This amount of stuffing is based on measurements and extensive listening tests. We find 12 grams of polyfill to achieve the best balance between the time and frequency performance of the bass system. However, the time response will be slightly deteriorated. If, on the contrary, more polyfill stuffing is used, the enclosure will behave closer to a sealed box and a higher Q will be obtained. Decreasing the vent stuffing will improve the time response of the bass system, but will lower the bass output due to the lowered Q. We suggest mounting a piece of screening material over both sides of the vent to hold the stuffing in place. The quantity of polyfill stuffing used in the vent is 12 grams. The highly damped vent acts as an acoustic resistor, resulting in a non-resonant (aperiodic) system.
The cabinet stuffing (50g) is distributed evenly inside the box. Adding internal bracing to stiffen the cabinet is a good idea for the advanced builder, and will further enhance the performance. For best performance, these dimensions should be followed closely.
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Position of the drivers and dimensions of the cabinet walls and vent opening are all very similar to those of the original Dynaco A25. The SEAS A26 loudspeaker is based on a 28-liter cabinet. The resistor value can be adjusted to fine tune the tweeter level (12, 10 or 8.2 Omega ).
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The tweeter is easily matched to the woofer using a first order network consisting of a single capacitor (3.3 Farad), along with a series resistor (10 Omega ) for level matching.
The use of linear drivers with complementary roll off characteristics allows for excellent performance without the need for complex filter networks. The well behaved roll off of the woofer’s paper cone, aided by the four layer voice coil, allows it to be connected directly to the amplifier, just as in the original. The crossover closely follows the original A25 design, and is a model of simplicity. The magnet system, based on a powerful neodymium ring magnet contributes to the exceptionally high sensitivity and low distortion of the T35C002.
Kurt Müller Gmbh in Germany ensures excellent performance and consistency. The T35C002 is a new dome midrange/tweeter designed in the tradition of the classic 1.5" H087 tweeter, first offered by SEAS in 1968. A coated fabric dome with integral surround, manufactured by Dr. This membrane together with aįour-layer voice coil contributes to a very well controlled roll off characteristic. It produces a smooth response up into the critical midrange, while keeping resonances to a minimum. The A26RE4 uses a classic, uncoated paper cone and matched natural rubber surround. The drivers for the A26 have been designed to closely match the characteristics of the original A25 drivers, while adding the advantages of modern production techniques and materials. The important tonal qualities of the original drivers have been retained, while parameters like power handling, consistency, and durability have been vastly improved. (the A-25s) are quite probably the best buy in high fidelity today." J. Gordon Holt, founder of Stereophile Magazine, had this to say about the A25: "You will have a hard time buying more musical naturalness at any price. It was highly acclaimed by audiophiles of the day, and received extremely positive reviews from consumer magazines as well as in the high-end audio press. The A25, designed and built by SEAS, was one of the most popular loudspeakers ever produced, with more than 1 million units sold. The A26 loudspeaker design is based closely on that of the legendary Dynaco A25 loudspeaker, first introduced in 1969. Carefully designed drivers with complementary response characteristics allow for a crossover network using only two components. The SEAS A26 is a 2-way loudspeaker kit, using a 26 cm paper cone woofer and a 35 mm textile dome tweeter, in a compact 28 liter aperiodic enclosure.
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