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OFF - BEST OFFER FOR: The PSB 400 Audiophile Speakers

Item #649351819
Info: The PSB 400 Audiophile Speakers

Payment method: Cash, Money Order, Money Wire, Interac/EMT
Condition: 8 - Very good (?)
Date Posted: May 01, 17 9:03am (PST)
Edited: Aug 05, 17 10:37pm
About Seller: David Dov
David Dov is a premium user
North York,Toronto, ON
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The PSB 400 is one of the speakers from the Canadian designer Paul Barton.(PSB)
One of Barton's goals was to provide as much as possible of the essential quality of PSB speakers, widely recognized for their uncolored, musical sound, in relatively small, inexpensive speakers.

The PSB 400 is a compact two-way system with a 6-1/2-inch polypropylene-cone woofer operating in a vented enclosure. A 3/4-inch soft-dome tweeter radiates the higher frequencies. No specifications were provided in the installation-instruction booklet, which deals only with general considerations, but the Model 400 appears to use the same drivers as the even smaller PSB Alpha.

The all-black cabinet is 16 inches high, and each speaker weighs 17-1/2 pounds. The tweeter is recessed slightly, and its rim flares out to make a smooth transition with the speaker panel. The woofer basket is also mounted flush with the panel. A removable black cloth grille is retained by plastic snaps.

The connecting terminals are multiway binding posts on 3/4-inch centers, recessed into the rear of the cabinet. They are compatible with single or dual banana plugs as well as wire ends.

We placed the PSB 400 speakers on the optional 27-inch-high PSB stands, approximately 9 feet apart and 2 feet in front of a wall, for our room measurements and listening tests. The room-response curve, averaged for both speakers at a single microphone location, sloped downward slightly above 500 Hz but varied only ±3 dB from 300 to 20,000 Hz.

The close-miked woofer response (including the contribution of the port) reached its maximum at 100 Hz, sloping downward at 6 dB per octave below 80 Hz and more gradually above 100 Hz. The composite response curve, which agreed fairly well with the sound quality of the speakers, indicated a smooth, gradual downward slope from 100 Hz to at least 5,000 Hz, with a more uniform average output from 5,000 to 20,000 Hz.

Response measurements at 1 meter on the tweeter's axis, with a swept one-third-octave band of pink noise, indicated a remarkably uniform output, varying only ±2 dB from 50 to 20,000 Hz and falling off precipitously at lower frequencies. That was generally consistent with what we heard from the speakers.

Other measurements, made with a variety of quasi-anechoic techniques, showed a rough agreement with the earlier measurements. Some of the peaks and dips in the measured response occurred at the same places in all the measurements, but others did not necessarily coincide.

One fact was evident from all our data. Whatever the method of measurement, the response of the PSB 400 was strikingly smooth, with a typical output uniformity of ± 2 dB from a few hundred hertz to 20,000 Hz (at lower frequencies there is unavoidable and frequently unpredictable interaction with the room boundaries).

The use of a 3/4-inch tweeter not only contributes to the system's extended high-frequency response but gives it better angular dispersion over its full frequency range. At 45 degrees off the tweeter's axis, the output dropped only 3 dB at 10,000 Hz and 8 dB at 20.000 Hz. Phase linearity in the tweeter's range was also excellent, with a total group-delay variation of less than 100 microseconds from about 4.000 Hz to 20,000 Hz and about 200 microseconds at 2,000 Hz (close to the probable crossover frequency).

Impedance was a minimum of 4.5 ohms at 170 and 40 Hz and a maximum of about 17.5 ohms at 68 and 1,900 Hz. Since the impedance fell below 6 ohms over much of the lower midrange, we would rate the system at 5 to 6 ohms. Sensitivity, with an input of 2.83 volts of pink noise, was 87 dB sound-pres-sure level (SPL) at 1 meter. With 4 volts drive (corresponding to a 90-dB SPL), the woofer distortion was comfortably low, ranging between 0.6 and 1 percent over most of the frequency range from 80 to 2,000 Hz. It rose to 2 percent in the range of 45 to 60 Hz. The lower frequency limit of the PSB 400 could be rated at 45 to 50 Hz, which is very good performance for a single 6-1/2-inch woofer in a small cabinet.

I work hard with considerable time spent and I ensure that only original parts are used to restore these projects
I am an honest Seller who loves doing this as a hobby, and strives that you will WANT to deal with me!
So that the end user can deal with complete confidence!


Original grill covers in great condition!


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