luckybeanbean 寫:Rookie 寫:Raymond Wan 寫:Rookie 寫:luckybeanbean 寫:Rookie 寫:matt 寫:Rookie 寫:matt 寫:Rookie 寫:Just spent a little bit time to play with the Parametric EQ inside the SMS-1 tonight. It is so interesting!
Below are the revised SYSTEM SETTINGS & SYSTEM RESPONSE.
Special notes:
1. The volume of Preset 5 is changed from 20 to 25.
2. The Q values for all frequency remains default.
3. The output level below 20Hz can be boost for an additional 6 db. However, I have only boosted frequency at 15Hz up by 3 db only because boosting it up further may be too risky for the subwoofer. I believe that frequency below 20Hz can be improved a little bit further with subwoofer relocation. And, this will be verified very soon.
Hi Rookie,
Why your curve at 15hz is not at 80hz but below?
I read the manual, it should start at 76hz
Oh! What do you mean? You mean the decibel level of 15 hz should start at above 76db?
yes. then u can hv more straight line? i am not sure it is correct or not.
I see. That's what I wanna to do. Sooner or later, I need to move my subwoofer to a better location so that the frequency below 20Hz can be improved a little further without boosting it up too much by manual adjustment.
In fact, my subwoofer is M&K MX350THX, not Velodyne DD-12/15.
As what BeanBean said, M&K MX350THX rolls off very fast after 20Hz. It is really a weakness of the subwoofer itself.
I found that position is not the main problem
Agree. Moving the subwoofer around is only an option, but may probably not give out significant improvement in frequency below 20Hz.
And, I totally anticipated that M&K MX350THX has its limit in generating good quality of frequency below 20Hz.
I came across some literature in the past that the room size need to be of reasonable length in order to produce very low frequency such as those below 20Hz. If your room is not able to meet this minimum size criteria, even though your subwoofer can able to produce those low frequency but the generated frequency within the room will be deteriorated leading to relatively low recorded output.
My memory may be wrong !
Moreover, for normal people, frequency below 20Hz is not able to "hear" but may be someone can "feel" for those with sensitive skin or body. If this is the case, it may be totally acceptable for a good subwoofer performed consistently above 20Hz (major need) and it may not need although preferred to show some ultra performance below 20Hz.
That makes sense!
Even though the subwoofer itself is capable of producing frequency below 20Hz in perfect room condition, room acoustic and speaker placement in actual room condition are also key factors that determinie whether frequency below 20Hz can be generated or not.
Please excuse my stupid comment. I think room size might have some effect on the 20hz and below reproduction, but as you can see the below graph, my 100sq ft room can still have 10hz in large amount. It depends on the subwoofer too.
BeanBean,
Agree your comment that the SVS subwoofer can output large amount of frequency below 20Hz.
I wish that I could order a cylinder for my home too. Unfortunately, the 220V version is no long avaliable.
