hmm i have read my manual several times and cant decide if i'm reading it corectly... i was considering usuing a ported box for awhile because i read in my EQX manual it had a sub sonic filter... but then i read it again and it says it acts similar to a sub sonic filter.... so i'm not sure what to think about it. and do not wish to risk damage to the sub could one of you guys familar with EQ's take a look at the manual online and tell me what you think? thanks alot as always.
http://www.audiocontrol.com/MobileAudio/Products/Equalizers/EQX.html
PS
if you want to see a really cool new peice of gear check out there new DQX i was pretty impressed by it... sure it lugs a hefty tag though.....
Replies (3)
swez on 07/21/2004 19:14:31
From what I see on the install manual for the EQX, you have 7 bands of mid/highs EQ and six bands of bass EQ. The 31.4 and 45 Hz selectors can be used as subsonic filters. The 45 Hz can be used sparingly for boost or cut. The 31.5 can be set to full cut (-12dB) and that will reduce subsonics to your ported subs to safe levels.
There is also a module inside the EQX that can be adjusted to provide a -18dB PFM circuit to remove very low frequencies. This is the device you need to understand better. From the factory, this filter is set at 33 Hz. That should be good enough, coupled with your 31.5 Hz EQ dial set flat to -12dB. Have to pop the top off the EQ to review the present module settings and insure it is activated. See page 22 of the .pdf for details. Page 27 notes modules can be ordered for filtering ranges between 15-100 Hz. For 35 Hz, the resistor needed is:
7200/35 = 205.7kohms 2.0 Mohms is close enough. The 33 Hz
filter resistance should be 218.2Kohms or 2.2 Mohms, and that should work just fine in conjunction with your 31.5 Hz. sub dial.
Swez
http://www.audiocontrol.com/PDF/OwnersManuals/MobileAudio/EQX_CS_OM.pdf
I believe you said your subs are tuned to 35 Hz now? If so, the PFM and use of the 31.5 attenuator should be more than adequate to prevent subsonic damage to your subs.
Do you understand what has been mentioned? I'd hate to lose you on this one.
Swez
uochronos on 07/21/2004 20:24:41
yes i understand so since the internal sircuit is set at 33 and the 31.5is set to -12 then i should be good aand pic up very little in the 30's and below.... sound like it well work out good then.... already i have the 31.5 turned to negitive when it hits really low frequencies my rear slide window in truck rattles very anoyingly hehe...
The PFM though the way i read it said it was similar to a subsonic filter? how is it differnt?
swez on 07/22/2004 08:11:30
The only difference I can see, is that you can change the range it operates at by changing the resistance value in that module. It is not selectable like flipping a few switches or dials on a knob... but more a preset value that can be modified by changing resistance values.
Am sure they (AC) could make this a variable control that user can dial in. But without an RTA, could be hit or miss and cause more problems than help. You know how some guys are with knobs... only 1 preferred setting... full tilt boogy! AC took the "idiot proof approach" and preset the PFM and hid it in the box.
FYI: There is very little music content below ~38 Hz. Low "E" on a bass guitar is in that range. Pipe organ, piano and synth are the few musical instruments that can go below 35 Hz.
Swez
http://www.audiocontrol.com/MobileAudio/Products/Equalizers/EQX.html
PS
if you want to see a really cool new peice of gear check out there new DQX i was pretty impressed by it... sure it lugs a hefty tag though.....
Replies (3)
swez on 07/21/2004 19:14:31
From what I see on the install manual for the EQX, you have 7 bands of mid/highs EQ and six bands of bass EQ. The 31.4 and 45 Hz selectors can be used as subsonic filters. The 45 Hz can be used sparingly for boost or cut. The 31.5 can be set to full cut (-12dB) and that will reduce subsonics to your ported subs to safe levels.
There is also a module inside the EQX that can be adjusted to provide a -18dB PFM circuit to remove very low frequencies. This is the device you need to understand better. From the factory, this filter is set at 33 Hz. That should be good enough, coupled with your 31.5 Hz EQ dial set flat to -12dB. Have to pop the top off the EQ to review the present module settings and insure it is activated. See page 22 of the .pdf for details. Page 27 notes modules can be ordered for filtering ranges between 15-100 Hz. For 35 Hz, the resistor needed is:
7200/35 = 205.7kohms 2.0 Mohms is close enough. The 33 Hz
filter resistance should be 218.2Kohms or 2.2 Mohms, and that should work just fine in conjunction with your 31.5 Hz. sub dial.
Swez
http://www.audiocontrol.com/PDF/OwnersManuals/MobileAudio/EQX_CS_OM.pdf
I believe you said your subs are tuned to 35 Hz now? If so, the PFM and use of the 31.5 attenuator should be more than adequate to prevent subsonic damage to your subs.
Do you understand what has been mentioned? I'd hate to lose you on this one.
Swez
uochronos on 07/21/2004 20:24:41
yes i understand so since the internal sircuit is set at 33 and the 31.5is set to -12 then i should be good aand pic up very little in the 30's and below.... sound like it well work out good then.... already i have the 31.5 turned to negitive when it hits really low frequencies my rear slide window in truck rattles very anoyingly hehe...
The PFM though the way i read it said it was similar to a subsonic filter? how is it differnt?
swez on 07/22/2004 08:11:30
The only difference I can see, is that you can change the range it operates at by changing the resistance value in that module. It is not selectable like flipping a few switches or dials on a knob... but more a preset value that can be modified by changing resistance values.
Am sure they (AC) could make this a variable control that user can dial in. But without an RTA, could be hit or miss and cause more problems than help. You know how some guys are with knobs... only 1 preferred setting... full tilt boogy! AC took the "idiot proof approach" and preset the PFM and hid it in the box.
FYI: There is very little music content below ~38 Hz. Low "E" on a bass guitar is in that range. Pipe organ, piano and synth are the few musical instruments that can go below 35 Hz.
Swez
Copyright ClubKnowledge 2009 * All Rights Reserved
