SnowDrifter Posted March 24, 2013 Report 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
SnowDrifter Posted March 24, 2013 Author Report 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
SnowDrifter Posted March 24, 2013 Author Report 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
SnowDrifter Posted March 26, 2013 Author Report 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
zxsonnyxz Posted March 26, 2013 Report 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!
Noel989 Posted March 26, 2013 Report 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/
SnowDrifter Posted March 26, 2013 Author Report 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
Wicks Posted March 26, 2013 Report 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
SnowDrifter Posted March 28, 2013 Author Report 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
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