mopardave
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Posts posted by mopardave
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1 hour ago, kevinmi said:
I've got a pair of DCM 50's I'm not using right now if you want to give them a try.
Hahaha, you always have something Kevin. What else do you have? The DCM50 won’t fit in my cabinets with my current horns. What your opinion between the 50’s and bc85 drivers sonically to your ear?
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5 hours ago, TubesGlo said:
Do you have them toed in?
Yes, toed in pointing at my nose. They sound very good.
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16 minutes ago, Crankysoldermeister said:
Why not try one of the Radian drivers with Beryllium diaphragms. Hey, it’s only money.
Dean
I know nothing about those til now. How do they sound compared to the B&C stuff? I looked at the specs and 3 drivers with 2" dia and seems only spec that different is the weight and the price. All 500hz to 20,000k.
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On 12/10/2021 at 9:25 PM, geoff. said:
@mopardave, your findings are correct and @TubesGlo is bang on. It’s considered nearfield listening. And the bass seems to just hit right in addition to the imaging.
I think it’s called the “golden ratio”, an equilateral triangle with the speakers and your listening position. The walls are also part of the equation.
The further your room, or significant other, allows you to put the speakers out into the room, away from the walls, up to a point, the deeper the soundstage will go as well the improvement in imaging.
I call it the “air chair” and smile when I see my kids gravitate towards it when their favourite tunes are playing.
You are absolutely correct. I pulled the cabinets out from the back wall 2' and the sound stage has improved. The drum set is now moved to the rear wall as it should. Sounds more enjoyable for sure. They are still 9' apart and i moved back further away from the cabinets as well about 13-14'. Sounds great anywhere in between 10' to 14'. Thanks
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Thanks for the linc.
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Am I mistaken or did Crites used to sale the cabinets empty for about $600? I don't see them listed on the Crites site. I have been thinking about putting together another pair of cornscala using different components and vineer.
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Just curious if anyone here has used both of these drivers. I would like to know your opinions in a 3way setup.
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40 minutes ago, mopardave said:
Ok, I’m gonna just that spec on my horn. Do you know if anyone is making the mumps horn used in the new CW 4 or something close. I would really like the build another set using those horns.
Another spec I found different between HL4750(ZXPC11x17.5) and the JBL M2380 is the length difference. The M2380 is 4.5” shorter than the HL4750. Would that create lower frequencies with the 4750, the longer horn or allow it to go lower?
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7 minutes ago, Deang said:
I don’t know that for sure. I’m real limited in that area. It’s just something DJK said to me and noticing patterns in spec sheets. Now, our first big clue is with the driver and horn we are all most familiar with. The PD5-VH is 110dB, but 107dB on the K-400.Ok, I’m gonna just that spec on my horn. Do you know if anyone is making the mumps horn used in the new CW 4 or something close. I would really like the build another set using those horns.
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10 minutes ago, Deang said:
That’s the advantage with that network. You can swap drivers and horns and just dial everything in again without having to change parts - as long as you’re using 400/6000 crossover points.
Ok, thanks
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40 minutes ago, Deang said:
You have different horns. A horn will change the stated sensitivity of the driver. Look at the difference in the Directivity Index on these horns. So, your numbers won’t necessarily align with his.
Aren’t you using an ALK? So, 12dB/octave on the midrange, which definitely sounds different than 6dB/octave.
Ok, I’m think I understand you now. A slotted horn has more air pressure or resistance causing more electrical resistance(ohm) in the driver?
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35 minutes ago, Deang said:
You have different horns. A horn will change the stated sensitivity of the driver. Look at the difference in the Directivity Index on these horns. So, your numbers won’t necessarily align with his.
Aren’t you using an ALK? So, 12dB/octave on the midrange, which definitely sounds different than 6dB/octave.
I’m using your ALK universal. So would it be an issue to try a different mid horn with my current components?
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6 minutes ago, Deang said:
@TubesGlo Okay, Michael says 12dB down is the correct setting (Tap 1). That would be for the D405 on the M2380. The Tap 2 setting is provided for those who prefer the midrange a bit more forward. He says it's possible he may have misunderstood your original email.
I checked the specs on my BC DE85 and says 108db spl not 107db like I read somewhere else, so I’m at 101db on my mid giving me 5db above the woofer spl. That is very close to the same as TubesGlo . I like how I can hear everything in the recordings, very articulate, but missing something. In your face vocals and mid bass punch seems to be missing with this open horn. I also noticed in the BC specs that this driver goes down to 500hz, the cross over and horn are capable of 400hz. Do you think that could be an issue?
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1 hour ago, TubesGlo said:
Not the best pic
I realize.
Ok, I’ll see if I can find one today. I really like the looks of your CS. Everything centered on the motorboard and the stain. Very nice. Mine started out as vertical CW home built. After 20 years I wanted something different. That’s why my components might look kind of odd with their placement. I’m now thinking seriously about trying a butt cheeks style mid horn just to see.
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1 hour ago, Deang said:
Is the 2380 like the HM4570 or the HL4570?
I’ve got 9 spec sheets up. JBL/Selenium doesn’t make it easy on you. All horns tested on different drivers, and those drivers on different horns.
No substitute for a microphone and a controlled environment.
I agree.
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10 minutes ago, Marvel said:
Different...
Here's pics of my hm4750 horns
Do you have any good pics of the M2380 horn?
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7 minutes ago, Marvel said:
Different...
Here's pics of my hm4750 horns
OH yeah, A lot different. Thanks for the great pics. I may be trying a different horn in my CS. I really miss the in your face mids that the old 600 horns had.
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1 hour ago, Deang said:
Is the HM4750 the same as the M2380 or different?
Their both 90x40 elephant butt cheek design, but the M2380's are a 500hz horn. HM4750 is 400hz. Both look the same to me.
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28 minutes ago, TubesGlo said:
Not sure about that, I haven't changed anything there. It just goes through the choke for low pass. This pic is how they were shipped and I followed Crites instruction recently to move the lead on tap 1 over to tap 2 while joining the terminals under the shrink wrap that connect the top capacitor to tap 5. I was asking for lower output from the squawker and Mike said this adjustment would put it at -12db vs -9db as in the picture.
That 3db attenuation brought everything in to balance for me, I like it much better.
Ok, I just looked it up. Your Crites 1526 spec is 97db spl, so with 12db of attenuation your running the mid 1 dB above your 110db spl mid driver. The drivers are playing close to the same output. Maybe I should try that setting on mine just to see. Our mid horns are different and mine being open is very laid back, I actually think my mid could be bumped just a notch higher output. I’m now at 4db above my woofer output.I will have to try both ways again now that the speakers are in a much bigger room.
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On 12/12/2021 at 5:48 PM, TubesGlo said:
This is how my crossovers were shipped.
Ok, what is the spl of your woofer? Just curious to how many db your running the mid above the woofer. Our combos are a bit different, but I’m just curious to your final setting.
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7 minutes ago, mopardave said:
You may be correct, the HL4750 does look to have a short slot. Here's are interesting thread with pics i found.
I bought my horns used from no.4, so the horn in his pics are mine. Just thought this horn thread could benefit anyone experimenting with horns in a Cornscala or whatever.
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9 hours ago, Marvel said:
This is true...
The HL has a narrower dispersion. The complaint about them, though, is the bolt hole patterns aren't consistent... mine were off and didn't line up with the driver holes.
Other than that, they work pretty well. 🙄
You may be correct, the HL4750 does look to have a short slot. Here's are interesting thread with pics i found.
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7 hours ago, Marvel said:
Nope, the Selenium has a bit if a slot shape in the throat. Not much, but is narrow and the widens back out rather quickly. I have a pair I got from Bob. I can post a picture straight on from the front, but it will be after I get home.
The HM4750 has a slot, the HL4750 does not. The HM is still a 400hz horn.
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4 hours ago, Deang said:
@mopardave You're fine. It's has a recommended crossover of 400Hz @ 12dB/octave -- which is what you have.
Thanks Deang
B&C DE85TN vs DCM50
in Technical/Restorations
Posted
Thinking about building another pair of cabinets. Looking for the perfect driver/horn combo and thinking a 510 or 603m might be what im looking for.