SnowDrifter Posted March 24, 2013 Report Share Posted March 24, 2013 (edited) I have a Digital Designs X1 crossover which works great, but I'm concerned I might not be able to use the dd-1 with it. And I do not know enough about how to calculator crossover attenuation to figure it out myself Issue is that the high-pass portion of my crossover can only cross as low as 490hz. It's a line driver too, so there's that to consider. My concern is that 1 octave(1kHz) above the crossover frequency might not be high enough to avoid quieting down the signal, and possibly give a skewed reading. I could probably figure this out myself if I knew the equation for a crossover graph, but I'm spacing on how to figure it out right now lol Things to note: - This is a 24db/octave crossover - It is a line driver too - The lowest I can cross at is 480hz Edited March 24, 2013 by SnowDrifter Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 24, 2013 Author Report Share Posted March 24, 2013 Oh, and I'm not sure what type of filter it uses, whether it be Butterworth, Linkwitz-Riley, Chebyshev, or Bessel. So I'm in a bit of a tough spot there Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 24, 2013 Author Report Share Posted March 24, 2013 Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 26, 2013 Author Report Share Posted March 26, 2013 Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
zxsonnyxz Posted March 26, 2013 Report Share Posted March 26, 2013 An octave ABOVE the high-pass x-over frequency shouldn't be affected much, if at all. I think Quote STD Passat Build 151db+STD Omega BuildMitsubishi Colt Build - Alpine|Focal|PeerlessHome Stereo BuildSmall Tang Band build - 4" fullrangeBox for 4 8"My Saab 9000 Build- I'd be very happy if you cared to check out the logs and give feedback! Link to comment Share on other sites More sharing options...
Noel989 Posted March 26, 2013 Report Share Posted March 26, 2013 I don't really understand your question but it needs to open to their highest/lowest points highpass to the highest lpf and bp to their lowest point that Quote Build Log - http://www.stevemead...-cruiser-el-pt/ Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 26, 2013 Author Report Share Posted March 26, 2013 An octave ABOVE the high-pass x-over frequency shouldn't be affected much, if at all. I think I know it's affected some, but I'm not sure if it's something so small that I can ignore it or not Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
Wicks Posted March 26, 2013 Report Share Posted March 26, 2013 I checked the stats on on DD's website but they don't have much other than what you stated (24dB/octave). More than likely its Linkwitz-Riley, but for your question about before the cutoff frequency, it probably doesn't matter. Here's a plot of a 24dB/oct slope (LR filters are -6dB at fc): The fc is 80Hz. At an octave before (40Hz) you can see the slope just starts to drop. I've seen the same effect on other filters (Butterworth). At a full octave before the cutoff frequency, I wouldn't worry about any attenuation. Quote This post sent with 100% recycled electrons. 2004 BMW M3Mechman 280A 2 - XS Power XP30001 - XS Power D375 500F of Maxwell SuperCaps (soon to be 1000F) iPadMini2Dash mounted O-scopeAudison bitOne (Remote DRC MP) Highs Amp - PPI Art A404 Hertz HSK130 (HSK165 waiting...) DC Audio DC9.0K 2- DC Audio XL12m2LEGAL - 147.3dB @ 41Hz OUTLAW - 150.2dB @ 45Hz OUTLAW - 145.7dB @ 30Hz JUNE 2014 SOTM WINNER 2014 COLORADO PEOPLE'S CHOICE WINNER SOTM BUILD:http://www.stevemeadedesigns.com/board/topic/141656-wicks-e46-m3-build-bass-turbo-button-and-a-big-new-addition/page-68#entry2802026 Link to comment Share on other sites More sharing options...
SnowDrifter Posted March 28, 2013 Author Report Share Posted March 28, 2013 Figured it out: It's -.49db attenuation Quote ~~~~~~~~SAY NO TO PHOTOBUCKET~~~~~~~~ Snow's DD-1 tracks here: https://www.stevemeadedesigns.com/board/topic/167433-snows-dd-1-tracks/ My take on OFC vs CCA: https://www.stevemeadedesigns.com/board/topic/110381-things-that-piss-you-off-in-the-car-audio-world/?do=findComment&comment=2461444 Link to comment Share on other sites More sharing options...
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