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Copyright 2018 & Troels Gravesen, Denmark
CLICK IMAGES TO GO TO CONSTRUCTION
Welcome to my website! Below you will find articles on some of the work
done over the last fifteen years. Building speakers has be on and off since
high school, but with the availability of PC-based measuring equipment
in the Nineties my hobby took another direction as it became very much
clear, that doing crossovers by calculation and fine-tuning by ear had
its shortcomings. Over the years my focus has moved from small
inefficient speakers to larger constructions providing the dynamics that
make reproduced music live and engaging. Below you will find speakers
ranging from 2 to 300 litres volume and I hope you will find inspiration
for your next DIY project.
In case you want advice on which speaker to build, please read both ""
before writing. I shall not recommend any speaker for reasons outlined
in the "" file, and please do not ask about the sonic differences between
two speakers. What I hear is unlikely to be what you will hear.
Designing loudspeakers is not rocket science. Designing loudspeaker
drivers is another thing, but picking 2-3 drivers and making a
suitable cabinet and crossover is basically a matter of handling fairly
simple measuring equipment, simulation software - and experience. Some
call the voicing of speakers an art. I'm not so sure. Voicing a speakers
is a matter of taste like adding spices to a stew. Some like it hot,
some don't. The ancient Greeks
didn't distinguish between art and craftsmanship and I've met "artists"
that had better call them craftsmen/musicians than artists - and
visa versa. Art is art if enough people think it is.
If you want to modify the constructions shown here, please read ""
before doing so. In most cases you will need a new crossover and I would
need your speaker on my test bench to tell you how. DIY SERVICE is
provided in case you live in driving distance of
. This for your up-grade of existing
speakers or crossover design for your own construction.
Since January 2014, all schematics are closed, i.e. crossover
components' values only comes with purchase of the kit. The reason for
this can be
All technical questions,
For purchase of kits, contact:
None of the constructions, illustrations or
information presented here&may be used for commercial purposes without
my written consent.
The constructions are divided into sections based on the main driver in
the system, e.g. SEAS, SBAcoustics, ScanSpeak, AudioTechnology. I'm very
fortunate to be sponsored by these companies and without their generous
support, very little of this would have been possible. Unless
specifically stated, all constructions are based on my own preferences
and I may combine drivers from different manufacturers if I think they
will make good partners.
All underlined text
is a link, regardless of font properties. If you have questions
regarding your speakers, please include links, photos and crossover
schematics if available! There are thousands of speakers in this world,
and I only know a fraction of them and can't google them all.
Regarding frd and zrd files for crossover simulation: I do not provide
these from my library and please do not send your own for evaluation.
The common habit of anonymity on discussion forums is sad I think. If
you have questions or comments, please state your name and the country
you live in to give me an idea of the hifi environment you live in. Feel
sure I need your response to make this website better.
I have a lot of mails and answering takes time and please do not feel
neglected if my reply is short. I regard all communication between you
and me as personal, so do not post my comments or graphics on discussion
forums, websites, etc. without my written consent.
Smaller 2-way stand-mount speakers
4-5" midbass
6-7" modbass
CLICK IMAGES TO GO TO CONSTRUCTION
Slim floor-standers - and one wide
Open and semi-open baffle speakers
Bookshelf Speakers
Bookshelf 3-Way-Classic
FUSION SPEAKERS
Speakers combining various brands
Constructions based on the 8008-HMQ high-efficiency driver
Center speakers
3-way Classics, stand-mount
Larger 3-way floor-standers
4- and 5-way speakers
SBAcoustics Speakers
Vintage& and High-Efficiency Speakers
CLICK IMAGES TO GO TO CONSTRUCTION
Up-Grade Kits for Vintage Speakers
My reference system
Speaker constructions featuring drivers
SEAS, AudioTechnology, ScanSpeak,
Jantzen Audio and
Accuton drivers
Nothing for he time being
BOLD = new speaker constructions
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Click heading to go
to overview of HES constructions. Click image to go to HES speakers
introduction.
Read feedback from HES builders
JA8008-HMQ DRIVER
Read here about the MKII versions and some background that may
not be included in the mkIII articles:
JA8008 used in open baffle constructions:
Background experiments:
Amplifiers:
I consider the Accuton the main driver here
heading or image to go to SEAS constructions' overview.
3-WAY CONSTRUCTIONS 50+ LITER
3-WAY CONSTRUCTIONS 30-50 LITER
(single pdf file)
2 1/2 -WAY CONSTRUCTIONS 20-35 LITER
CONSTRUCTIONS 15-30 LITER
MINIS, 4-8 LITER
DISCONTINUED
Click heading or image to go to ScanSpeak constructions' overview
3- to 5-way constructions, 50+ litres:
3-way floorstanders max. 40 litre
2-way floorstanders, max 35 litre
Bookshelf speakers
2-way stand-mount, max 20 litre
Minis, max 10 litres
Other ScanSpeak stuff
Discontinued
, bass and mid
drivers no longer available and no obvious substitutes. Bass drivers can
be substituted by 18W/8545-K00 if you can find 13M drivers
, bass drivers no longer
available.
One builder reported good results with
for bass. I very much think this driver should work
given the 90 dB sensitivity
Click image or heading to go to Jenzen
website explaining the basic ideas behind the constructions
(standmount d'Appolito, can be used as center
Click heading or image to go to Audio
Technology constructions' overview
Click heading or image to go to Peerless
constructions' overview
Peerless HDS
830875 + ScanSpeak D
, HDS 831882 + XT25TG30-04, 831882 drivers very
hard to find
, HDS134, 850488, discontinued
Click heading or image to go to
constructions' overview
, 2-way 11.5 liter bookshelf mini, or 25 liter
d'Appolito, can be used for center speaker
, floorstander, 24 liter
drivers very hard to find
. C20 drivers very hard to find
drivers discontinued and very hard to find
. C20 drivers discontinued and very hard to find
discontinued.
JA8008/TW034 and Eminence Deltalite II 2515,
fully passive crossover
, discontinued.
experiments.
Click heading or
image to go to vintage intro
James B. Lancing, JBL
WHARFEDALE
(=OB7 article)
, pdf file.
Links to other sites:
MAIN SYSTEM
WORKSHOP SYSTEM
, occasionally bi-amped with:
For most larger speakers I use bi-amping,
for the bass and
/ for mid-tweeter. Go to bi-amping
to see what bi-amping looks like.
Bi-amping means you have a line-stage, a
pre-amplifier, driving two power amplifiers, which each runs either bass
or mid-tweeter. This requires the crossover is separated in bass section
and e.g. mid-tweeter section.
Bi-wiring means you have the same amplifier connected to bass
and mid-tweeter with separate speaker cables. It also requires the
crossover to be separated in sections for bass and mid+tweeter.
AMPLIFIERS IN STOCK
Phono stage:
Line stages:
Power amps:
SPEAKERS IN STOCK (this changes all the
MUSIC SOURCES
(discontinued)
Miscellaneous
Formerly owned components (except speakers): (a few of -)
- Einstein website I never thought I'd buy a twenty years old solid
state amp, but this one is special. This 60 wpc amp runs the ATS-4 - all
of it - without any trouble. The most dynamic and deep bass I've ever
heard from a 60 watt solid state. Bought for 800 EUR on eBay 2013. It may
not have the holographic midrange of the GlowMaster, but overall
coherence is phenomenal. And it's very much class AB... never say never.
Friend of me recently bought the amp to find it with
bleeding electrolytic caps and burned resistors. No sound at all. Buying
old stuff can be gambling, so take care!
Audio Research SP16L
Copland CTA 505
Numerous LCAudio
power amplifiers
DACT line stage
Numerous home-made valve line stage
amplifiers
Luxman MQ70 (EL34) power amplifier
Erno Borbely MosFet power
amplifiers
Danish High Fidelity magazine preamplifiers, MC, phono and line stages
Click logos to go to websites
Crossover components found on this website are sponsored by
.& Jantzen
Audio has the most extensive range of baked coils available,
supplemented by a wide range of audio grade capacitors. In addition to
this a wide selection of components for speaker building.
crossover kits for the shown constructions can be ordered at:
For SEAS, ScanSpeak, SBA and AudioTechnology constructions, this can include drivers as well.
I'm particularly grateful to Jantzen Audio for taking the financial risk
of launching the
drivers. Without their support these drivers would never
have been made.
Some of the drivers used in the constructions were
sponsored by
drivers), ,
Thanks to those who made this possible! Without your support only a few
constructions would have made these pages.
None of the
constructions shown at my website were suggested by any of my sponsors
and I'm not financially affiliated with any of my sponsors. For
questions regarding the constructions on this site, please contact me| 高级搜索
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