Copyright 2010 © Troels Gravesen
2-way floorstander from ScanSpeak 18WU/4741T00 + D3004/660000 or R3004/662000
Simply the best
"6+1" 2-way floorstander I've made yet.
Several months of work went into this design and it's so far the biggest ScanSpeak construction I've ever made. The Jenzen Illuminator features a stepped front panel to smooth midrange frequency response and to provide acoustical alignment of drivers for implementation of true LR2 crossovers. A simplified crossover can be realised with enhanced transparency and timbre quality.
Explore the world of ScanSpeak Illuminator series and a fancy crossover design providing smooth mid/tweeter integration. Don't expect earthquake levels from a 20 liter monitor but be prepared to enjoyable hours with your favorite music played at sensible levels. The best small "6+1" I've made so far. Not cheap, but far less than a similar commercial design would cost.
What makes a "studio monitor" different to any other "hifi" loudspeaker? Well, a true studio monitor is supposed to have a reasonably flat on-axis response combined with an even power response, allowing studio engineers to make the best possible mix of the recording before the final master. But shouldn't all speakers be suitable for this? I guess the term "studio monitor" was derived from well engineered speakers in contrast to most home audio speakers a few decades ago, when domestic speakers certainly was a mixed blessing of drivers balanced by a few measurements and or by the ear alone.
I had great expectations from this monitor due to the long-fibre paper pulp cone and I wasn't disapointed. Click heading or image to read more.
This project started with
Steen writing he'd acquired 2 x 26W/8861T00 bass drivers
and after the usual some 20+ mails, the top part of this
big 3-way became the 18W/8531G00 for mid and D2905/9900
for treble due to another diy'er giving up his
project. Not a bad choice! The 18W/8531G00 can go low in
a suitable top cabinet and possibly a simple crossover
could be implemented to mate bass and mid.
Sven Felsby: "This speaker was designed for maximal bass extension on a minimal footprint. As a result we end up with an expected sensitivity of 85dB/2.8V".
So far, so good.
I always liked the SP38/13 and seeing the large ScanSpeak D3806/8200 dome getting out of stock here and there, John/US came in handy with a pair of Accuton C244-8 inverted domes and a pair of HIQUPHON OWI tweeters as well, thus the SP44 project was on track. We could also call it Ekta-Accu, but SP44 it will be. Comparing SP44 to the Ekta is obvious and despite not having them side by side, I'm afraid the SP44 will beat the Ekta from a less coloured upper mid/lower treble. These ceramic domes are something.
Now, what can the C44 do the D3806 can't? Well, it goes deeper and it goes higher and it has a remarkable flat response all up to 20 kHz where a serious cone break-up occurs. 20 kHz is really high and nothing to worry about in a 3-way system. The C44 is not particularly sensitive, around 85-86 dB/2.8 volts - but all the same a good match to the 18W/8531 driver that usually can be tuned to a system sensitivity of 86 dB/2.8 volts. Looking at C44 horizontal dispersion, 6 kHz seems like a good starting point for crossing over to the tweeter, thus the C44 is really able to handle all of the important treble range, because we can go even lower compared to the D3806. From simulation 900 Hz looks ideal, but no guarantee this will also sonically make the best transition to the 18W midbass. Has to be tried.
This speaker is heavy and I do not have a
large photo studio, hence some white sheets and two lamps
in my workshop. I hope it provides an impression of the
sculptural beauty of Jesper's latest creation, the Ekta
Why build small speakers when we can have bigger sound for the same money from a bigger cabinet? Well, the answer is simple: Because sometimes they must to be small due to how they will fit in with a given idea about how our living rooms are going to look. WAF is high from small speakers. Even if a slim floorstander doesn't not take more floor space compared to a mini on a stand, the WAF is higher for the latter. Not much we can do about it. Thus this range of Compact Studio Monitors. "Studio" because it started with the 8542 driver for studio use, by request from a Norwegian studio ingeneer. The result was the 8542/9500/9700 design, released last year. Here's a system from the 18W/8545-K00 + XT25TG-30-04.
The sliced paper driver 18W/8531-G00 is a
driver you don't easily get over with. It's got the best
bass from any 6-7" midbass I have ever experienced.
It did great in the SP95 set-up. It did even better in
the SP38 construction and here's the best I have ever
heard from this driver and probably due to the cabinet
made from curved and laminated side panels producing the
most rigid enclosure I have tested. Thanks to Jesper who
came along with this construction.
A friend of mine came up with this project
and had decided on the well-known Scan-Speak 18W/8543-00
drivers for bass. These drivers have been seen in ProAc
speakers and deliver a decent bass and due to the
polypropylene membranes also know to deliver a smooth
midrange sound without being edgy at all (i.e. no serious
cone break-ups). The midrange driver was new to me and
one of the reasons for choosing this one was because it
looked good! Hmm...this is probably not a good reason for
picking a driver but after looking at the data from the dst website I had no
arguments for not choosing this driver. I should later
learn that it also sounds very good. The 9800 is a great
metal dome tweeter and no objections here. So, I made the
cabinet drawings and driver layout, my friend routed the
front panels, the cabinet maker did the raw cabs and I
had to assemble the whole thing and - not least - produce
D2905/9700 - 9500, SEAS 27TFFC
Why yet another 18W/8531G00 sliced paper construction? Didn't the SP95 and the SP98 do well? Why possibly a reduced cabinet volume? And why does USXX predict an optimum 22 litre cab for the 18W driver? Who is USXX and what has LspCAD to do with this? Well, first of all, this construction dates back to the SP95 where I tried the Scan-Speak D3806/8200 mid-dome from 1600 Hz and the HIQUPHON OWI on top from 13 kHz. Click heading to read more.
The 18W/8531-G00 driver had long been on
my wish list. Everything about this driver looks good.
The TS data suggest impressive bass performance and the
response curves do not appear to have any serious
break-ups as seen from so many other drivers. A slightly
elevated SPL response from 1 - 8 (!) kHz should be easy
to control in the crossover. Has Scan-Speak really
succeeded in making a non-coated paper cone with these
properties? The bass from the SP95 set-up by far
supersedes the bass from the 2.5 clone 18W/8535-00
driver in terms of depth and low-end resolution.
Scan-Speak 18W/8531-G00 + D2904/9800
Should someone still be thinking of building the 2.5 clone, take a look at this construction and build something significantly better. Yes, it's a bit more expensive, but I think it's time to bury the clone and get on with our lives. This speaker is at least twice as efficient, goes just as deep and has better midrange and treble. Overall it's a significant improvement.
In 2002 I made a two-way, transmissionline floorstander from these speakers and the sound wasn't bad at all. Eventually I got caught up in other projects and the drivers went back on the shelf. The 8545 was part of the drivers tested for the Acapella midrange - where it did a good job again - but was beaten by a small margin from the SEAS W18EX001 for this particular application. An easy beginner's project. Series filter is used.
It was my intention to call this a mini-monitor, but after having set up the system, I realised this was anything but a mini. Small in size, yes, but in sound it's rivalling many 6"+1" floorstanders.
This construction came about due to a guy
in Sweden having a pair of Opera Callas cabinets fitted
with some OEM drivers. The new Callas use the Scan-Speak
15W/8530-K00 and - presumeambly - the 9500 tweeter. Here
the 9700 tweeter is used.
A 10 litre monitor with exceptional bass extension. The 15W/8530K01 is one of the two 15W brothers with a coated sliced paper cone and with the smallest magnet. Few notes will follow this construction. It was made on request, but I found it so good that I will include it here. The construction is straight forward and it can be used in a 10.5 litre vented, closed or Variovent equipped enclosure. I'm sure the W15/8530-K01 will also perform well in a transmission line cabinet, but take notice that changing the dimensions of the front panel will also add changes to the frequency response. The crossover was optimised for a 19 x 30 cm front panel. Not surprisingly I prefer the vented option giving a deep bass that defies the size of the driver. These 15W drivers comes with a wide rubber surround allowing large cone excursion and they can take a lot of power without sounding compressed.
This speaker came about due to Max in
Sweden asking for a construction from the ScanSpeak
drivers 15W/8530-K00 and D2804/9800 alu dome, similar to
a construction know as the "A4" (front panel =
dimensions of a piece of A4 paper), a Dutch construction
Doing the Ellam 9800 and Ellam XT speakers, the idea of making a d'Appolito construction obviously came to mind. The Ellam25, 2½-way, came first and for some time I've had the Ellam d'Appolito on my website as an experimental set-up. Eventually Jesper (Ekta and Ekta Grande constructions) came by, bringing in a finished Ellam d'Appolito, thus the old file has been updated with new pics and measurements and a slightly fine-tuned crossover, now for the XT25TG-30-04 tweeter.