View Full Version : feeler: boston acoustic 5.1 computer system

02-16-2006, 04:46 PM
I got this not too long back when I got my computer. Its a pretty sweet 5.1 system(sound card required). The system has little play time on it because never really had the space to hook up a 5.1 system to my computer. The unit is sitting in my room in the basement when the desktop that its supposed to be hooked up to is upstairs in the office. Not sure on the specs right now. If interested hit me on pm and I can get pics if requested.

02-16-2006, 10:09 PM
Number of satellites and subwoofers 2 two way satellites (front) and 2 single driver (rear) satellites plus subwoofer.
Satellite dimension Approximately 7.5" (19 cm) x 5.25" (13.3) x 4.25" (11 cm) (H x W x D) with stands.
Subwoofer dimension 28.5 cm (11.25 inch) (width) X 33.5 cm (13.25 inch) (height) X 37 cm (14.5 inch) (depth)
Weight Subwoofer is 9.6 kg (21 pounds)
Satellites: 0.9 kg (2 lbs) each (note: I think there is a difference in weight between front and rear)
Cables Satellite cables: 2.44 m (8 feet) for the front speakers and 6.1 m (20 feet) for the rear.
Custom 3 pin cable going into subwoofer with 2 permanently attached stereo mini-jack cables (for sound card connection at the other end. to the sound card?s front and rear (optional) inputs - 2.44 meter (8 foot) cable.
Control center cable - 2 meters (6.56 feet) coming from the .
Standard 8 foot / 2.44 m AC cord;
Correctly placing the satellites.
Powering up the system, set the master, bass

Floor stands/Wall mount options Rear satellites have molded screw slots on the back.
Driver Size 3" in each satellite plus a 0.75" tweeter in each of the two front satellites
8" woofer in the subwoofer
Power output/satellite 16 Watts RMS (per FTC Rating Method 16 CFR Part 432, 12/22/00)
Power output for subwoofer 34 Watts RMS (per FTC Rating Method 16 CFR Part 432, 12/22/00)
Total Power 98 Watts RMS (per FTC Rating Method 16 CFR Part 432, 12/22/00)
Maximum Sound Pressure Level 113 dB on Gateway Site, 111 dB @ 0.7 m in manual
Noise N/A
Frequency response 32 Hz to 20 kHz +/- 3 dB on website - manual lists 38 Hz to 20 kHz +/- 3 dB)
Inputs 4-analog
Input sensitivity for maximum output: N/A – (input impedance listed as 10,000 ohms
Headphone output: Yes – amplified
Subwoofer Output: No
Decoder No
Stereo to 4 or 5.1 expander No - See Stereo to 4 or 5.1 Expansion Technologies article for details on stereo to 4 or 5.1 technology.
Equalizer or effect mode (e.g. Theatre preset) No
Controls On front satellite - power/master volume, surround volume (not a front rear fader) and subwoofer level.

Our Objective Measurements

Measured SPL (loudness) Overall the Logitech Z-560 is the loudest 4.1 system we have tested, but the BA7800 delivers volume that is also above average (106 and 108 dB in our two tests). These levels need to be reduced by about 2 dB to be mostly distortion free.

Subwoofer exaggeration At the 80 dB setting the sub can be exaggerated by about 14 dB with very good quality. At the 90 dB setting the subwoofer has about 10 dB of exaggeration range with acceptable quality (some distortion though) or 5 dB with very good quality.

Measured Frequency response Our tests show a very smooth frequency response of approximately +/- 3 dB from around 185 Hz right through to 10 kHz on the front satellites. From 10 kHz it climbs to somewhere between a +4 to +4.5 dB peak at 12.5 kHz from which it declines down to around ? 1 dB by 20 kHz. The rear speakers are in the +4/-3.8 dB range from 173 Hz to 13.7 kHz.

The subwoofer is at the -3 dB point from a 100 Hz reference point at about 160 Hz and ? 10 dB at 258 Hz. Looking in the other direction the ? 3 dB point from the 100 Hz reference level is approximately 47 Hz, - 5 dB is 43.5 Hz and ? 10 dB is around 37 Hz. At 33 Hz the output is around 15.5 dB below the 100 Hz reference point. Perhaps Boston Acoustics is factoring room acoustic effects into their stated specs but even so we don't see it extending to 33 Hz within a -3 dB point.

02-16-2006, 10:39 PM
edit to the above post: the model # is 7900 so it is a TRUE 5.1 system i cant find a reveiw or specs on its sorry but i think its probably pretty close to the specs in the post above

02-16-2006, 10:48 PM
can you put up some pics, how much? thx

02-17-2006, 01:13 AM
wkathol@gmail.com with pictures and price

02-17-2006, 03:18 AM
why do you hid the price ? :(

also can this be used for a television with a headphone jack?

02-19-2006, 01:26 AM
can you put up some pics, how much? thx