Lyngdorf TDA-2200 er et af de sjaldne "indlysende rigtige ... - 4Audio
Lyngdorf TDA-2200 er et af de sjaldne "indlysende rigtige ... - 4Audio
Lyngdorf TDA-2200 er et af de sjaldne "indlysende rigtige ... - 4Audio
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med data fra <strong>et</strong> separat output pi TAS3 103<br />
DSP'<strong>er</strong>ne (lad os trakke bukseme ned og<br />
kal<strong>de</strong> d<strong>et</strong> <strong>de</strong>n sekundi<strong>er</strong>e signalvej) - og d<strong>er</strong><br />
<strong>er</strong> faktisk tale om en meg<strong>et</strong> fin DAC, id<strong>et</strong><br />
hj<strong>er</strong>t<strong>et</strong> <strong>er</strong> en Wolfson WM8740 chip, med<br />
rneg<strong>et</strong> fine data og mulighed for at reprodu-<br />
c<strong>er</strong>e helt op til 192 kHz sampl<strong>et</strong> mar<strong>er</strong>iale.<br />
Hvorfbr <strong>er</strong> si <strong>TDA</strong>-<strong>2200</strong> si "rigtig"? Jo,<br />
i DSP kredsene kan man lagre <strong>et</strong> to-vejs <strong>de</strong>lefilt<strong>er</strong>.<br />
Den ovre <strong>de</strong>l <strong>af</strong> frekvensomrid<strong>et</strong><br />
sen<strong>de</strong>s f.eks. til d<strong>et</strong> indbygge<strong>de</strong> effekttrin<br />
som driv<strong>er</strong> mellemtone/diskant enhed<strong>er</strong>ne i<br />
hojttal<strong>er</strong>system<strong>et</strong>, mens <strong>de</strong>n nedre <strong>de</strong>l sen<strong>de</strong>s<br />
ud via DAC'en til <strong>et</strong> ekst<strong>er</strong>nt effektrin,<br />
som driv<strong>er</strong> bass<strong>er</strong>ne i hojttal<strong>er</strong>system<strong>et</strong>.<br />
DSP'<strong>er</strong>ne kan sr<strong>et</strong>tes op til at gen<strong>er</strong><strong>er</strong>e forskellige<br />
typ<strong>er</strong> filt<strong>er</strong> respons, med vari<strong>er</strong>en<strong>de</strong><br />
or<strong>de</strong>n<strong>er</strong> og <strong>af</strong>ske<strong>er</strong>ingsfrekvens<strong>er</strong>. Tilmed<br />
kan gain og <strong>de</strong>lay just<strong>er</strong>es, sile<strong>de</strong>s at bassektioneme<br />
ikke nodvendigvis plac<strong>er</strong>es fysisk<br />
sammen med systememe til gengivelse<br />
<strong>af</strong> resten <strong>af</strong> frekvensomrid<strong>et</strong>. H<strong>er</strong> vend<strong>er</strong><br />
je-e tilbage til bemr<strong>er</strong>kningen jeg indledte<br />
med - produkt<strong>et</strong> <strong>er</strong> rigtigt tankt. <strong>Lyngdorf</strong><br />
har igennem fl<strong>er</strong>e:ir advok<strong>er</strong><strong>et</strong> for hBjttal<strong>er</strong>system<strong>er</strong><br />
d<strong>er</strong> inklud<strong>er</strong><strong>er</strong> anven<strong>de</strong>lsen <strong>af</strong><br />
hjorneplac<strong>er</strong>e<strong>de</strong> subwoof<strong>er</strong>e, d<strong>er</strong> tilmed <strong>de</strong>les<br />
relativt hojt i frekvens. HjOrneplac<strong>er</strong>ing-<br />
en gor at <strong>de</strong>n direkte lyd og samtlige refleksion<strong>er</strong><br />
fra gulv og vaegge ankomm<strong>er</strong> samtidigt<br />
i lyttepositionen, og d<strong>er</strong> <strong>er</strong> d<strong>er</strong>med ingen<br />
udtv<strong>er</strong>ing <strong>af</strong> signal<strong>et</strong> i tidsdoman<strong>et</strong>. Tilmed<br />
<strong>er</strong> d<strong>er</strong> maximal "hjzelp" fra rumm<strong>et</strong><br />
ved en hjomeplac<strong>er</strong>ing, si <strong>de</strong>n totale elektrisk-til-akustiske<br />
effektivit<strong>et</strong> foroges, hvilk<strong>et</strong><br />
igen b<strong>et</strong>yd<strong>er</strong> mindre arbej<strong>de</strong> for mem-<br />
bran og fbrstark<strong>er</strong> og d<strong>er</strong>med mindre introduc<strong>er</strong><strong>et</strong><br />
fbrvraengning. Imidl<strong>er</strong>tid <strong>er</strong> d<strong>et</strong> ikke<br />
uprobl<strong>er</strong>natisk at gengive en vesentlig<br />
<strong>de</strong>l <strong>af</strong> frekvensomrid<strong>et</strong> fia hj6mepositio-<br />
nen - <strong>et</strong> flekvenslineeft signal skal forst og<br />
llemmest equalizes, da d<strong>er</strong> ell<strong>er</strong>s vil vare<br />
subjektivt alt for meg<strong>et</strong> bas. Alt d<strong>et</strong>re kan<br />
<strong>TDA</strong>-<strong>2200</strong> gore - ikke <strong>af</strong> sig selv, men med<br />
brug<strong>er</strong>ens hj.elp. De indbygge<strong>de</strong><br />
DSP-funktion<strong>er</strong> <strong>er</strong> naturligvis ikke begrrense<strong>de</strong><br />
h<strong>er</strong>til, d<strong>er</strong> el faktisk <strong>et</strong> utal <strong>af</strong> muliehe-<br />
d<strong>er</strong> fbr <strong>de</strong>n kreative.<br />
Udov<strong>er</strong> <strong>de</strong> t'eatures d<strong>er</strong> var indbygg<strong>et</strong> i<br />
--,<br />
-<br />
-<br />
-<br />
testeksemplar<strong>et</strong>, si <strong>er</strong> d<strong>er</strong> <strong>et</strong> rumkorrek-<br />
tionsmodul pi vej. Jeg hprte d<strong>et</strong> <strong>de</strong>mon-<br />
str<strong>er</strong><strong>et</strong> pi <strong>Lyngdorf</strong> Audio's stand ved CES<br />
i Las Vegas i januzr (se evt. HF nr. 212006),<br />
men d<strong>er</strong> gir endnu lidt tid fgr d<strong>et</strong> <strong>er</strong> klar til<br />
salg. Demonstrationen i Las Vegas indik<strong>er</strong>e<strong>de</strong><br />
dog at d<strong>et</strong> <strong>er</strong> v<strong>er</strong>d at vente pe - men<br />
d<strong>et</strong> kan i pvrigt eft<strong>er</strong>mont<strong>er</strong>es sifremt man<br />
ikke vil venre pe <strong>TDA</strong>-<strong>2200</strong>.<br />
Software<br />
Software til at styre alt d<strong>et</strong>te bliv<strong>er</strong> naturligt<br />
nok en central <strong>de</strong>l <strong>af</strong>hele "system<strong>et</strong>".<br />
<strong>Lyngdorf</strong><br />
Audio har lav<strong>et</strong> en PC-software pakke,<br />
hvori d<strong>et</strong> <strong>de</strong>ls <strong>er</strong> muligt at opgrad<strong>er</strong>e firm-<br />
ware til apparat<strong>et</strong>, <strong>de</strong>ls at konfigur<strong>er</strong>e DSP<br />
funktioneme i apparat<strong>et</strong>. Gen<strong>er</strong>elt <strong>er</strong> vores<br />
indtryk <strong>af</strong> softwaren at d<strong>er</strong> <strong>er</strong> tale om fun-<br />
g<strong>er</strong>en<strong>de</strong> software produkt<strong>er</strong>. men at d<strong>er</strong><br />
trods alt <strong>er</strong> "lidt for meg<strong>et</strong> ingeni6r" i d<strong>et</strong> til<br />
at alle vil fi tingene op at spille u<strong>de</strong>n ar sr6-<br />
<strong>de</strong> i <strong>de</strong>n mindst smule problem<strong>er</strong> - sidan<br />
ville jeg ikke have sagt for I 0 ir si<strong>de</strong>n, men<br />
Windows har gjort nteg<strong>et</strong> for at aendre pi<br />
opfattelsen <strong>af</strong> brug<strong>er</strong>venlighed for software<br />
og softwareinstallation<strong>er</strong>. Er man stadig<br />
nok (og eventuelt ingeni6r), si vil d<strong>et</strong> selvfplgelig<br />
til sidst komme til at virke, men jeg<br />
skal da indrgmme atjeg und<strong>er</strong>vejs drog <strong>et</strong><br />
par opgiven<strong>de</strong> suk hist og h<strong>er</strong>. De fleste <strong>af</strong><br />
<strong>de</strong> problem<strong>er</strong> jeg stgdte pi <strong>er</strong> d<strong>et</strong> dog mit<br />
indtryk relat<strong>er</strong><strong>er</strong> sig til lidt reldre v<strong>er</strong>sion<strong>er</strong><br />
<strong>af</strong> firmwaren. si hvis man <strong>er</strong> kun<strong>de</strong> til en<br />
<strong>TDA</strong>-<strong>2200</strong> i dag, si vil man <strong>de</strong>ls fi <strong>et</strong> appa-<br />
rat med nyeste firmware og <strong>de</strong>ls have adgang<br />
til nyeste PC-software, om ikke and<strong>et</strong><br />
si via Intem<strong>et</strong>t<strong>et</strong>, hvilk<strong>et</strong> bor result<strong>er</strong>e i at<br />
d<strong>et</strong> vil va<strong>er</strong>e ov<strong>er</strong>skueligt at fi software og<br />
apparat i lufien for langt <strong>de</strong> fleste.<br />
Nir softwaren <strong>er</strong> install<strong>er</strong><strong>et</strong> og - ikke<br />
mindst - PC og <strong>TDA</strong>-<strong>2200</strong> hzLr fund<strong>et</strong> hinan<strong>de</strong>n<br />
ov<strong>er</strong> <strong>de</strong>n s<strong>er</strong>ielle RS232 forbin<strong>de</strong>lse<br />
og <strong>er</strong> pi bolgekeng<strong>de</strong>, si fung<strong>er</strong><strong>er</strong> alt meg<strong>et</strong><br />
intuitivt og ligefremt. Centralt i <strong>Lyngdorf</strong><br />
DSP softwaren <strong>er</strong> en gr<strong>af</strong>isk reprasentation<br />
<strong>af</strong> DSP-funktion<strong>er</strong>ne og signalvejene i<br />
<strong>TDA</strong>-<strong>2200</strong>, og d<strong>et</strong> <strong>er</strong> faktisk nemmest at<br />
forstii <strong>de</strong>n inteme opbygning <strong>af</strong> <strong>TDA</strong>-<strong>2200</strong><br />
hvis man stud<strong>er</strong><strong>er</strong> billed<strong>er</strong>ne lidt. D<strong>er</strong> <strong>er</strong><br />
i6-'.-.* I_-[<br />
qd<br />
r-.g<br />
,-=--l -,! -l<br />
Forste rke rens signal-rutediagram. Sig-<br />
nal<strong>et</strong> pass<strong>er</strong><strong>er</strong> igennem en global equali-<br />
zing funktion, og kan d<strong>er</strong>nest splittes op<br />
i prim<strong>er</strong> og sekund<strong>er</strong>t signal i <strong>de</strong>leftlt<strong>er</strong><br />
("Crossov<strong>er</strong>") blokken. Begge disse sig-<br />
nal<strong>er</strong> pas s <strong>er</strong><strong>er</strong> eft<strong>er</strong>f4lge n<strong>de</strong> igenne m<br />
d<strong>er</strong>es egne equalizing jiltre og gain/<strong>de</strong>-<br />
lay blokke.<br />
N<strong>er</strong>bille<strong>de</strong> <strong>af</strong> hvad d<strong>er</strong> sk<strong>er</strong> i "Global<br />
Equaliz<strong>er</strong>" blokken. Hele blokken <strong>er</strong><br />
und<strong>er</strong>op<strong>de</strong>lt i seks equaliz<strong>er</strong> funktion<strong>er</strong>,<br />
hvor drop-down menuen til venstre vis<strong>er</strong><br />
hvilke valgmulighed<strong>er</strong> d<strong>er</strong> forejin<strong>de</strong>s for<br />
hv<strong>er</strong> enkelt equaliz<strong>er</strong>funktion. Ndr ty-<br />
pen <strong>af</strong> equaliz<strong>er</strong>funktion <strong>er</strong> valgt, sd<br />
velges Q, gain og frekvens.<br />
N<strong>er</strong>bille<strong>de</strong> <strong>af</strong> hvad d<strong>er</strong> sk<strong>er</strong> i "Cross-<br />
ov<strong>er</strong>" blokken. H<strong>er</strong> <strong>er</strong> valgt <strong>et</strong> 4. or<strong>de</strong>ns<br />
LRfilt<strong>er</strong> med en sk<strong>er</strong>ingsfrekvens pd<br />
140 Hz<br />
ir<br />
*Fl<br />
(r.<br />
tl<br />
*,-l<br />
I<br />
!<br />
! I bbfr--- ))<br />
--<br />
rI<br />
som sagt tale om grundlaeggen<strong>de</strong> to kanal<strong>er</strong>',<br />
nemlig <strong>de</strong>ls en primr<strong>er</strong> ("Main Channel")<br />
som fgr<strong>er</strong> input via div<strong>er</strong>se equaliz<strong>er</strong>e og<br />
<strong>de</strong>lefilt<strong>er</strong> ("Crossov<strong>er</strong>") til d<strong>et</strong> int<strong>er</strong>ne ef'- ><br />
3/06 HlGHfi<strong>de</strong>lity 53<br />
-<br />
-