Info: Dahlquist DQ-20 Speakers
Asking Price:
USD $550.00
Retail Price: USD $1800.00
Payment method: Paypal
Shipping weight: 125.00 (lbs) Calculate Shipping
Shipping Dimension: 20.00in x 24.00in x 40.00in
Condition: 7 – Good (?)
Date Posted: Jun 22, 16 4:30pm
Edited: Jul 25, 16 12:19pm* Updated!
About Seller:
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jposey
Corinth, TX
United States, 76210
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Product Brand: Dahlquist
Product Model: DQ-20
Days in System: 35
Views: 261
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Portrayal
Available to be purchased is a pleasant pair of Dahlquist DQ-20 speakers. The units are in flawless working request and the drivers and their encompasses are fit as a fiddle. As should be obvious, I at present have them snared in my media room and have been getting a charge out of them for a moment. I will get a couple of more photographs once I expel them and connect my ordinary speakers. They are in great condition with minor corrective issues. One speaker is feeling the loss of the Dahlquist symbol, every speaker has maybe a couple little openings in the speaker flame broil material and there are a couple of minor scratches or scratches in the wood outlines, however as should be obvious despite everything they look magnificent and I don’t see any defects at typical listening positions. The dark speck on top of one speaker was a wet unique finger impression, not an opening. Underneath I’ve incorporated an audit that you may discover accommodating.
The presentation of Dahlquist’s unique Phased Array speaker framework, the DQ-10, over fourteen years prior excited significant enthusiasm for the audiophile group. Notwithstanding a shallow outside likeness to the contemporary Quad electrostatic speaker, the DQ-10 was a four-way dynamic framework that, not at all like most other element speakers of the time, was intended to convey a stage intelligible acoustic yield waveform. Still a part of the Dahlquist speaker line, the DQ-10 has now been joined by the DQ-20, a bigger and more refined framework encapsulating comparative standards.
Dahlquist’s Phased Array outline was created to manage two essential territories of amplifier mistake: time-delay contortion and diffraction impacts. As a rule, the immediate sounds from the distinctive drivers of a multiway framework touch base at the audience’s position at marginally diverse times in view of contrasts in the latency of their moving frameworks and unequal separations from their voice curls to their front mounting planes and from the mounting planes to the audience. The joined aftereffect of these impacts can be debased spatial definition.
Diffraction, which can make comparative variations in the listening field, happens when the sound wave leaving a speaker driver experiences an unexpected intermittence in its transmission way, ordinarily at the crossroads of the speaker cone and the mounting load up, at the edge of a bureau, or at the grille outline. The intermittence twists the wave front and diffuses the sound so that parts of it achieve the audience over somewhat diverse ways. At whatever point the same sign lands at a point in space over more than one way (quite often of various lengths), the subsequent obstruction produces abnormalities in the recurrence reaction and debilitates the spatial precision of the stereo imaging.
The DQ-20 is a three-way dynamic speaker framework with vertically adjusted drivers whose 10-inch acoustic-suspension woofer traverses to a 5-inch midrange cone at 400 Hz. The second hybrid, at 3,500 Hz, is to a 3/4-crawl delicate arch tweeter. The midrange and high-recurrence drivers are on a different mounting board stretching out from the highest point of the woofer bureau. The load up is decreased to minimize diffraction of the drivers’ radiation examples, and it is likewise ventured back marginally from the front of the woofer bureau in order to find every one of the drivers in the same acoustic plane. The drivers themselves are further adjusted to make up for their distinctive inertias.
The midrange cone driver is back-stacked by a round and hollow pipe with a little opening in its back surface. The channel gives aperiodic (nonresonant) resistive stacking of the cone and wipes out back radiation, which would exasperate the expected polar example of the framework. The DQ-20’s hybrid system, which is totally hand-wired, utilizes air-center inductors and top notch capacitors. The ostensible framework impedance is 6 ohms (4 ohms least), and its appraised recurrence reaction is 50 to 20,000 Hz ±2.5 dB, or 1,000 to 20,000 Hz ± 1 dB. It is prescribed for use with intensifiers appraised to convey somewhere around 50 and 250 watts.
The woofer fenced in area and the mid/high-recurrence driver board are done in level dark, and they are encompassed by a casing of light oak with an open, dark metal-network grille covering its front and back. The whole framework is mounted on an indispensable base around 3 creeps high, and general it gauges 41 crawls high, 20-3/4 creeps wide, and 11-3/4 creeps profound; it measures 60 pounds.
On the back of the speaker box are the protected multiway restricting posts and defensive breakers for the tweeter and woofer. The DQ-20 is outfitted with Black Diamond spiked feet for reaching the floor, which is said to enhance its imaging qualities. Cost: $1,800 a couple.
Lab Tests
The arrived at the midpoint of room reaction we quantified from our pair of Dahlquist DQ-20 speakers was an incredibly uniform 20 to 20,000 Hz ±4.5 dB. The treble extent, specifically, was level inside ±3 dB from 1,500 to 20,000 Hz. At the point when the nearby miked woofer reaction was grafted to the room bend, the composite recurrence reaction was inside ±4 dB from 33 to 20,000 Hz.
The framework impedance was 5 ohms in the 100-Hz run and achieved at least 4 ohms at 1,100 Hz and a most extreme of 16 ohms at 43 and 2,400 Hz. Its normal quality over the sound extent was roughly 9 ohms. With the standard contribution of 2.83 volts of pink commotion, the sound-weight level (SPL) at 1 meter measured 86 dB. The bass contortion with 4.5 volts info (proportional to a 90-dB SPL) was under 0.7 percent from 100 to 70 Hz, 2.3 percent at 50 Hz, and 5.3 percent at 40 Hz.
In our heartbeat power tests, utilizing a 1-cycle burst took after by 128 cycles of quiet, the woofer’s 100-Hz yield waveform started to level at a contribution of 195 watts into its 5-ohm impedance. Dissimilar to numerous woofers, in any case, it over-burden progressively, with an easily expanding level of second-consonant twisting before the cone and voice loop achieved their physical points of confinement and radiated the cruel scratching sounds that for some speakers are the principal sign of over-burden. At 1,000 Hz the midrange driver consumed the intensifier’s most extreme yield of 1,640 watts into its 4.2-ohm impedance without hinting at over-burden, and at 10.000 Hz the enhancer cut, at 575 watts into the tweeter’s 12-ohm impedance, before the speaker twisted.
Our semi anechoic FFT recurrence reaction estimations at 1 meter on the pivot of the mid/high drivers were for the most part like the room estimations. The reaction at 45 degrees off-hub was near the pivotal reaction, with a normal contrast of close to 6 dB between the two at frequencies up to 15.000 Hz. The fabulous stage linearity of the DQ-20 framework was affirmed by its gathering delay, which was inside ±0.2 millisecond from around 2,500 to 28,000 Hz.
Remarks
Our estimations showed that the Dahlquist DQ-20 was an extremely smooth, wide-go speaker with a profoundly direct stage reaction basically the qualities guaranteed for it. Its affectability was moderate, yet it had no trouble in taking care of expansive crest power inputs without mutilation or over-burden. Its impedance was sufficiently high over the full sound reach to be perfect with any great speaker.
The establishment guidelines prompt putting the speakers well far from the divider behind them and not very far separated. We found them 2-1/2 to 3 feet from the divider and around 5-1/2 feet separated, with fabulous results. It was evident that precise situation was not in the least basic.
The recurrence equalization of the DQ-20 was strikingly near that of our KEF 105.2 reference speakers, which is not astonishing following both have level, smooth recurrence reaction attributes. The KEF speaker, which has a 12-inch woofer in a bigger fenced in area, had marginally better low-bass reaction, however the DQ-20 had an airier sound and a plainly developed top end.
The grilles of the DQ-20 seem, by all accounts, to be as straightforward outwardly as they are acoustically. The divider behind the speakers was obviously unmistakable through the grilles, which may or won’t not be an alluring impact. Since the speaker is not a dipole (in spite of the fact that its appearance would be steady with bidirectional radiation), it is not evident why the back grille is likewise straightforward.
Generally, the Dahlquist DQ-20 is a fine speaker, positioning with a portion of the best we have tried, including much more costly units. It offers a mix of smooth, amplified reaction, wide scattering, and low bass bending that is particularly critical in a speaker of its moderate size and weight, alongside spotless, appealing styling. Furthermore, during circumstances such as the present, its cost appears to be exceptionally sensible for what it gives.
