SMS-1 Question

[Vaughan100]

Alright things are much better today. I did what a member suggested and I reversed polarity on the SMS-1. Huge difference. That huge suck out before from 80 to 120 hz has been almost transformed.

I haven't used too much boost this time around. What I did was, I increased my sub level from -10 to -7 and I raised my gain control on my sub. When I did the graph I made sure that my speaker level hit 80 and I matched this for the subwoofer.

I noticed that, yes, the 20-25 hz content is around 3-4 dB's higher than it is unequalized. After this, I popped in some music. Now MUCH better. Everything sounds more balanced and fuller.

The funny thing is that now, my EQ'ed results are not that different from my unEq'ed results (there is a difference, don't get me wrong, but it's not as substantial as I made to make in previous attempts). The main culprit was flipping polarity from + to -.

Watching films, the deep bass is still there but just not quite as strong as after equalization which I understand.

I will post updated graphs today to confirm.

John, if I'm shooting for an 80 dB graph level so that everything inbetween 20 to my crossover frequency is flattish to 80 dB then all I need to do is to cut or boost to achieve that result, right ?

What do you mean by raising the overall level ? If I cut 20 - 30 hz and then boost the rest until around 70 hz in which case I then cut, is that not achieving the same result ? This time around, I almost had to cut 80 hz down all the way. This time around things were different.

The level calibration I'm starting to get confused (and believe me, I am) with because if I achieve the flat result using a baseline volume on SMS-1 at 19 (for both unequalized and equalized graphs) then go and raise the levels using pink noise in AVR afterwards, I end up increasing the levels by 2-3 on the SMS-1 volume so the levels then become 21 on the SMS-1.

This is what I need to achieve 73-74 dB's for the subwoofer level (both in equalized and non equalized level). BUT....but and this is what I'm getting confused with... if I THEN go to the SMS-1 graph display, will my bass then not be out of proportion because I just raised the volume by 2-3 to give me the volume of 21 ?

This is my stumbling block.

Help would be appreciated.

--Regards,

[Vaughan100]

Alright, some new graph's.

Unequalized :



Equalized :



My last attempt in class :



Tell me what you think ?

[Sonnie]

You can place the <img> tags around your link instead of <url> tags and the images will be visible within your post...

[Vaughan100]

I thought I tried that and nothing happened ! Gee whiz. .

I tried the same thing over at Audioholics and nothing happened. I just put [img] "picture file"[/img]

Is that right ?

--Regards,

[Sonnie]

Yep... or click on the icon and type or paste in the URL of your image and click OK.

[Kal Rubinson]

Sonnie wrote:

You can place the <img> tags around your link instead of <url> tags and the images will be visible within your post...

I see 'em just fine.

Kal

[Vaughan100]

Heh. So Kal, what do you think of my results ? Can my graphs be improved and if so, what more could I do ?

Perhaps I need to buy another PB10 ISD because once the subsonic limiter is disengaged, I'm boosting the low end baby !

Well, in moderation, of course.

This is not necessarily to create a house curve but just to create a flatter in room response where my output below 20 hz will probably be several dB's down. The only other factor which I haven't even factored in is that the Radioshack meter is already inaccurate and reads low frequencies low.

So if I create a truly flat response from 15 hz up to my crossover region, will that be indeed flat or is my Radioshack meter going to be inaccurate because it reads low frequencies, um, low ?

Your advice would be helpful.

--Regards,

[Sonnie]

Kal Rubinson wrote:

I see 'em just fine.

Kal

Yes, I edited them so that you can...

[brucek]

The only other factor which I haven't even factored in is that the Radioshack meter is already inaccurate and reads low frequencies low.

I thought the SMS came with an ECM8000?

brucek

[Vaughan100]

Brucek, it does come with the ECM8000. But I'm using the Radio Shack SPL meter to calibrate the actual SPL levels.

The behringer microphone is used with measuring and analysing room response.

--Regards,