As I have two pairs of these drivers for surround loudspeakers purchased some years ago I was looking what others have done with these 15 euro fullranges.
Now I think about what to do with them (no surround sound system at the moment).
Here information I gathered on this one
TQWT
http://leoandfanny.bplaced.net/loudspeaker/joe.html
https://zelfbouwaudio.nl/forum/viewtopic.php?p=1777196&hilit=senon#p1777196
Open baffle
https://zelfbouwaudio.nl/forum/viewtopic.php?p=1569529&hilit=rockwood#p1569529
specs speaker:
Senon/ Rockwood DY - 811U
Qts=1.7
fs=95Hz
Vas=9.8 ltr
Qms=5.72
Qes=2.42
Re=7.0ohm |geschat
Le=0.31mH |geschat
mms=17.4g
BL =5.47Tm
sD = 0.0208; |Membraam oppervlak m2
Spl: 87 db toegevoegd
Now I think about what to do with them (no surround sound system at the moment).
Here information I gathered on this one
TQWT
http://leoandfanny.bplaced.net/loudspeaker/joe.html
https://zelfbouwaudio.nl/forum/viewtopic.php?p=1777196&hilit=senon#p1777196
Open baffle
https://zelfbouwaudio.nl/forum/viewtopic.php?p=1569529&hilit=rockwood#p1569529
specs speaker:
Senon/ Rockwood DY - 811U
Qts=1.7
fs=95Hz
Vas=9.8 ltr
Qms=5.72
Qes=2.42
Re=7.0ohm |geschat
Le=0.31mH |geschat
mms=17.4g
BL =5.47Tm
sD = 0.0208; |Membraam oppervlak m2
Spl: 87 db toegevoegd
Already one sided aluminized some years ago
Don't know how they manage to have this Q factor with such a big magnet
its suspended stiff so its not a long cone travel
it can't have a 50mm voice coil either if I look on the size of the dustcap
original
in my surround sound system it would have been linearized by Denon Audyssey microphone measurement so I did not take care about Q factor or FS.
Don't know how they manage to have this Q factor with such a big magnet
its suspended stiff so its not a long cone travel
it can't have a 50mm voice coil either if I look on the size of the dustcap
original
in my surround sound system it would have been linearized by Denon Audyssey microphone measurement so I did not take care about Q factor or FS.
Attachments
maybe there are two types of them to be available one has a bigger whizzer and maybe other magnet and parameters
At rumoh NL its got a big whizzer
https://www.rumoh.eu/speakers/fullr...n-dy-811u-fullrange-speaker?number=sen-DY811U
at Pollin its got the small whizzer
https://www.pollin.at/p/rockwood-pa...MI3Y3TruyVjAMVsJWDBx00nx5PEAQYASABEgIcW_D_BwE
I think at rumoh nederlands they took a foto of the 10 inch driver
https://www.rumoh.eu/speakers/fullr...n-dy-811u-fullrange-speaker?number=sen-DY811U
at Pollin its got the small whizzer
https://www.pollin.at/p/rockwood-pa...MI3Y3TruyVjAMVsJWDBx00nx5PEAQYASABEgIcW_D_BwE
I think at rumoh nederlands they took a foto of the 10 inch driver
related, coating speakers/damping-
https://ln271828.net/budget_3-way.htm
Wharfedale woofer
HiVi T20
PE 299-4212 mid with a plastic chrome dustcap
https://www.parts-express.com/03-0510-Speaker-299-4212?quantity=1
"
FIGURE 6
Now, we come to the solution of the aforementioned response peaks and dips. Note that two of these curves have no such peaks and dips and that has nothing to do with the gating process which removes room reflections by some 95% above 300hz.
The RED is midrange by itself without filters. The green is that of the midrange and tweeter only, with...
Wharfedale woofer
HiVi T20
PE 299-4212 mid with a plastic chrome dustcap
https://www.parts-express.com/03-0510-Speaker-299-4212?quantity=1
"
FIGURE 6
Now, we come to the solution of the aforementioned response peaks and dips. Note that two of these curves have no such peaks and dips and that has nothing to do with the gating process which removes room reflections by some 95% above 300hz.
The RED is midrange by itself without filters. The green is that of the midrange and tweeter only, with...
Last edited:
Google Translate
https://translate.google.com/?sl=auto&tl=en&op=translate
for inspiration-
8" fullrange open baffle speakers:
Visaton BG20 & 2 Eminence Alpha 15A-8 ohm (woofers in Series)
Open Baffle two Eminence Alpha 15A & Visaton BG20, Simple crossover.
PAP style
https://linhkienloadai-vn.translate...uto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp
from the video- crossover 9 min & sound demo 10:30 min
--
Plott's SB Acoustics SB20FRPC30-8
Later in the thread TangBand W8-2145.
https://www.diyaudio.com/community/threads/my-open-baffle-journey.394806/
post#117
SB Acoustics SB20FRPC30-8 crossover
--
Lil Audio F-8
https://linhkienloadai.vn/blogs/du-...n-ho-3-way-gom-2x-eminence-alpha-15a-mid-20cm
========================
10"
PAP Style
10" Monacor Stage Line Coaxial. Monacor 15" woofers ?
https://theartofsound.net/forum/showthread.php?54189-My-personal-Open-Baffle-speaker-project
---
Lil Crystal-10
--https://linhkienloadai.vn/blogs/du-an-loa/du-an-loa-van-ho-lii-audio-w-15-x-2-va-lii-audio-crystal-lap-theo-cau
https://translate.google.com/?sl=auto&tl=en&op=translate
for inspiration-
8" fullrange open baffle speakers:
Visaton BG20 & 2 Eminence Alpha 15A-8 ohm (woofers in Series)
Open Baffle two Eminence Alpha 15A & Visaton BG20, Simple crossover.
PAP style
https://linhkienloadai-vn.translate...uto&_x_tr_tl=en&_x_tr_hl=en-US&_x_tr_pto=wapp
from the video- crossover 9 min & sound demo 10:30 min
--
Plott's SB Acoustics SB20FRPC30-8
Later in the thread TangBand W8-2145.
https://www.diyaudio.com/community/threads/my-open-baffle-journey.394806/
post#117
SB Acoustics SB20FRPC30-8 crossover
--
Lil Audio F-8
https://linhkienloadai.vn/blogs/du-...n-ho-3-way-gom-2x-eminence-alpha-15a-mid-20cm
========================
10"
PAP Style
10" Monacor Stage Line Coaxial. Monacor 15" woofers ?
https://theartofsound.net/forum/showthread.php?54189-My-personal-Open-Baffle-speaker-project
---
Lil Crystal-10
--https://linhkienloadai.vn/blogs/du-an-loa/du-an-loa-van-ho-lii-audio-w-15-x-2-va-lii-audio-crystal-lap-theo-cau
I will try to measure the Rockwood DY811u driver in an enclosure.
Still cannot believe its got such a high Q (1.7) although it has a decent looking magnet.
If the Q factor is as high as stated: one idea is to match the mid frequencies to the high efficiency in the bass.
in a normal 35 liter reflex box tuned to 80 hz WinISD put out this frequency response (+10db at 116hz)
Still cannot believe its got such a high Q (1.7) although it has a decent looking magnet.
If the Q factor is as high as stated: one idea is to match the mid frequencies to the high efficiency in the bass.
in a normal 35 liter reflex box tuned to 80 hz WinISD put out this frequency response (+10db at 116hz)
Watching at a graph from Bill Fitz Maurice (bfm) with designs from his wedgehorns (short front horns for the mids) the frequencies above 150hz could be raised by ten decibels. Instead of using EQ to pad the bump in the bass down. The bump in the bass can be adjusted and raised in frequency by reducing the volume of the box.
the wedgehorn is a bit complicated to be built but maybe a simpler one will give some gain of 6db instead of ten decibels
the wedgehorn is a bit complicated to be built but maybe a simpler one will give some gain of 6db instead of ten decibels
