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MT121 comp driver probs

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fatfreddiescat View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote fatfreddiescat Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2021 at 9:20am
Looks like a normal response for a constanrt directivity waveguide, here's a link to a previous discussion that cove rs this topic:

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Post Options Post Options   Thanks (0) Thanks(0)   Quote biggins Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2021 at 7:37am
OMG, trying to get images to display. Faaark.... Confused


Edited by biggins - 25 April 2021 at 8:09am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote biggins Quote  Post ReplyReply Direct Link To This Post Posted: 25 April 2021 at 7:25am
Hi there,

I'm hoping someone can help me troubleshoot an issue that i am having with some comp drivers in MT121.

Originally, I had the cabs loaded with P-Audio BMD750 and was seeing an issue where the audio dropped off steeply arund 10Khz. I thought the BMD-750s were crapping out above 10k because they are 2" comp drivers and apparently that is A Thing.

To try and rectify the situation, I picked up some BMS 4555. However when I measure the new comp drivers driver using REW I am still seeing a pretty steep drop off around 10K.

* Measurement of BMS 4555 (laptop > soundcard > amplifier > BMS4555): 

 


* Measurement of BMS 4555 (laptop > soundcard > processing > amplifier > BMS4555)
processing is just some EQ to smooth stuff out

  

~~~~~~~~~~~~~~~~~~~~~~~~~~
 
My expectation (hope) was that the 1.5" comp drivers would behave better above 10Khz but that's not what i am seeing. The comp drivers are attached to a P-Audio P2723 2" horn (with 1.5" -> 2" adapter).

So, I'm a little stuck as to how to proceed. I'm wondering if the issue is being caused by the P2723 horn. Maybe i f'ed up and bought the wrong horn and i need to buy different horns? However, before I spend more $$$ on new horns/shipping, I wanted to get a 2nd opinion on the above issue cos maybe I am missing something or maybe there is some more troubleshooting i can do..

If it is the horn, can anyone give an opinion on the BMS2230 horn or the B&C ME60 paired with the BMS4555? Am also open to other suggests.

Thanks in advance
B

Links:
Comp Driver: http://www.bmsspeakers.com/index.php?id=bms_4555
P-Audio Horn: http://www.paudiothailand.com/pac/index.cfm/products/product/?id=566

BMS 2230 horn: https://www.thomann.de/intl/bms_2230.htm
B&C ME60 horn: https://www.thomann.de/intl/bc_me_60.htm


Edited by biggins - 25 April 2021 at 8:08am
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