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Original Message

RE: VTV Amplifier - Hypex and Purifi Amps

Posted by MarcL on September 27, 2020 at 13:38:12:

I tried many positions with the DWMs in the conventional setup with tweeters out as well as the Rooze setup. I placed them right against the wall at various distances in front, behind and aligned with the 3.7s. I measured the results each time with the DWMs and 3.7s alone and combined.
I know there is "folklore" about DWMs and 3.7s combining to respond "mid-20s" but I didn't see anything much under 30Hz.
What I did see was improved low end for the DWMs when up against the side wall ... a bit extended below 40Hz. And I saw improved mid-bass for the DWMs when 3-4 feet out into the room. What I need to complement my 3.7s is to fill in nulls aroun 70Hz and between 100 and 150Hz, so I optimized the positions out into the room.
I also aligned phase between the 3.7 and DWM each side using REW Impulse Response and Phase measurements. So I'm sure they're aligned.
In the midst of this I experimented with wooden baffles attached to the 3.7s on the woofer side. They're made from 12x72x1 inch oak boards, two of them hinged so I could expand them to two feet or fold to one foot. What I found was the baffles resulted in a boost of about 5db 80-120Hz peaking at 100Hz.
Note that I still have a big resonance peak at 40Hz and small ones above 100Hz, but I correct them with Dirac Live. Overall though the response is much more uniform with the DWMs.
Here's a diagram of my current setup.