Log in
Register
Home
Forums
New posts
Search forums
What's new
New posts
New profile posts
Latest activity
News
Members
Current visitors
New profile posts
Search profile posts
Features
Log in
Register
Search
Search titles only
By:
Search titles only
By:
New posts
Search forums
Menu
Install the app
Install
Reply to thread
Home
Forums
Pro Audio
Varsity
Damn you Bennett!
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Message
<blockquote data-quote="Ivan Beaver" data-source="post: 228" data-attributes="member: 30"><p>OK Bennet-now you have gone and messed things up.</p><p></p><p></p><p></p><p>Why do you make me go and THINK! and question things. Everything was nice and happy until you just had to go and compare DSP's now didn't you!</p><p></p><p></p><p></p><p>And you think you want to get data on the differences between DSP's. Well how about the differences between measurement platforms-HUH What about THAT for a project <img src="http://www.soundforums.net/images/smilies/icon_lol.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://www.soundforums.net/images/smilies/icon_lol.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p></p><p>Kemper Watson is bringing over a couple of his DBX DSP's for me to measure and give you the data.</p><p></p><p></p><p></p><p>So to get ready I setup my Smaart rig and did something stupid. I did a loopback test. Yeah I know-why do something stupid like that <img src="http://www.soundforums.net/images/smilies/icon_rolleyes.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p></p><p>I am using a Motu8pre as my interface.</p><p></p><p></p><p></p><p>I have done loopback tests with this unit before on Systune and all was fine, but never bothered to do it with Smaart V7. I just ''assumed'' it was correct. You know what happens when you do that now don't you.</p><p></p><p></p><p></p><p>So anyway I am getting an odd freq response. It is flat up to about 2KHz and then starts a rise of 1.5dB at 18Khz.</p><p></p><p></p><p></p><p>So my first thought is that the interface is not flat <img src="http://www.soundforums.net/images/smilies/icon_mad.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> . So I did a loopback test using Systune-without touching anything on the interface or setup and it is flat to 20Khz. <img src="http://www.soundforums.net/images/smilies/icon_confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p></p><p>I went back to Smaart and it was still off.</p><p></p><p></p><p></p><p>But that is not all. Systunes phase response is around 2° with a 30° rise at 18Khz.</p><p></p><p></p><p></p><p>Smaart V7s phase response is around -178° with a 30° rise at 18Khz.</p><p></p><p></p><p></p><p>So the shape is the same-but they are out of polarity. <img src="http://www.soundforums.net/images/smilies/icon_eek.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p></p><p>As the old saying goes- a Man with a meter is sure-A man with 2 meters is sure of nothing.</p><p></p><p></p><p></p><p>So what is correct? <img src="http://www.soundforums.net/images/smilies/icon_confused.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p></p><p>Yes I have already posted a question to Rational.</p><p></p><p></p><p></p><p>So realize that the curves I will be sending you will have a slight error on the top end-that is not a result of the DSP settings.</p><p></p><p></p><p></p><p>So take that data and - well do whatever you want with it <img src="http://www.soundforums.net/images/smilies/icon_lol.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> <img src="http://www.soundforums.net/images/smilies/icon_lol.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p></p><p></p><p>Just adding to the confusion.</p><p></p><p></p><p></p><p>Why does this stuff keep getting harder and more mysterious? Is anything real? Where's my RTA and I will call it a day. <img src="http://www.soundforums.net/images/smilies/icon_lol.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="Ivan Beaver, post: 228, member: 30"] OK Bennet-now you have gone and messed things up. Why do you make me go and THINK! and question things. Everything was nice and happy until you just had to go and compare DSP's now didn't you! And you think you want to get data on the differences between DSP's. Well how about the differences between measurement platforms-HUH What about THAT for a project [img]http://www.soundforums.net/images/smilies/icon_lol.gif[/img] [img]http://www.soundforums.net/images/smilies/icon_lol.gif[/img] Kemper Watson is bringing over a couple of his DBX DSP's for me to measure and give you the data. So to get ready I setup my Smaart rig and did something stupid. I did a loopback test. Yeah I know-why do something stupid like that [img]http://www.soundforums.net/images/smilies/icon_rolleyes.gif[/img] I am using a Motu8pre as my interface. I have done loopback tests with this unit before on Systune and all was fine, but never bothered to do it with Smaart V7. I just ''assumed'' it was correct. You know what happens when you do that now don't you. So anyway I am getting an odd freq response. It is flat up to about 2KHz and then starts a rise of 1.5dB at 18Khz. So my first thought is that the interface is not flat [img]http://www.soundforums.net/images/smilies/icon_mad.gif[/img] . So I did a loopback test using Systune-without touching anything on the interface or setup and it is flat to 20Khz. [img]http://www.soundforums.net/images/smilies/icon_confused.gif[/img] I went back to Smaart and it was still off. But that is not all. Systunes phase response is around 2° with a 30° rise at 18Khz. Smaart V7s phase response is around -178° with a 30° rise at 18Khz. So the shape is the same-but they are out of polarity. [img]http://www.soundforums.net/images/smilies/icon_eek.gif[/img] As the old saying goes- a Man with a meter is sure-A man with 2 meters is sure of nothing. So what is correct? [img]http://www.soundforums.net/images/smilies/icon_confused.gif[/img] Yes I have already posted a question to Rational. So realize that the curves I will be sending you will have a slight error on the top end-that is not a result of the DSP settings. So take that data and - well do whatever you want with it [img]http://www.soundforums.net/images/smilies/icon_lol.gif[/img] [img]http://www.soundforums.net/images/smilies/icon_lol.gif[/img] Just adding to the confusion. Why does this stuff keep getting harder and more mysterious? Is anything real? Where's my RTA and I will call it a day. [img]http://www.soundforums.net/images/smilies/icon_lol.gif[/img] [/QUOTE]
Insert quotes…
Verification
Post reply
Home
Forums
Pro Audio
Varsity
Damn you Bennett!
Top
Bottom
Sign-up
or
log in
to join the discussion today!