[Rick Craig]

Before...





After...




This the Gamechanger line array.

[JohnR]

Is that an OB? Never mind. Now I see that it is the Gamechanger, which is a sealed box.

 

[Rick Craig]

Is that an OB? Never mind. Now I see that it is the Gamechanger, which is a sealed box.

 

I'm not sure if I could apply enough EQ to get that response with these woofers in a dipole. 

[JohnR]

I was just looking at the slope of the top curve.

[Tyson]

The other beauty of DSP is that if you get the standard 6db of room gain in the low frequencies, you can back off the bass boost a bit and dial the speaker in to the room. 

[Gatto127]

Rick,

I have DIRAC dsp available and listen to most of my music from my mac mini. I can boost the bass frequencies below 80hz. Do you think this is something applicable to the sealed version of Prestigio? In that we can have your cake (in terms of better phase coherence) and still get decent bass till around 40-45hz? I have enough class d amplification to drive through the sensitivity issues.

George

[Rick Craig]

Rick,

I have DIRAC dsp available and listen to most of my music from my mac mini. I can boost the bass frequencies below 80hz. Do you think this is something applicable to the sealed version of Prestigio? In that we can have your cake (in terms of better phase coherence) and still get decent bass till around 40-45hz? I have enough class d amplification to drive through the sensitivity issues.

George

Which unit are you using with Dirac?

[Gatto127]

I am currently using a pair of monitors I built myself.

I am contemplating upgrading to the prestigios - thinking about the sealed version and using dirac to fill up the bass? Hence the question.

[Rick Craig]

I am currently using a pair of monitors I built myself.

I am contemplating upgrading to the prestigios - thinking about the sealed version and using dirac to fill up the bass? Hence the question.

Ok - I just need to know if it's Dirac only or the software combined with a DSP crossover (MiniDSP,etc).

[Gatto127]

well - to be honest - I have both options - I also have a MINIDSP lying around. But Ideally I prefer using DIRAC only from my mac mini.

[Rick Craig]

well - to be honest - I have both options - I also have a MINIDSP lying around. But Ideally I prefer using DIRAC only from my mac mini.

No problem. I have limited experience with Dirac but I believe that you can draw a target curve to extend the bass. The amount of boost depends on what their filtering method will allow but you should be able to get some good results. If applying to a passive crossover then be aware that the boost will also be going to the tweeter. How much effect this has depends on the crossover point and slope for the ribbon. With the dual Seas drivers you should have good headroom provided  that you don't add too much equalization. The amount of boost depends on how loud you like to listen and of course the low frequency content in the recording. Shaping the target curve can affect the headroom as well.

[lowtech]

Rick: Are you demonstrating something other than a Linkwitz transform?  That's a fairly standard (and well understood) correction and can be done without using DSP.

The Wonders of DSP begin to shine when using its capability for multi-amping and room correction IMO.

miniDSP's capable of running Dirac can be combined to provide crossover functionality (you are only limited by the finite number of available taps).

[Gatto127]

If you are using minidsp and two amps the equalization need only be applied to the woofers. Then the question remains whether it involves boosting the lower frequencies, with the problem of accentuating any noise on the signal, or reducing the upper to mid bass, to arrive at a flat response curve up to 45 hz.

Rick,
Do you have any feel for how minidsp will perform this task - will there be a lot of audio degradation?

[Rick Craig]

Rick: Are you demonstrating something other than a Linkwitz transform?  That's a fairly standard (and well understood) correction and can be done without using DSP.

The Wonders of DSP begin to shine when using its capability for multi-amping and room correction IMO.

miniDSP's capable of running Dirac can be combined to provide crossover functionality (you are only limited by the finite number of available taps).

The LT is basically a simple 1-pole filter which as you noted can be achieved with an active circuit with or without DSP. All of the other benefits of DSP I enjoy as well on a daily basis in my system  .

[Rick Craig]

If you are using minidsp and two amps the equalization need only be applied to the woofers. Then the question remains whether it involves boosting the lower frequencies, with the problem of accentuating any noise on the signal, or reducing the upper to mid bass, to arrive at a flat response curve up to 45 hz.

Rick,
Do you have any feel for how minidsp will perform this task - will there be a lot of audio degradation?

Right - if you bi-amp (passive or active) you can avoid extra energy going to the tweeter. I use the MiniDSP 4x10 and don't have any noise issues. With the correct equalization you won't affect the upper or mid-bass.