Starting help DSP EQ on B&C DE-750
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Category: General
Forum Name: General Forum
Forum Description: Open Discussion / Questions
URL: https://forum.speakerplans.com/forum_posts.asp?TID=105950
Printed Date: 16 April 2024 at 11:06am
Software Version: Web Wiz Forums 12.06 - https://www.webwizforums.com
Topic: Starting help DSP EQ on B&C DE-750
Posted By: serioussound
Subject: Starting help DSP EQ on B&C DE-750
Date Posted: 21 December 2020 at 6:53pm
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I have built some dual 15" + 2" cabs around RCF L15P540 and B&C DE-750 on JBL 2380 horns. As I understand B&C DE-750 was a pretty common driver some years ago. I found some DSP/EQ settings for Yorkville TX4 cabs which use 1 B&C 15" with 4" coil and a B&C DE-750. In the presets for this cabs there is 4,5 db difference in gain between HF and LF. Also there is a narrow EQ -2,5db on the 15" on 290 hz. On the 2" there is a -10 db at 3400hz with a Q of 2 and a -6 db at 1100hz with a Q of 2.71. On this preset there is a gap in crossover at 770 for the 15" and 1100 on the 2" driver. My questions are: 1. What are you guys experience with the B&C DE-750 driver what EQ settings are a good start I want to keep it as simple as possible? And is the gap in crossover between 15" and 2" a good solution? 2. Are the above setting form Yorkville TX4 normal setting for a B&C DE-750 driver? 3. In my cabs are dual 15" instead of single 15" how will this probably effect the gain setting between HF and LF in my cabs? |
Replies:
Posted By: Conanski
Date Posted: 21 December 2020 at 8:24pm
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You really need to get your speakers in front of a test system so you can see what the systems raw response looks like and also learn what the response you find pleasing looks like. The horn the driver is mounted on will have an effect on the corrective processing necessary, and limiter settings will be specific to the processor and amps you are using. That said here is what I have dialed in for my double15+2 speakers using Eminence KappaPro15s , B&C DE750s and a DCX2496. The mids( wired in parallel) Gain: 0dB(no boost or cut) Crossover: LR24 at 80hz and 1khz EQ: -4.6dB Q3.5 @116hz, -6.1dB Q3.5 @228hz Delay: 0.14ms Polarity: Normal The CD Gain: -6dB Crossover: LR24 1khz EQ: +6dB High shelf at 8.5khz, -3dB Q5 @3.18khz Delay: Off Polarity: Inverted This processing does not bring the topend of the CDs response up flat it still has a gentle rolloff, but I find ruler flat response at high frequencies to be overly bright.  |
Posted By: serioussound
Date Posted: 21 December 2020 at 8:52pm
| Thanks are the drivers you hav B&C DE-750? |
Posted By: Conanski
Date Posted: 21 December 2020 at 9:04pm
| Yes...I had a typo in my post/ |
Posted By: serioussound
Date Posted: 21 December 2020 at 9:11pm
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Your eq setting are very different from Yorkvilles on the B&C comps. Is it usually like this that you can have really different ways of eqing the comp to sound good?
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Posted By: Conanski
Date Posted: 22 December 2020 at 5:11am
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Yes, everything matters with processing, the horn the drivers are mounted on and the other drivers it is paired with as well as the listeners preferences. I like the results I got with this setup and everybody that hears it says it's smooth and crisp, and that is what matters. These drivers have a reputation for smooth output so the best thing to do it power them up and have a listen, you should get somewhat decent sound with nothing more than the high shelf boost and level matching with the 15s. Of course the only way to really dial it in is with a measurement system, it is instructive to just set some EQ and see what it does to the response, you will learn a lot about your gear and what you like to hear by just messing around with it for a few hours.
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Posted By: bob4
Date Posted: 23 December 2020 at 1:18pm
Start your own thread.... your question is a bit hard to understand too |
supercell1 wrote:
Posted By: serioussound
Date Posted: 13 September 2021 at 5:19pm
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Sorry to bring this up again. What horns did you use in this setup? |
Posted By: serioussound
Date Posted: 13 September 2021 at 7:39pm
I need to ask what horns are you using for the cabs you have? I dont know what to do I want to have a flexible system and I have 4 cabs with B&C DE750 + Dual 18sound 15NMB420. My problem is sometimes I want to use 1 cab a side for smaller events and sometimes 2 cabs a side for larger events. Problem is if I should go with 60x40 or 90x60 horns? 2 cabs a side 60x40 is best and when using 1 cab a side 90x60 is best. What would you do? I have lots of B&C DE 750 laying around one option is to have seperate HF sections with 60 respectively 90 horns and change them out depending on situation but does look strange I think…
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Posted By: toastyghost
Date Posted: 13 September 2021 at 11:09pm
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Just bear in mind that > 90% of people listen off axis, so making a beautiful flat response on axis is solving problems for a tiny portion of the intended audience. If you’re serious about doing it right, look up how to make quasi-anechoic measurements (audiosciencereview forums have a great guide) and use Vituixcad or similar to simulate baffle step and crossover elements. |
Posted By: Conanski
Date Posted: 14 September 2021 at 2:08am
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Posted By: serioussound
Date Posted: 14 September 2021 at 9:46am
I have both JBL 2380 90x60 and JBL 2385 60x40 laying around. What would you choose. Sometimes I want to play outside with 2 cabs per side but most of time 1 cab a side is fine. Also my feeling ia I need alot of sub to keep upp with 2 of this tops a side..
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Posted By: toastyghost
Date Posted: 14 September 2021 at 10:48am
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Are you designing a new box for these drivers? You could design it with a swappable HF baffle, and change the horns (and DSP preset) as needed. It would be twice the work to develop processing for consistent coverage with both types of horn, of course. There’s always a price to pay for flexibility. As has already been mentioned, you’re going to need to measure the drivers on the horns and in the box, on and off axis to determine the best crossover and EQ filters, slopes and such. If you’re wanting the boxes to use a passive crossover, then you can design this using VituixCAD simulations, and see the results on the on and off axis response. |
Posted By: serioussound
Date Posted: 14 September 2021 at 11:16am
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I already have the cabs and both horns fits in the cabs… Im kind of a newbie with measuring frequency response and so on. But the cabs to my ears sounds nice with conanskis settings but my issue now is what horns to use probaly its a compromise either way I go for 90 or 60 horns?
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Posted By: snowflake
Date Posted: 14 September 2021 at 12:33pm
crossing at 1kHz the 15s are going to have started beaming a bit and have a narrowed dispersion. so I would go with the 60deg horn on the basis you will be able to get a more constant directivity through the crossover region, which is also the vocal range in this case.
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Posted By: Conanski
Date Posted: 14 September 2021 at 1:22pm
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