Honestly the PA165 looks more attractive to me, but the MB620 has power handling going for it, for those that need to blast 200W of midrange...not for home use I suppose. These MB drivers have no motor venting whatsoever, so air compression under the dust cap is definitely there, I can only assume the cause of the problem fairly low in frequency at 300Hz. It's about as basic as you can get for driver construction.
@dcibel said:
Honestly the PA165 looks more attractive to me, but the MB620 has power handling going for it, for those that need to blast 200W of midrange...not for home use I suppose. These MB drivers have no motor venting whatsoever, so air compression under the dust cap is definitely there, I can only assume the cause of the problem fairly low in frequency at 300Hz. It's about as basic as you can get for driver construction.
It's the roll-off, mild break-up and sensitivity that is most attractive to me.
I don't think I would drive them hard enough to be concerned with venting but your comments are well considered.
Peak sensitivity, I recall there were some other cheap-o Dayton drivers released not that long ago that used the same metric for sensitivity. Marketing department must have control of the data sheets now . It’s funny, if Dayton used peak sensitivity for the old RS series, RS180 becomes a 99dB sensitivity driver!
They make it up not only because they can, but because they have to. There's no well defined standard for specifying sensitivity, so manufacturers can define their own standard, it's unfortunate that Dayton hasn't a well defined standard of their own so the way sensitivity is specified varies from driver to driver. However, other vague specs such as overall impedance, Le, and others are sort of meaningless when you have a complete plot of the impedance and infinite baffle SPL at a standard 2.83V/1m provided.
FWIW I used to own some Infinity subwoofers that specified sensitivity as peak sensitivity in a poorly tuned box, so a 12" car audio sub was specified with >90dB sensitivity. It definitely made some sales with the car audio crowd who unknowingly just compare the numbers directly and decide that these Infinity subs are better because of higher sensitivity.
For myself, the hope would be that manufacturers provide enough useful information so that people can make an educated purchase decision, then once you have the drivers in hand, throw away the datasheet and make your own data set for the drivers you have.
Yeah, large flange is a bit of a turn off, as is the price. But it looks like it can cross really low for a planar. If it sounds as good as its smaller brother, the RT1.3WE, it isn't that bad of a deal.
Here is an old PETT thread discussing this driver. I'm tempted to buy a pair and cross them at 1.7kHz (per the range spec noted above), but it looks like this might not be a good idea. Eric, can you remember where you crossed these on your speakers?
Yeah, I think I'm around 2Kish in those speakers. I run the 8 full range with a notch filter. I also know they're limitation volume wise. They'll get plenty loud, but your not gonna have a block party with them.
Running the woofer full range with a notch filter > excellent, imo, with the right driver.
I initially tried that with my beyma 5 coax’s - unfortunately not going to happen with that driver.
Comments
Mark told me that they can't get the cores.
Shopping for options. Many are cost prohibitive.
DSP/amps are in our future if we can get the boards . . .
The PE website still sucks. Been awhile since I whined about that.
Remember when they invited web site feedback? Did not go well, or last long!
Yeah, not enough reach around for old douchebag Stahl, I guess.
What were you looking for?
Yay! --> https://www.parts-express.com/pedocs/manuals/295-635--dayton-audio-mb620-8-spec-sheet.pdf
Really Cool (except for the notch needed @ 3.2KHz) --> https://www.parts-express.com/pedocs/manuals/295-637--dayton-audio-mb1025-8-spec-sheet.pdf
Not Cool --> https://www.parts-express.com/pedocs/manuals/295-636--dayton-audio-mb820-8-spec-sheet.pdf
Bet they all go up in price once someone publishes an XO for them . . .
I like the 6.5 inch
https://www.parts-express.com/Dayton-Audio-MB620-8-6.5-Professional-High-Power-Midbass-Driver-8-Ohm-295-635
Honestly the PA165 looks more attractive to me, but the MB620 has power handling going for it, for those that need to blast 200W of midrange...not for home use I suppose. These MB drivers have no motor venting whatsoever, so air compression under the dust cap is definitely there, I can only assume the cause of the problem fairly low in frequency at 300Hz. It's about as basic as you can get for driver construction.
+1
It's the roll-off, mild break-up and sensitivity that is most attractive to me.
I don't think I would drive them hard enough to be concerned with venting but your comments are well considered.
It's strange that they claim 94dB sensitivity, when the graph pretty much shows about 90dB
Peak sensitivity, I recall there were some other cheap-o Dayton drivers released not that long ago that used the same metric for sensitivity. Marketing department must have control of the data sheets now
. It’s funny, if Dayton used peak sensitivity for the old RS series, RS180 becomes a 99dB sensitivity driver!
I think they just make it up as they go since very few of their ratings match the SPL/FR curves they publish.
They make it up not only because they can, but because they have to. There's no well defined standard for specifying sensitivity, so manufacturers can define their own standard, it's unfortunate that Dayton hasn't a well defined standard of their own so the way sensitivity is specified varies from driver to driver. However, other vague specs such as overall impedance, Le, and others are sort of meaningless when you have a complete plot of the impedance and infinite baffle SPL at a standard 2.83V/1m provided.
FWIW I used to own some Infinity subwoofers that specified sensitivity as peak sensitivity in a poorly tuned box, so a 12" car audio sub was specified with >90dB sensitivity. It definitely made some sales with the car audio crowd who unknowingly just compare the numbers directly and decide that these Infinity subs are better because of higher sensitivity.
For myself, the hope would be that manufacturers provide enough useful information so that people can make an educated purchase decision, then once you have the drivers in hand, throw away the datasheet and make your own data set for the drivers you have.
Good news: Popular planar is DOTD.
Not so good news: Is this a deal anymore?
Ahhh, my first deviation from soft dome tweeters. Seems like they were that same price back around 2010 when I bought them. Still a wonderful unit👍🏼
That flange is huge! 177mm. Almost as big as a 7" woofer.
Ah, I see now that I was thinking of the HiVi RT1.3WE, not this one. Never mind.
Yeah, large flange is a bit of a turn off, as is the price. But it looks like it can cross really low for a planar. If it sounds as good as its smaller brother, the RT1.3WE, it isn't that bad of a deal.
Second Skin Audio is having a 15% off sale. They make sound deadening, blocking and absorbing products. https://secondskinaudio.com/
Ron
Here is an old PETT thread discussing this driver. I'm tempted to buy a pair and cross them at 1.7kHz (per the range spec noted above), but it looks like this might not be a good idea. Eric, can you remember where you crossed these on your speakers?
https://techtalk.parts-express.com/forum/tech-talk-forum/44568-how-does-the-hivi-rt2c-compare-to-other-planars
I would not go below 2.5k with these. I did a MTM design with F6 and it did well.
Yes it's huge, yes it's efficient, no it can't play low.
InDIYana Event Website
Yeah, I think I'm around 2Kish in those speakers. I run the 8 full range with a notch filter. I also know they're limitation volume wise. They'll get plenty loud, but your not gonna have a block party with them.
Running the woofer full range with a notch filter > excellent, imo, with the right driver.
I initially tried that with my beyma 5 coax’s - unfortunately not going to happen with that driver.
Aerogel FTW!!
Lol what the fuck?
Had to scroll way down.
Many of us tried to help PE with web issues. No good resulted.
https://www.amazon.com/gp/product/B00ENMK1DW?tag=slickdeals09-20&ascsubtag=bcade724e13c11ecb39f02ced187688b0INT
Great headphones for the money.