Danish Audio ConnecT. Technical info. SMD (Surface Mount Device) resistors versus conventional leaded resistors. DACT uses Surface Mount resistors for all audio in-signal-path applications, where possible at all. For instance, all DACT stepped audio attenuators and balance controls use resistor networks based on SMD resistors. Using SMD, the bandwidth is larger because of lower series inductance and lower stray capacitance compared to any kind of leaded resistor

Technical information from DACT
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At DACT we make use of Surface Mount Device (or just Surface Mount) components in our products.
DACT believes strongly in using SM components for high quality audio equipment. We make extensive use of Surface Mount resistors and capacitors. Compared to normal leaded resistors and capacitors, the SM counterparts are much smaller. As they have no leads, the signal path becomes significantly shorter. DACT also uses SM components because of the extremely low series inductance associated with this technology. Besides, because SM components are physically small, the layout can be very compact. This helps minimize both stray inductance and capacitance on the PCB or in the connecting wires.
Given the advantages of SM components over their leaded counterparts, it is obvious that we use SM resistors for our stepped audio attenuators. As a result, our attenuators are more compact than any that uses leaded resistor networks. And the sound? - better judge for yourself!
If you would like to study a more scientific explanation about the differences between conventional leaded resistors and Surface Mount resistors, click here.
The physical size of SM components make SM capacitors very suited as power supply bypass capacitors for active components like transistors and IC's. The SM capacitors can be placed very close to the active devices’ power supply input, in order to keep the connecting PCB trace inductance at a minimum. This improves high-frequency bypassing, reduces distortion and increases the bandwidth. Therefore, SM capacitors are used in our active preamplifier modules.

The only disadvantages using SM components are of practical nature rather than technical. For high accuracy and reliability, SM components should be mounted and soldered by machine rather than by hand. Besides, for some of the special SM components used by DACT, the component manufacturers require large order quantities. So while SM components offer technical advantages over leaded components, it requires a production of a certain scale to make it feasible to use them.

Does this look like a conventional leaded resistor?
Leaded resistor drawbacks
Guess so, because that’s what it is.
Try to click on the resistor image to see what a leaded resistor really contains.

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