I have been quiet on the Linn Forum the last week, but doing lots of work in the background to figure out the new SPACE Optimization.
The new SPACE Optimization is impressive and should give most people a significantly better sound quality than what they had before. The new filters are stunning and add a whole new dimension to the music listening experience.
I listened to the new SPACE Optimization with my custom filters turned off, and just using the Linn calculated room modes. Nice, very very nice indeed!!!
Most people should be ecstatic with the results they are getting with the new SPACE Optimization. I was.
As an added bonus, my sound quality in Exakt Surround has improved immensely with the new SPACE optimization!!!
But, I am Paulssurround and have a sordid reputation to maintain, and I am never one to leave well enough alone.
I have been playing around with the new calculated room modes and their adjustments, to now feel confident to make the following global suggestions:
These adjustments are unique for my Linn system, and as I have not been able to try them out on anyone else's Linn system yet, and your results may vary.
But if you are interested to try to get more out of your Linn system with the new SPACE Optimization, come along for the ride.....
Before, I had 2 calculated room modes (45.99 and 71.67 Hz) and I had created 3 custom room modes (21.5, 63.5, 74.3 Hz), and with the new SPACE Optimization I now have 5 calculated room modes, with just one custom room mode.
First I tried listening with all my original custom room modes which migrated into the new SPACE Optimization, and I felt I was getting better results than just the Linn calculated room modes alone, by doing a montage of all the new calculated and my previous custom room modes.
This gave highly satisfactory results.
But with more careful listening, I was able to identify some sound quality anomalies which I just had to explore.
I decided to work on each
calculated room mode, starting at the lowest calculated room mode frequency.
As in my SPACE optimization guide, I listen to my reference tunes, and then adjust the frequency very slightly up or down, by say 0.02 Hertz increments, to see if I am getting improvements. For example, if the Linn calculated room mode 1 is at 43.27 Hz, I would try out 43.34 Hz, 43.39 Hz and so on. Make sure you write down each change in case you overshoot the mark and get less enjoyable sound quality, you can go back to the previous adjustment value.
If you feel you need to adjust the frequency even more than what Konfig allows for a particular room mode, you would have to create a new custom room mode at that frequency and then you have greater flexibility to adjust frequency and bandwidth. Then be sure to turn off the old calculated room mode by setting the gain to zero.
When you get a single room mode frequency that sounds tuned in, then adjust the gain. I usually add gain, by going from -27.23 to -25.78, for example.
I do this for every new SPACE optimized calculated room mode.
After I have dialled in the frequency, I also go back to each calculated room mode and have narrowed the bandwidth slightly, to the narrowest Konfig will allow, without going into a custom room mode.
Now here is the issue I had to figure out, related to
custom room modes.
The new Linn calculated room modes seem to overlap in many cases, my previous custom room modes. At the very least, they are very close to my custom room modes, off by a several Hertz.
With careful listening, where the new calculated room modes are close to the custom room modes from before, or are very close, try the following.
If there is overlap of your old custom room modes and the new calculated room modes, you may be justified to eliminate the custom room mode that are the same frequencies as your previous custom room modes. If the previous custom room mode is close, but not overlapped by the new calculated room mode, then adjust the Linn
calculated room mode frequency towards the custom room mode frequency, so that it is as close to the previous custom room mode as before, and then eliminate the custom room mode.
Otherwise consider keeping the calculated and custom room mode if they don't overlap.
Now with very fine tuning, add some gain, and listen, listen, listen.
Repeat this for every calculated room mode and reassess the validity of each custom room mode if it is very close to the new calculated room mode values.
Don't forget to save a new profile for each major change you make, so you can go back to it, if you need to.
What about the previous custom room mode that was in the 16-30 Hz range that was not calculated in the new SPACE Optimization, but you had in the previous Konfig SPACE profile? In my case, I had previously created a custom room mode at 21.5 Hz for my Akubariks, and now still have that in place.
In my system, I have retained this first custom room mode, and it is very helpful in my system. However, I had to adjust the gain moderately, and in my case I have reduced the gain slightly.
If the new calculated room modes don't overlap your previous custom room modes, I would suggest that you consider retaining them as well.
Prior to the new SPACE Optimization, I had only 2 room calculated modes at 45.99 Hz and 71.67 Hz.
Then I added a
custom room mode at 21.5 Hz, and custom room modes at 63.5 Hz and 74.3 Hz.
Now with the new SPACE Optimization I have:
I have five calculated room modes with the new SPACE at 39.27 Hz, one at 45.99, (as before), one at 60.47, one at 71.67 (as before), and a new room mode at 78.54 Hz that I never had before.
After my adjustments, my calculated room modes are as follows:
Room mode 1 is at 40.93, gain is -21.30/-25.46, bandwidth 0.087990
Room mode 2 is at 45.99, gain is -29.6/-29.52, bandwidth is 0.083486
Room mode 3 is at 62.47, gain at -10.52/-15.96, bandwidth is 0.057144
Room mode 4 is at 73.67, gain is -14.46/-13.97, bandwidth is 0.048220
Room mode 5 is at 78.54, gain is -20.67/-21.75, bandwidth is 0.044001
In addition, I have retained my custom room mode at 21.5 Hz, but reduced the gain slightly.
Below I have pasted an excerpt of my SPACE Optimization guide to refresh your memory at the bottom of this post.
The whole thread is linked here:
http://forums.linn.co.uk/bb/showthread.php?tid=35880
How does it sound after all this wizardry?
With the new Christmas filters and new calculated room modes/custom room mode hybrid settings, it is extraordinary, exemplary and exciting in its musicality and clarity.
I will continue to plays around with it over the next while. Yeah, I know, rust never sleeps.
For Your reference, an excerpt from my Paulssurround SPACE Optimization Guide:
Adjusting SPACE Optimization:
You have measured all your room dimensions, added the room features such as wooden doors and windows, added your speakers, the speaker placement in the room and also your specific listening position.
Generally, I only add wooden doors as a feature, not door openings into adjacent rooms that don’t have doors.
I do add each window in the listening room, but not if it is a small window removed away from the speakers.
I don’t add the depth of a bay window, but I do measure the size of the bay window and add it as a feature, as if it was flush with the wall. I don’t add a TV, even though it is a large reflective surface, and generally ignore fireplaces, as a feature.
You press “Optimize” and notice you have a number of peaks on a graph.
You may notice that you have the following example calculated room modes:
Room mode 1:
Frequency: 43.65 Hz, Gain (-26.27), Bandwidth 0.082651
Room mode 2:
Frequency: 56.11 Hz, Gain (-20.27), Bandwidth 0.064871
Room mode 3
Frequency: 65.28 Hz, Gain (-14.75), Bandwidth 0.028693
Room Mode 4
Frequency: 72.83 Hz, Gain (-16.75), Bandwidth 0.020675
Of course you may have as little as 2 calculated room modes and in some cases as many as 7 or more room modes.
I will play around with the room dimensions and room features to reduce 6 or more calculated room modes down to 4 or 5. Sometimes you have peaks that are overlapping on top of each other. I generally will treat them as one room mode.
You listen to some of your reference music tracks with these calculated room modes and notice that sound quality is an improvement over what you had before. Job done? No!!!
Adjusting Room Modes For Bass Issues
With careful listening, you notice there is muddiness in the bass tracks on Buffalo Soldier and you can’t hear the growl of the bass guitar grinding its way through the track, with a perfect overlay on the bass drum.
Oscar Peterson’s You Look Good to Me has a beautiful bass line that should give you a lot of detail in the bass, as the strings are plucked, but on listening, you notice that there is not a lot of detail and definition in the bass line.
Lou Reeds Walk On The Wild Side has a wonderful bass line that repeats itself throughout the song, and you should be able to hear the bass strings being plucked and released, but you can’t. The bass string should have a very audible reverberation and when the string is released.
There is some work to do then.
When you have adjusted the bass properly with SPACE optimization, lots of detail will reveal itself in the midrange and highs you never heard before.
So how do I remedy this issue?
Whenever I see a calculated room mode 1 in the 35 Hz - 50 Hz range, it is a safe bet that there will be a real room mode at approximately half the calculated room mode that does not show up as a calculated room mode. However, it may not be exactly half the frequency, but off by many Hz above or below the projected value.
For example, if your calculated room mode 1 is in the 32Hz to 49 Hz range, there is almost certainly a real room mode in the mid to low 20 Hz range or may even be below 20 Hz. Thank you Linnrd, for this helpful discovery.
I have learned that different speakers seem to respond to specific frequencies.
If I am adjusting 242's without a subwoofer, I would start creating a custom room mode 1 at 23 Hz range, whereas Komris would be around 18 Hz, Exakt 350's with an Exakted Melodik sub was around 16 Hz, for example.
Origianl Isobariks might be at around 28 Hz and Keilidhs could be around 30 Hz. My Akubariks are around 21 Hz.
I don't know if this undiscovered lower frequency room mode is harmless or not, but it certainly has a major impact on bass overhang. Bass overhang can best be described as a muddiness in the bass, and can be heard as a "wooommmm wooommm woommm sound that is prominent in the music if you listen for it. Once you have identified it and then hear it prominently in many of your favourite tracks, it is a very good idea to create a new custom room mode 1 at the lower frequency.
You may not be able to hear it in all cases, but you will feel it in your ear drums as a sensation of pressure on your ear drums. This can also make the music unenjoyable, to the point where you may experience a kind of listening fatigue, and start switching to different music tracks part way through the song, and then go to the next song trying to find musical satisfaction, not realizing that the music sound quality is “off” and not enjoyable to listen to.
The key here is to be aware of your body and the sensations it is picking up from the music. You literally can hear and "feel" the music, as clues as to what is going on in your room and your speakers.
However, don't assume that all your bass issues are coming from low frequency bass in the 16-30 Hz range or lower. Often there are additional bass issues in the 60-80 Hz range that contributes to a muddy sounding vocals and instruments. Remember that 60-80 Hz is still low frequency.
Try different values and just listen. Preferably you do your listening with another person, to help you confirm it is an improvement.
Listen to Walk On The Wild Side, Buffalo Soldier and You Look Good to Me, over and over again. Move the frequency of the custom room mode one up and down, until it sounds better, to see if you are in the right frequency range.
If that sounds good, move the frequency up and down by 1.0 Hz at a time. So try 21.4, 22.4, 23.4, 24.4, 25.4 and so on, to see if you are going in the right direction and the midrange and highs become more clear? If not , go back to 21.4 Hz and then go the other direction, to 20.4, 19.4 Hz etc. If you like what you are hearing, it is time to fine tune the frequency, to 22.53, 22.63, or go to 22.22 and lower, until you hear your Linn system sounding its best.
Now that you have dialed in the best sound quality at a specific frequency, adjust the gain. For example, if the gain of room mode 1 is (-26.47), start off with a gain of about (-12 dB) for your custom room mode, then adjust up and down in gain to see if the sound quality improves?
Don’t forget to write down every change you make to frequency, gain and bandwidth as you go along, with a pen and paper. Otherwise, it will be difficult to go back to a setting that sounded really good, and you want to go back to.
Don’t forget to “Save” the profile as you go along, if you like the settings.
If you really like a particular profile, use the “Save As” button and give it a new name. For Example: Paul’s Test 1, Pauls Test 2, and so on.
For the bandwidth, I aim for the narrowest bandwidth possible that will capture the bass, with the filter. I try to aim for a bandwidth of 0.014227, as the narrowest allowable bandwidth at the moment. However, you can widen or decrease the bandwidth easily with a custom filter. If you go too wide, it will not give you good sound quality.
Narrowing the bandwidth to the narrowest possible will give stunning results.
So that should take care of your new custom room mode 1 for now. But it is now time to revisit the original calculated room mode 1
Example calculated room mode 1:
Frequency: 43.65 Hz, Gain (-24.27), Bandwidth 0.082651
Going back to Konfig calculated room mode 1 and move the frequency up slightly from 43.65 to 43.79, to 43.99 Hz, 44.12 Hz, 44.24 Hz and so on. Alternately, go the other direction and try listening with calculated room mode adjusted to 43.48 Hz and then lower, to see if you can hear a difference.
I have found in most cases, not to eliminate calculated room mode 1, if it is in the 30-50 Hz range, but will adjust the frequency, gain and bandwidth moderately.
In fact, I will often leave the calculated room mode 1 bandwidth more or less as calculated. However, I will move the frequency up or down in small increments until I find an improvement in sound quality.
Please note though, with a calculated room mode, you are very limited in how much you can adjust the frequency and the bandwidth. That is why I will create a custom room mode if I can’t get the adjustments that I want.
Then I may incrementally increase the gain, for example from -24.27 to -24.45, to -24.63 -24.78. Alternately, you could reduce gain to -24.13, to -23.88 and so on. Usually an increase in gain of 2-3 dB for calculated room mode 1 is enough and yields the best results, for calculated room mode 1
Once you have a good sounding frequency for calculated room mode 1. Try add about 3 dB of gain and see how that sounds? I find a slight boast to room mode one is helpful. Again, adjust the gain in very slight increments, until you get a sound quality your like. So if the calculated room mode 1 is 43.65 Hz, at -22.34 dB you may find the best sound quality is about -21.00 dB or -19.53 dB range. Your results may vary and don’t be afraid to experiment.
The bass is now deeper and more musical. Yet it is very easy to carry on a conversation in the room at loud volume, without raising your voice. The mids and highs are greatly improved, with awesome dynamics, detail, transparency and musicality.
What do you do if Konfig has already calculated a room mode 1 in the 20 Hz range?
I have seen enough Linn systems now, that I can say that sometimes SPACE optimization does calculate this lower frequency room mode in the 20 Hz range. If that is the case, then I adjust the frequency of this calculated room mode 1 up or down in frequency as well, to see if you can capture the specific frequency, and zoom in on the specific frequency that is excited. Then create a narrower notch filter at that frequency.
If you create a new custom filter to replace an existing calculated room mode, so you can make bigger adjustments to frequency and bandwidth, make sure you change the gain on the original room mode to zero, yes “0”.
This will involve creating a custom room mode at that frequency that is a very narrow notch filter. Then you must play with the gain on that room mode. I have the best success with a narrow bandwidth notch filter, but sometimes I have to widen the bandwidth to capture a bit more of the offending frequency.
You always have your saved favorite optimization profile you can go back to if you don’t like the result.
For the calculated room modes, you can only move the frequencies slightly from calculated, maybe a couple of dB on either side of the calculated frequency. Even so, it is highly worth while to see if moving the frequency of your calculated room modes incrementally up or down, improves the sound quality.
If it sounds better, it is better. Make sure you save your settings after each adjustment, otherwise you run the risk of having a great sound quality, but without saved settings, will lose everything.
Also write down all your changes as you go along, for frequency, gain and bandwidth. Then you can go back to changes that sounded good, if you overshoot the best sound quality.
Record your final results so you can go back to them later if needed.
Don't be afraid to create additional Profiles, and a back up of your favourite sound quality profile.