Yes exactly, to get close spacing. I still have more of the laser cut plates, lol.
@Tenson How did you separate the front faceplates from the DMB-As? They're usually glued to the flange and don't want to come off easily.
When did you buy those mids ie production date? Were the mounting holes in the motor drilled evenly?
I've had to offset some of the holes in the enclosure to line up exactly with the DMB-A flanges because they were cast unevenly in the flanges. I filed open the flange holes to accommodate this issue.
BTW, very nice cabinetry on your speakers. Do you have a cad drawing for the front plates you would possibly want to share with us?
When did you buy those mids ie production date? Were the mounting holes in the motor drilled evenly?
I've had to offset some of the holes in the enclosure to line up exactly with the DMB-A flanges because they were cast unevenly in the flanges. I filed open the flange holes to accommodate this issue.
BTW, very nice cabinetry on your speakers. Do you have a cad drawing for the front plates you would possibly want to share with us?
I do not recall if the DMB-A had a glued face plate but the XT25SC50 certainly did. I cut the exposed glue line with a knife and then heated the back side of face plate gently with a hair-dryer until it pulled off.
My DMB-A are from around 2016. I never used the supplied face plate so I don't know how well the holes were drilled / cast but the motor screw holes align well enough with the face plate I made.
Here is the face plate file as DXF and DWG.
I've got the full cabinet plans and Xover I could share I guess. It'll take some work though to prep for sharing so please only ask if you really want it!
Actually I'd like to sell the speakers if anyone in the UK wants them for a not stupid price?
My DMB-A are from around 2016. I never used the supplied face plate so I don't know how well the holes were drilled / cast but the motor screw holes align well enough with the face plate I made.
Here is the face plate file as DXF and DWG.
I've got the full cabinet plans and Xover I could share I guess. It'll take some work though to prep for sharing so please only ask if you really want it!
Actually I'd like to sell the speakers if anyone in the UK wants them for a not stupid price?
Last edited:
Ok, so your DMB-As are an earlier batch, which IMO were better than the current version I recently tried. The consistency issue with these budget drivers is significant enough to warrant the purchase of extra units to get decent matching of a stereo pair.
Don't worry about sharing the design if its too much of a burden. Thanks for sharing what you already have.
Don't worry about sharing the design if its too much of a burden. Thanks for sharing what you already have.
I see the DMB-A mentioned quite often but has anyone tried the newer DM-7600? I would really like to hear some real life experience with this mid driver.
https://www.aliexpress.com/item/1005004670052234.html
https://www.aliexpress.com/item/1005004670052234.html
Hi @wolf_teeth , any link to the thread talking about the DM-7600? Went over to MAC forum and couldn't find anything related to DM-7600 when I did a search.
I'd love to see some tests by a comparable source such as @HiFiCompass 😀 The DM7600 looks like a beast.
P.S. I DO NOT recommend buying drivers on AliExpress they are sometimes quality rejects.
P.S. I DO NOT recommend buying drivers on AliExpress they are sometimes quality rejects.
Last edited:
The 7500 is starting to garnish some favor…..Johnny Richards over at the PE TT built a 3 way with it fairly recently and loves the sound…….one of those sounds better than it measures kinda things and for a midrange, to my mind it makes sense…..like an ugly puppy peering through a pile of pillows or funky colored jelly inside of an otherwise delicious donut.
If you understand Chinese or someone can help you with it, you can actually order it from Taobao. There are official stores there that sell HiVi stuff. Also, there is no mention of the Xmax of this driver even on the official stores.
Member
Joined 2003
I can say for certain, the D7608 measurements at Hificompass were completed open baffle, without rear chamber.
My mistake, as I did not know the 7500/7600 were different drivers and that HiVi had more than one 3" dome in their lineup. It's the 7500 as mayhem stated.
The Hivi 7500 is the earlier version of the 7600. The problem here again is consistency. Some batches from different dates are better than others. If committing to use them, I'd recommend buying extras and cherry picking pairs, one to use and the other for future failures.
You should never believe any data hivi publishes because of how they measure and test. The graphs are overly smoothed with large scaling, making them look more attractive at first glance.
You should never believe any data hivi publishes because of how they measure and test. The graphs are overly smoothed with large scaling, making them look more attractive at first glance.
The xmax spec isn't a reliable measurement to determine linear operation of an overhung VC driver with a proportionatly large motor. The magnetic field flux symmetry (not readily visible to the naked eye) can and will throw it off.
If you don't have Klippel measurements for BL symmetry, its hard to determine by how much distortion will increase with further VC excursion. Only the THD measurement along with its individual component proportions can reveal overall motor linearity.
Even if Hivi would claim a specific number, I'd be suspicious of its accuracy based on how blurred their other claimed specs are. Based on my findings when looking at the DMB-A internal build, I didn't see more than a total of 1mm VC winding overhang when comparing winding height to upper pole plate thickness.
There was also some discrepancy in the winding height centering, specifically a negative VC offset (inwards towards the motor). A slight negative coil offset is common on dome drivers, but its not good if it varies alot. This will cause large TSP and THD variances at different SPLs.
Do we know it is an overhung design? Kind of uncommon for a midrange dome I'd think? But surely suggests a significant xmax.
I'm mostly interested to compare the HiVi 7500 with the Tangband 3".
I believe the differences between the DM7500 and DM7600 is the latter has a waveguide faceplate. Are there further changes?
I also would hope on a driver of this price HiVi does better quality control... but we won't know that until many units are sold!
I'm mostly interested to compare the HiVi 7500 with the Tangband 3".
I believe the differences between the DM7500 and DM7600 is the latter has a waveguide faceplate. Are there further changes?
I also would hope on a driver of this price HiVi does better quality control... but we won't know that until many units are sold!
Well the best way to know if something is consistent is to order at least 2 and test yourself. Thats honestly the only trustworthy way to know having someone in a trusted circle of people test it. I wouldn't trust anything Hivi puts in a soec sheet based on several previous experiences.
Most mid domes aren't underhung... at least not the ones I've taken apart and I can tell you I do take most drivers apart which facilitate it. Sometimes that happens without my involvement ie shipping damage.
The earlier tang band 1558 (SE version) mid dome was very good. I liked that one alot and it performed on par with the D76 Dynaudio mid dome, maybe even a bit better. It was the poor man's ACT. The new SH version isn't nearly as good.
Most mid domes aren't underhung... at least not the ones I've taken apart and I can tell you I do take most drivers apart which facilitate it. Sometimes that happens without my involvement ie shipping damage.
The earlier tang band 1558 (SE version) mid dome was very good. I liked that one alot and it performed on par with the D76 Dynaudio mid dome, maybe even a bit better. It was the poor man's ACT. The new SH version isn't nearly as good.
I have not checked which domes are underhung or overhung, I just assumed (a**-u-me) since the excursion requirement and power handling is limited while linearity is prized. I'm not surpised the Hi-Vi DMB-A is overhung since it appears to borrow the motor from their mid-bass drivers.