No one on an internet forum will be able to tell you what crossover points to use to get the things you listed. It will depend on your install, the music you listen, the power you have among other things.
To give you an idea, my midbass are crossed over at 40hz and up. If you don't have your doors deadened correctly and other things right--you will smoke that midbass playing that low. If it is installed correctly, that speaker will do 40hz no problem.
On the tweeter anywhere from around 3200hz up to around 6-7khz could be the right spot.
I would start with the mid. the way I normally do it is to set a crossover at like 31hz on high pass, and don't set a low pass. Play some pink noise and look at the RTA. Where does the speaker naturally roll off on both ends. Set the crossover there. If the tweeter will play down to the low pass on the mid, then set the tweeter there. Play with the slopes and the phase at that point and see what sounds the best.
The subwoofer you can bring in later. Start where you highpassed your midbass. You may end up gapping them depending on the point you end up with.
posted
one of my installers has an old Toyota Landcruiser. He runs a 300/4, bi-amping his MBQuart fronts. He runs active. The tweeters were just too much for a single midbass. So he runs two 6.5" in each door and a single tweeter...it's sort of a D'Apolito setup on the doorpanel. sounds pretty good that way, but the extra mid made it sound much more balanced for high volume. Not sure exactly where he's crossedover, but the mids' lowpass is probably close to what Andy's suggesting
Posts: 5494 | From: Columbus, OH - formerly FL | Registered: Oct 2003
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posted
Andy, thanks for jumping in. Here's what I was actually asking. How do crossover points effect imaging? I know that when you use passives they introduce phase shifts around the XO points. Is this the same with active? When changing points of the XO is there any set rule, i.e. if you raise the XO from say 3.2kHz to 3.6kHz will that generally change the way the tweeter or mid images or is it all individual to the car?
The whole system is an Alpine 7939 (Volume and track control only), PXA-H701, CHA-S624 (linked to H701 optically), 300/4 powers the mids and tweets actively, and a 500/1 powers three 10W6's (96 versions)
Posts: 5 | From: Ohio | Registered: Feb 2009
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I was told and I think I saw on this board that I should proceed like this: Level TA XO EQ
Is that correct? If it is then do I just measure the distance to each speaker from my head then go through the math? Should the farthest driver ( front R TW for me) be 0??
Posts: 5 | From: Ohio | Registered: Feb 2009
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Andy, do you have experience with the Quart Competition series? A lot of people confuse them with the Q series and the older, lesser QM series. I have found just one other person that even has a set of these things on the internet.
Posts: 5 | From: Ohio | Registered: Feb 2009
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I've played with QSD and QM series. Not the competition series. What is the difference between the QSD and the competition? I'd bet just the passive--which you wouldn't want anyway.
-------------------- vinny - Street Stock Passion for sound automotive since 4 years, I had my dream realized, who was participating in a World Cup, now with this conquest I commit to improve my number Posts: 40 | From: Sao Paulo | Registered: Jun 2009
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HI. I INSTALL THOSE PROCESSORS AND HAVE VARIOUS CONFIGUARATION. HOW MANY SPEAKERS YOU WILL USE IN THE FRONT; IN PXA-701 HAVE F-1 AND F-2 YOU HAVE F-1 IN TWEETER AND F-2 IN FULL RANGE. F-1 CAN BE USE IN FULL RANGE TOO. TELL ME THE CAR AND THE SPEAKERS YOU WILL USE FIRST. THIS GOING TO BE A LONG CONVERSATION.
-------------------- EBR Posts: 32 | From: PUERTO RICO ? Email Us:Autofile@TheAutophile.com | Registered: Oct 2009
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