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05-04-2011, 11:05 AM
| | Registered User | | Join Date: Aug 2007 Location: Waterford, MI | | | Changing crossover point
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Has anyone messed with changing the tweeter's crossover point in their bass cabs, more specifically a Goliath III? It's a well known fact that these things are harsh and clicky...and it mostly has to do with the crossover not being correct. It's either too low because the crossover is really only a high-pass filter to the tweeter while keeping the woofers full range and @ 5k the tweeter is probably overlapping to low into the speakers usable frequency range thus causing the harsh tone. Or, it's set too high. With 10" woofers not having a very extended upper frequency usability with some even rolling off as early as 800Hz having a true crossover sending only 5k+ only to the tweeter and everything below that only to the woofers it might be set to high leaving a "gap" in the response curve also making the tweeter sound harsh. Thoughts? |
05-04-2011, 01:02 PM
| | | | I'll go low tech here.
If you get some small chunks of acoustic phone and hang them in front of the tweeter you can adjust the sound. Sometimes a piece of felt to really cut the sound.
There's even a foam donut looking thing you can hang in front of low freq drivers to give them better dispersions of highs.
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05-07-2011, 08:10 AM
| | Registered User | | Join Date: Aug 2007 Location: Waterford, MI | | | Does anyone know what kind of wattage the crossover runs? I found nice pre-assembled crossover networks at a few speaker parts dealers but don't know what kind of wattage to get. |
05-07-2011, 01:45 PM
| | Registered User | | Join Date: Nov 2003 Location: Indianapolis, IN | | | I've yet to hear a multi-way cabinet that I liked (save for Acme). Just run the woofers full range and forget the horn.
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05-07-2011, 03:07 PM
| | Registered User | | Join Date: Aug 2007 Location: Waterford, MI | | Quote: |
Originally Posted by TimmyP I've yet to hear a multi-way cabinet that I liked (save for Acme). Just run the woofers full range and forget the horn. | Not even the accugroove cabinets with seperate woofer, midrange driver and tweeters? I figured that would be the closest sounding thing to an actual hi-fi FOH system. |
05-07-2011, 03:22 PM
| | Registered User | | Join Date: Aug 2007 Location: Waterford, MI | | | Maybe using co-ax drivers with the horn to make up the frequency "gap"? |
05-08-2011, 09:10 PM
| | Registered User | | Join Date: Aug 2007 Location: Waterford, MI | | | For anyone who's curious about a "conclusion" to this...after reading many spec sheets on pro level loudspeakers (EAW, Yamaha, JBL, etc) most 2 way setups with a 10" driver have the tweeter crossed over @ 2kHz. I also noticed after looking at speaker companies (like Eminence and a few others) that most 10" bass speaker's usable frequency range goes from the 40-45Hz area to the 2kHz area. That being said I believe with a 4x10 bass cab (SWR GIII in my case) crossing the tweeter over @ 2kHz will give the cab more full spectrum, "studio monitor" type sound reproduction considering the usable frequency range of a 10" driver. So once I find the correct wattage the crossover needs to be for my cab(s) I will be installing a 2kHz crossover in at least one of my cabs.
Last edited by carvinbassplyr : 05-08-2011 at 09:14 PM.
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05-08-2011, 10:37 PM
| | | | plenty of bass cabs allow you to switch the crossover point of the horn, like the boogies, where 3k is bright and cutting (harsh, even), while 5K creates more of a smooth "sheen". they all usually keep the drivers full-range, though.
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Last edited by walterw : 05-08-2011 at 10:41 PM.
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05-08-2011, 10:52 PM
|  | keepin' the beat since the 60's | | Join Date: Dec 2007 Location: Studio City, SoCal, USA | | | Whatever you do, I would leave the woofer full range. Your simple high pass is likely just a blocking cap that doesn't muck with the sound too much. A full crossover with caps and inductors can cause a lot of other phase problems and must also be able to safely handle the full woofer power continuously.
In my experience, harshness is the driver itself, not the crossover. You might just turn it off.
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05-09-2011, 07:31 AM
| | Registered User | | Join Date: Aug 2007 Location: Waterford, MI | | Quote: |
Originally Posted by Gio S Whatever you do, I would leave the woofer full range. Your simple high pass is likely just a blocking cap that doesn't muck with the sound too much. A full crossover with caps and inductors can cause a lot of other phase problems and must also be able to safely handle the full woofer power continuously.
In my experience, harshness is the driver itself, not the crossover. You might just turn it off. | After talking to a few speaker builders and the techs @ parts express...I decided to do a sine wave test with tweeter on and off since I was informed that instrument drivers vs "woofers" are voiced quite differently and can respond up to 3.5k and even up 6k. Well without the tweeter on the drivers responded pretty strong up to around 5k but then the volume started to drop off pretty severely. With the tweeter on there was a spike in volume @ 4k which tapered back down around 6k meaning the tweeter is overlaping too much with the drivers. So if I shift the highpass filter to 6k instead of 5k it should soften that hotspot therefore "softening" up the tweeter. I may have to set it even higher but I think 6k is a good starting point.
Last edited by carvinbassplyr : 05-09-2011 at 04:55 PM.
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