Loudspeaker Designs and Articles for the DIY Enthusiast
A high sensitivity / high SPL
design offered for Music
Listening Impressions:

Wayne W:
Mids- pure paper baby, pure paper. If you like pure unadulterated Jim Croce, Heart, or
Jefferson Airplane, reproduced the way they recorded, these will do the trick. I also suspect that Jazz,
Blues and Opera will be a big hit. Mids are very coherant. A touch forward, which is to be expected, and full
in a way that isn't annoying.

Highs - Who would have thought that a whizzer cone....I reapeat, a whizzer cone could sound that good. It
has plenty of heat for those that like more sizzle.

Bass - Let's be honest, it isn't going to give you tachycardia, and you aren't going to be knocked out of
your chair, but the bass is all there in the 3.17Cuft MLTL cabinet, even when 2' out from the wall. Anyone
that has listened to Josh Groben's version of Jesu, Joy of Man's Desiring can rest assured that it gets all
the way down, and interestingly enough, it resolves Sarah MacLaughlins voice excellently alongside the
violin (which hasn't been the case in some speakers costing 5 times as much that I have heard).

Sound stage is excellent. Horizontally, they have a small window of forgiveness, but it's there so you don't
need to have your head in a vice completely. Vertically, the highs go bye-bye pretty quick. With a single
point source, they have a special magic all their own.

Pro's - Simple, elegant and listenable. Easily driven with low power amps. Excellent Dynamics! More detail
than you would expect from a paper cone.

Con's - Will not go very loud without falling apart. They get plenty loud enough for me, but if you want
something that plays loud, this isn't for you. Bass isn't as solid as I like it, but it is there, and it goes deep. A
sub may be needed for the smooth jazz crowd, or the electronica minded.

Best Part? - Tweeking is simple. With just two components - an inductor and a resistor, a guy can dip his
feet into the design pool without getting in over his head. The price of admission is light as well. I liked
them with 2.7mH of inductance and 13 ohms of resistance, but you can let your tastes and room decide
what works best for you, without doing a total re-design, or getting impedance issues.

I had always wanted to do a full range design, and not a small one either. I just didn't want to pay $1,200
bucks for an exotic full ranger. For the price, this is an excellent way to feed the habit, try something new
and enjoy a different type of sound.

Initial Impressions:
For those inclined, I thought I would post some initial impressions of the Singularities hooked up to a Jolida

Initial Disclaimer: This the first set of "Full Range" speakers I have had. I don't think that the Aura's or the
HiVi's count.

I played several types of music tonight, and will do some more tomorrow night. Please bear in mind that I
will be very critical of these speakers as they are being compared to my reference speakers (the 851's -
Accuton C220 bass, Accuton C-82 mid, and Hiq OW1 FS tweeter). The disparity in cost alone (well over
$5,000.00) should be noted.

Music List followed by critic:

Tonic SolFa - Pretty good sound. Soundstage wasn't as big as I would have liked it, plenty of bass in my
room, tight with good low end. (Curts room has better low bass, my room has better mid-bass). Not as
much separation in the voices as the 851's. My basement has alot of sound treatment. The lack of a
tweeter was a bit more pronounced here.

Jamie Cullum - Now we're talking. Jazz/Blues, and these eat that up. Piano's and horns sound very natural.
Male Vocals in singular are good. Plenty of bass for the kick drum. High hats just a touch light (again, my
room has lots of sound panels). I may need to drop a bit of resistance....which reminds me why I like
these...tweeking is easy!

Allison Kraus & Union Station - So Long So Wrong. Pretty solid. Allison sounds about right. Soundstage is
more forward than I am used to (about 2 feet out in front of the speakers), but it almost creates a 3D
effect. I can move my head a foot or so to each side without losing the sweet spot.

Chris Botti - Italia - Trumpet....GOOD. Andrea Bocelli....Good. Violins...not so good. I may need to add
more stuffing inside the cabinet.

Josh Groben - Solid B- ....the violins annoyed me a bit, again, but only on what I would consider "busy"
passages...lots of violins playing at once. I am not a big violin on the high note kind of guy, but it poked out
at me a bit here. I still dig that I can really hear Sarah singing with the violin. The lower notes on the violin
sounded good on this.

All in all, they are stacking up to be a very interesting design. The bass is very impressive. I have them
about 1' out from the wall, so they are getting a lot of reinforcement. Run side x side with a speaker that
costs over 25 times more, their shortcomings are revealed. They don't have the crystal clarity that the
accutons do (Neither do the SeaScans), and they don't have the superb highend like the Hiq does,
however, I am still enamored of them. They sounded quite good on the Jolida, but I wonder if the tubes
drop some of the treble and detail. I am going to dig out some Miles Davis and test my theory that they are
excellent on horns. Tomorrow I will hook them to the Parasound Halo as well and see if they brighten up
and get a bit of the detail back. After the Halo, I will hook them up to a modified Accurian (less than
20Watts/channel) to see what they do with less power.

At this point, I have to say that these are worth every penny. Are they as good as my reference? Nope. But
then again, are the AviaTrix or the SeaScans? Nope. Am I enjoying them...YUP! I can see these getting
some rotation time in a big way. Plus, it's cool to see people's face when they hear the bass and

What really sets these apart, is the options to tweek. An outboard cross-over (can you really call it a
cross-over when its just 2 components?) would be the way to start. Drop in or take out resistance or
inductance, and get them dialed in. Then get after the stuffing in the cabinets. For those that like to tweek,
but don't want to spend hours re-assembling...this is the way to go. That they sound good is a bonus as

Later Impressions:

With the wind howling and temps well below freezing, I figured that I could skip working on a pair of
speakers, and actually listen to some that I had already built. This would be the second installment of the
impressions that I have of the Singularities.

So I learned a few things tonight. First among them being that the PS220 really likes my solid state. When
we last talked, I had them hooked up to my Jolida 302A, and it did some good things with the tubes.
However, these speakers really preferred the Parasound Halo A23. Second thing I did was to lose 2 of my
sound panels. I fiddled with the resistance, but couldn't find a happy medium, I went back to my original
values and pulled a couple of panels and found the middle that I was looking for. In case you are
interested, I have 8 panels in my listening area. 4 of which are 1" thick Owens Corning 702 covered with
grill cloth built 24" by 42", the other 4 being 24" x 24".

So - Tonight we played the following (with comments as before)...and yes, that is country music in the
mix!!! SPL's were kept to modest levels and I found that I didn't need to crank it up.

1. Brad Paisley - Mud on the Tires - Whiskey Lullabye.
Bass was really good. Male vocals are solid, Females vocals are solid. They get you to the 90% mark (My
851's being about 98% in my estimation).

2. Keane - Hopes and Fears. This is a typically over-compressed, over engineered pop recording
(crappy), but I found that it wasn't nearly as crappy on the Singularities as the 851's. Maybe missing that
last little bit of detail isn't as bad as I thought!!!!!!

3. Maroon Five - (Okay, I know the drummer's dad...cut me some slack).
Great soundstage for a (see comments on Keane). Bass is all there...not lacking at all. Very good 3D
effects...almost surround sound-esque. At moderate volumes, this was a very nice surprise!

4. Vivaldi - 4 Season (Telarc Recording with some Japanese guy plaing violin...cannot remember his
name, but he is really good). Dynamics are superb. Harpsichord licks and arpeggios are very nice. Bass
undertones are full as they should be. Again, these speakers most surprised me with the tight, accurate

5. Michael Buble-Feeling good, Quando Quando, A foggy Day.
Very interesting. Michaels voice was solid, Nelly Fortado was about right, cymbals where much better than I
expected. The sybillance is very's all there, but not harsh at all....Still hard to wrap my head
around how good that whizzer cone is. A tweeter/ribbon may be a good addition, but if you don't want to
run that way, they get you nearly there without it.

All in all, I am really impressed. I even broke out some Kiss, Firehouse, Ratt, and some Ludacris just to see
what they would do. Not too shabby I may say. The sound stage is different from the 851's, or almost any
conventional 2-way or 3-way. It is very hard to put into words. It's enjoyable, but different....almost like it is
voiced very forward, but not in your face, but not. Confused...yeah, me too. I still haven't figured out if it is
a function of a point-source or if it is just the sound of a full range driver. Either way, if I didn't like them, I
would have quit at Keane.

Build Recommendations:
Will they sound like you expect (unless you are a full-range afficianado) - no
Is it enjoyable - Yes
Will you tweek them - I sure hope so...that's half the fun.
Build difficulty - Newbie, Noob, beginner, novice, first timer. Cabinet's are line to figure out. You
can doll these up as much or as little as you like.

I won't be putting a finish on these for some time, but if anyone close by Lincoln wants a listen and can put
up with bare-naked birch, they are available.
Links to:

Main / Design Goals

Driver Selection

Cabinet Construction

Crossover Design


Listening Impressions