Boston Acoustics 555x 575x 595x THX speaker package
Jason Kaufmann wrote:
> Does anyone own the Boston THX 555 and 575 THX speaker package, if so can
> you tell me the specifications, such as the frequency Response, Recommended
> Amp Power, and the sensitivity.
watts sensitivity frequency resp drivers
----- ------------ --------------- ----------
fronts 555x 150W 90dB @ 1W 1m 8ohm 80-20kHz +-3dB 2*4.5" 2*1"
surrs 575x 150W 85dB @ 1W 1m 8ohm 125-20kHz +-3dB 1*4.5" 2*2.5"
sub 595x 250W 85dB @ 1W 1m 8ohm 20-80 Hz +-3dB 1*12"
These are the claimed specs.
Many years ago a common matching was the 555x, 575x, and 595x Boston
Acoustics THX speaker set and the Kenwood KM and KC-X1 THX amp and pre-amp.
The rating for the KM-X1 was:
- 100W rating,
- clipping 8ohm 140W headroom re:100W +1.5dB
- dynamic power 8ohm 165W headroom re:100W +2.2dB
Also two 595x subs were commonly wired in parallel and connected to one of
the six KM-X1's amplifiers. This setup played loud in my setup and I
was able to play 112dB C pink noise without any distress in my listening
room. Strangely other Boston owners could only get around 104dB C numbers
from similar setups. I don't know why. But in anycase, 100W into a
pair of 595x is underpowering them and I believe 400W to be a better match.
Also the 125-20kHz +-3dB frequency response for the 575x surrounds is
not correct, like most other DPL surround speakers of their day, they
started rolling off the highs around 8kHz which was OK back then (pre AC3).
I thought the 575x dipoles were nice at the time but I wouldn't recommend
them for an AC3 setup today.
The original Boston Acoustics THX speaker package was a nice setup at
a reasonable price. It was loud, detailed, and far from harsh. Many
high-end purists frowned on this setup, heck, to this day many of the
purists dislike the whole THX concept but thats another story. Truth was,
that for Home Theatre, this cheap Boston package blew away many so called
"audiophile" owners setups and this disturbed them to no end.
Today I think Boston Acoustics is on there 3rd or 4th generation THX
speaker package and it seems like most stores have dropped the line.
THX seems to have lost a lot of the momentum it once had. Maybe the
new 6.1 format and the Star Wars movie will return some of the THX glory.
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