filo97s
Active Member
Hi, In the past months I felt that my system lacks something, then I realized that doesn't have the bass impact I wanted. I've looked around for a sub but the really good ones are quite pricey so since i love DIY projects, i've done some calculations to build a sub using a Dayton RSS390HF-4 and a Dayton SPA250DSP amp module. First of all, has anyone tried them, how they perform?
Math led me to a dual configuration: a bass reflex sub SBB4 aligned with Vb of 180 liters, Fb of 21Hz and F3 of 20.5Hz using a dual 75mm x 275mm reflex port (is this enough to prevent air blowing? Increasing diameter is not that easy because the length will increase too) which can be closed if necessary, leading to a sealed sub Bessel BL2 aligned with a Qtc of 0.577 and an F3 of 35Hz. Feel free to suggest something here, very happy to hear some comments, but this is not the point: I'm actually using a power amplifier based on an Anaview class D module for the speakers, wired in XLR, the volume then must be regulated prior with the DAC. My question is: how can I use the full power (or at least, how can I be sure that the sub will not play lower than the speaker amp) if I send a volume regulated signal into it? Apparently, looking at the SPA250DSP manual, it can do a lot of things but the XLR outputs (those that go from the subwoofer to the speaker amplifier) cannot be lowered in volume.
Thanks!
Math led me to a dual configuration: a bass reflex sub SBB4 aligned with Vb of 180 liters, Fb of 21Hz and F3 of 20.5Hz using a dual 75mm x 275mm reflex port (is this enough to prevent air blowing? Increasing diameter is not that easy because the length will increase too) which can be closed if necessary, leading to a sealed sub Bessel BL2 aligned with a Qtc of 0.577 and an F3 of 35Hz. Feel free to suggest something here, very happy to hear some comments, but this is not the point: I'm actually using a power amplifier based on an Anaview class D module for the speakers, wired in XLR, the volume then must be regulated prior with the DAC. My question is: how can I use the full power (or at least, how can I be sure that the sub will not play lower than the speaker amp) if I send a volume regulated signal into it? Apparently, looking at the SPA250DSP manual, it can do a lot of things but the XLR outputs (those that go from the subwoofer to the speaker amplifier) cannot be lowered in volume.
Thanks!