wider out to left of the left speakers. The sound on the width, that was the difference
With this clip, it was easy to determine, which approach would result in a better stereo experience
True enough , I compared all familiar songs. What’s really different, is not the vocals from the centre image,( that was pretty close) but rather the background instruments , they extend wider when not toed in
Then came vocals, with the results of non toe in, the shelving happens pretty steep post 10khz, the airiness from the ribbon tweeters were not to my liking.
Enter toe in, this improved significantly as I was listening more to the speakers than the room
Then I realised, the 3m-3m-3m distance is not really ideal ! As I experimented, I was positioning and listening at the same time measuring to see the difference, rinsing and repeating the process to and forth with the same song
It turned out that 3m -3.2m -3.2m sounded best
What I have realised is that not every triangle is the same. It is better to have a shorter distance between left right speakers, but longer distance from the speakers to the MLP. So if you are going 2.6m between LR speakers, then the MLP should be > 2.6 away from the LR Speakers
This method produced superior results in many ways
The conclusions I derived, is to always toe in the speakers , they will almost always sound better. Here is the breakdown on why
- Better directivity from the tweeters on mid highs with extension for airiness
- No issues with stereo image as long as they are equidistant
- There is no presence of piercing or fatigue as most music content centres around 60hz- 12khz range. My hearing is best up to 14khz only. Beyond that I can hardly hear anything
- Decay on the Upper frequencies are much more linear because the early reflected energy no longer dominate , in the process removing as much of the room effects
- C50 speech clarity and C80 musical clarity is much more linear with toe in
- Impulse is much improved , hence an improvement in the timing response
- Frequency response for the lower octave in the bass region does not change. That only changes as we move the speakers towards/away from the boundary, be it front wall or side walls. So no diff here. It’s all about the mids and upper frequencies
I must stress the following exercise was conducted in my room, I’m not sure if the same thing applies in other homes. But I suspect it’s not going to deviate much, it’s gonna be pretty much the same
I’ll share the objective measurements soon
Conclusions from my exercise, toe in works best , how many degrees may vary, but 10 degrees with the MA at 3m distance apart LR sounds fantastic