NEW - Zero Reflection Termination Network (ZRTN) for use with speaker cables, now available from DNM.The DNM speaker cable ZRTN
is a series and parallel design for use with DNM Stereo Resolution Speaker cable and DNM Stereo Solid Core Precision speaker cable.Note : you can save £100 + VAT if you wish to part-exchange one pair of speaker cable HFTNs for one pair of ZRTNs - just buy the next product on this page.We strongly recommend ordering your ZRTNs with two short cables (made up by DNM Design) to connect to your amplifier - these are shown as LINK CABLES below and versions with 2mm/ 4mm/ spade/ bare wire terminations are available plus a choice of DNM Resolution or Precision 2 cable. These link cables are soldered directly to your ZRTNs for the best connection quality.
The photograph at the top of this document shows how each speaker cable ZRTN of a pair is supplied by DNM Design.
The pair of ZRTNs is fitted with 4mm speaker sockets as standard but can be soldered directly to speaker cables ordered at the same time if this is preferred. Each ZRTN measures 29mm high by 85mm wide.
You need only one pair of ZRTNs for a normal amplifier but two pairs are needed for a balanced output amplifier - more details in the "Full ZRTN fitting and connection information" PDF linked below.
The ZRTN is series/parallel connected to the speaker cable - part of its network is in series with the cable and part is in parallel. This enables the ZRTN to precisely control the cable's termination impedance, eliminating external interference with the amplifier's feedback system. The ZRTN is purpose-designed to be fitted close to the amplifier and it gives a very substantial performance improvement.
The exploded view of the ZRTN PCB group above shows that it requires a complex assembly of parts to achieve very high performance filtering at very high frequencies.
When assembled the ZRTN boards fit together in a tightly packed stack of 4 layers which is 8.4mm thick.
The two inner layers are each 2.4mm thick double sided, thru-hole plated with gold plated surfaces and extra heavy copper. These boards are intricately shaped to hold the four 4mm sockets and accept copper inserts to enable 25 amp continuous current handling capacity.
The two outer layers are used as component covers, one of them takes six press-in 3mm self-clinch nuts that allow the whole assembly to be held together.If AIRSURE shipping is available to your country (or Special Delivery in the UK), we strongly recommend using it when buying ZRTNs, for faster, tracked, more reliable delivery with better compensation for lost goods.
If in doubt about what to order (for example if you need an odd number of Speaker cable ZRTNs or if you are unsure about postage), please email DNM Design or use the Contact Us button at the top of this page.Full ZRTN fitting and connection information
(Connecting just a pair of HFTNs initially)