One of the advantages of the 8x12DL over using a DDRC inline before another processor is that it can automate this step: It can be set up using a Dirac channel per driver initially to provide precise time delay settings that can then be copied to another 2ch L/R config.TIME ALIGN EACH DRIVER USING MEASURING TAPE(on Helix or other DSP)
*optional*USE NULLING TECHNIQUE (Drop1’s METHOD)(on Helix or Other DSP)
I recently started doing this to fine tune T/A or phase. I perform it within each like pair of drivers first, then perform it again with like pairs against other like pairs. I use the front mid-bass drivers as the anchor for the system. I inverse polarity on the midranges and alter delay (been playing around with the method by either altering T/A or altering phase) until tones are most out of phase then flip midranges polarity back to normal. Next is to proceed to do the same thing except this time with midranges anchoring against the tweeters. I invert polarity on the tweeters and alter delay until tones are most out of phase then flip tweeters polarity back to normal. Lastly perform this step again with midbass as the anchor against rear fill drivers and subwoofers.
This is the way amps are bridged. One has reverse polarity. So when one side swings up the other swings down. In effect doubling voltage.i copied this from Wikipedia for reference.Why would you reverse the polarity of one channel? Yes you are nuts but you arent the first to think of itHas anybody ever heard of using 2 outputs with the same signal and reversing the polarity to double the output voltage of a dsp? Just like bridging an amp. Since 2 of the 4 outputs will be unused on the ddrc 24 I bought I was thinking I could double my voltage that way. Am I onto something or am I nuts?
Just last week I was contemplating the same.
Since my amp takes 2 inputs to bridge (duh) I considered using 2 channels of dsp for each mid.
No doubt it would work but why? Amps have a low/high input and my helix can already put out an 8v signal.
It was neat to think about but I couldnt see any real value. The amp will only make as much power as it will make no matter how much voltage you force feed it.
Since Dirac is performed while signal is digital I do not notice any degradation that one *might* experience with an extra AD/DA conversion.What difference did you notice with the addition of the DDRC22D?
Yea DDRC24 only has analog outputs.So using analog inputs one would have to use a ddrc24 then analog only into a helix? There is no way to use to toslink in or digital coax hec card? Mini DSP needs to get on that if not.
Also would you use the helix to do remote?
Your correct! Only thing holding me back from 8x12DL and the whole reason for using DDRC22 + Helix is that for my build I need a better control interface like the Helix Director.One of the advantages of the 8x12DL over using a DDRC inline before another processor is that it can automate this step: It can be set up using a Dirac channel per driver initially to provide precise time delay settings that can then be copied to another 2ch L/R config.
Helix DSP Pro Ultra (aka mk3).What is the ultra? And yes does the helix turn on the mini DSP and amps?
When the 2x4hd was released they had issues with minidsp not supplying enough current. They took it off the item page as recommended for about 6mo and beefed it up a tiny bit (bigger diodes from what I can see I have both) than added back to the HDs accessories.Helix DSP Pro Ultra (aka mk3).
In regards to turning the DDRC24 on. Oabeieo has had success using miniDC from miniDSP which is a DC/DC isolator and remote turn on device. However, it was originally created for the mini DSP 2x4 non HD version. I don’t know if its the higher current draw from the DDRC24 unit, but I tried twice and was unable to get my DDRC24 to turn on via the miniDC and I have very solid 14v+ electrical (perhaps user error with how i was connecting it?). The DDRC24 runs on 12v power and input is a 5 x 2.1mm DC barrel port. No separate + and - terminal and no remote turn on terminal.
I power my DDRC24 with this:
And this power supply I have connected to a switch power source that turns on when accessory power is on.
The DDRC22D runs on 5v power and also only has 5 x 2.1mm DC barrel port. Like Oabeieo mentioned, I use a 12v to USB product like:
Then use a USB to DC barrel cable. The 12v to USB product is also connected to a switched power source.
Maybe more people can chime in with their experiences with the miniDC. If it does indeed power the DDRC24 then one could in theory use the Helix remote to trigger the miniDC.
Have you tried specifically with a DDRC24? I know it is literally the same hardware as 2x4HD but the firmware upgrade apparently causes it to draw even more current than the 2x4HD:They took it off the item page as recommended for about 6mo and beefed it up a tiny bit (bigger diodes from what I can see I have both) than added back to the HDs accessories.
I'm curious to know also. I orderes the ddrc 24 and the DC isolator. Mostly because it has a turn on wire so I wouldnt need to wire up a relay.Have you tried specifically with a DDRC24? Literally the same hardware as 2x4HD but the firmware upgrade apparently causes it to draw more current than the 2x4HD:
I am leaning towards probably not.I have an isolator from my old mini 2*4 it's older so I bet it doesn't work with the 24
If I just set electrical crossovers they are really far off. My mid electrically crossed at 350 to 3000 ends up being around 250 to 3200 acoustically. Even if I cross them at something that helps me get close to a good acoustical crossover they are still way off. Miles off. Do I just use eq on the Helix only in the crossover regions?You really shouldn't EQ using the Helix. That may end up distorting the phase information that Dirac Live is preserving.
Try this... Use only the Minidsp to do all the EQ correction then use only the Helix to do the crossovers if you're active. LW 24db slope on everything so all the drivers are in phase.
Then if you feel like you have further corrections to make then use the Helix's EQ to do that but turn the EQ bypass on and off on all the drivers to AB. Listen for loss of focus and smearing.
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Have one running one now as we speak . No issuesHave you tried specifically with a DDRC24? I know it is literally the same hardware as 2x4HD but the firmware upgrade apparently causes it to draw even more current than the 2x4HD:
how much is too much when doing eq on my system before I put in the DDRC-24? Ive eqd each driver minimally and here is my left right response graphs, Ive separated them by 5 db so they are easier to see. hoping by adding the DDRC-24 before my helix cleans stuff up a bit. Not caring so much on the curve but how it sounds. Of course ill add my sub in the mix first.