Dunlavy Audio Labs SC-IVa Floor Speakers

This listing is for a pair of Dunlavy SC IV / A floor speakers in light Oak. In excellent condition but would need to ship freight.

The SC-IV/A is the result of research evaluating every possible way of improving the SC-IV's measurable and audible performance.

The enclosures are the same size as the IV's, with proportions that are the most pleasing in the entire line. Remove the grille and you'll note the same symmetrical arrangement of midrange drivers and woofers around the centrally located tweeter, with heavy felt around the tweeter and midrange (a method of diffraction control for which Dunlavy holds the patent). However, the arrangement of felt on the two models is not the same: on the SC-IV, the felt around the tweeter is in rectangular blocks, whereas on the SC-IV/A it's "stepped" so that the opening is shallower farther from the tweeter. John Dunlavy says that only the SC-IV/A has the stepped felt surround, which is individually matched to each speaker. The tweeter and midrange units are the same in the SC-IV and the SC-IV/A, but each has gone through three or four generations of improvements since the original SC-IV.

With the grilles off, you notice that the woofers are different. The SC-IV woofer is a treated-paper cone made by Vifa, whereas the SC-IV/A woofer has a carbon/paper/fiber cone sourced from ScanSpeak. According to Dunlavy, the ScanSpeak woofer has a much more powerful magnetic structure than the Vifa, and costs about four times as much. To get the best in bass performance, there's no substitute for magnetic flux, and big magnets are expensive. When you consider the fact that a pair of these speakers has four woofers, and that the usual pricing rule dictates the retail price to be four or five times the manufacturing cost, the price difference between the SC-IV and the SC-IV/A starts to make sense.

Another major difference between the two speakers is the crossover. John Dunlavy has always used first-order crossovers, and he hasn't abandoned this approach—the only one that, in conjunction with a stepped or sloped baffle, can yield time coherence, the sine qua non of his designs. However, there are many ways of designing and executing a minimum-phase crossover, and the SC-IV/A's crossover uses almost twice as many components as the one for the SC-IV. Compared to most speakers, the SC-IV's on-axis frequency response was already extremely linear, but this didn't satisfy Dunlavy. First, he tweaked the crossover points, improving the blend between the drivers. He then turned his attention to the small nonlinearities in the frequency response—the minor peaks and valleys caused by the drivers' electromechanical characteristics. The SC-IV/A's crossover has tuned resonant circuits to reduce these nonlinearities, with specific trim values determined by the individual testing of each speaker.

This labor-intensive process takes several hours, and is another reason for the difference in price. Though equalization of driver frequency response is not unique to Dunlavy, I know of no other speaker manufacturer that has taken it to this extreme.

Specifications

Description: Three-way dynamic loudspeaker. Drive-units: 1" composite textile-dome tweeter, two 5.5" paper-cone midranges, two 10" long-throw paper-cone woofers. Crossover: first-order design (frequencies not specified). Biwire and biamp capability. Frequency response: 25Hz-20kHz, ±1.5dB; -3dB at 20Hz (anechoic). Sensitivity: 92dB/W/m. Impedance: 5 ohms nominal; 3.0 ohms minimum, 7.5 ohms maximum. Recommended amplifier power: 50W minimum into 8 ohms. Recommended listening distance: 8-25'.
Dimensions: 72" H by 12" W by 18" D. Weight: 190 lbs.

Orig Price: $7995/pair in light or black oak,

Guaranteed to work correctly for 30 days baring abuse.
Offered for $3000 plus shipping.
_________________________________________________________
Revised shipping policy as of September 20, 2014.

Due to items lost or damaged in shipping, any item over $50.00 in cost will require delivery confirmation and insurance for the sale amount. It is unfortunate that this is necessary but experience has proven it is well worth the small extra cost. We apologize for this, but it is for the good of all involved.
Our reputation is very important to us. If you would like to check our eBay feedback rating you will find over 2000 satisfactory transactions with no negative results. We still maintain a 100% positive feedback rating. soundideasflorida is our user name.

TERMS: All listings are plus shipping unless noted. 6.00% sales tax added to all In-Florida destinations. This unit is guaranteed to be in "as described" working condition (unless otherwise noted) upon arrival and has a 60 day limited warranty, baring any abuse. 15% restocking fee on all returns unless defective or "not as described"

SHIPPING: We ship internationally on smaller items . Domestic packages are shipped via Fed Ex. All international shipping quotes will include insurance and delivery confirmation. Shipping charges reflect actual cost of shipping, plus a nominal fee for packaging materials. Items are very carefully packaged for shipment. Items ship from 32609 in Florida.

INSURANCE: International shipments to countries that do not allow insurance, buyer
assumes FULL RESPONSIBILITY for the safe shipment of their packages. Sound Ideas cannot provide refunds or compensation for packages shipped without shipping insurance. All shipping quotes for packages shipped includes insurance.

RETURNS: Any item may be returned within 15 days for a full refund of the purchase price, not including shipping, unless otherwise stated in the ad. It must arrive back at our store in Florida in the same condition as sent. 15% restocking fee on new items that were opened.
International purchases need to be returned with incoming custom's duty prepaid, if any. Any postage or import duty that is due upon arrival will be deducted from the refund. 15% restocking fee also on all returns unless defective or "not as described."

CONTACT: We stock over 50,000 vacuum tubes.)Since 1977. We carry over 50 new brands of electronics, please stop by the store when you are in Florida.
Thank-you for your time and interest!

Guaranteed to work correctly for 30 days baring abuse.
Offered for $1250 plus shipping. Prefer local pickup, or freight on a skid, probably wouldn't survive fedex or ups.
_________________________________________________________
Revised shipping policy as of September 20, 2014.

Due to items lost or damaged in shipping, any item over $50.00 in cost will require delivery confirmation and insurance for the sale amount. It is unfortunate that this is necessary but experience has proven it is well worth the small extra cost. We apologize for this, but it is for the good of all involved.
Our reputation is very important to us. If you would like to check our eBay feedback rating you will find over 2000 satisfactory transactions with no negative results. We still maintain a 100% positive feedback rating. soundideasflorida is our user name.

TERMS: All listings are plus shipping unless noted. 6.00% sales tax added to all In-Florida destinations. This unit is guaranteed to be in "as described" working condition (unless otherwise noted) upon arrival and has a 60 day limited warranty, baring any abuse. 15% restocking fee on all returns unless defective or "not as described"

SHIPPING: We ship internationally on smaller items . Domestic packages are shipped via Fed Ex. All international shipping quotes will include insurance and delivery confirmation. Shipping charges reflect actual cost of shipping, plus a nominal fee for packaging materials. Items are very carefully packaged for shipment. Items ship from 32609 in Florida.

INSURANCE: International shipments to countries that do not allow insurance, buyer
assumes FULL RESPONSIBILITY for the safe shipment of their packages. Sound Ideas cannot provide refunds or compensation for packages shipped without shipping insurance. All shipping quotes for packages shipped includes insurance.

RETURNS: Any item may be returned within 15 days for a full refund of the purchase price, not including shipping, unless otherwise stated in the ad. It must arrive back at our store in Florida in the same condition as sent. 15% restocking fee on new items that were opened.
International purchases need to be returned with incoming custom's duty prepaid, if any. Any postage or import duty that is due upon arrival will be deducted from the refund. 15% restocking fee also on all returns unless defective or "not as described."

CONTACT: We stock over 50,000 vacuum tubes.)Since 1977. We carry over 50 new brands of electronics, please stop by the store when you are in Florida.
Thank-you for your time and interest!

No questions have been asked about this item.