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In the Forum: Analog Playback
In the Thread: Tell me about more about Ortofone SPU Sound.
Post Subject: Ortofon SPU loading...Posted by Romy the Cat on: 4/27/2005
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augmentin posologia
website  guy sergeant wrote: |
| On the Ortofon website those models of the SPU which don't come with inbuilt transformers, have a recommended load of >100 ohm. Using the cartridge into too low an impedance load definitely does lift the lower frequencies. Too high and the upper mid/HF is emphasised. You may want to try a little higher than 90R. I'm glad to hear you're enjoying it.... |
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Guy, using a cartridge into too lower impedance does not “lift lower frequencies” but loose HF and make LF more puffy and damped. I usually overload the cartridges until the HF begin to rolled-off but bass yet did not begin to become sound like… the absolute phase is inverted.
Ortofon unfortunately does not publish how to load the SPU. In thier site they said 47Kohm but this is, am sure, for a transformers bult-in. Probably they never publish the recommended load for their “raw” SPU cartridges because they would like people to think that SPU are identical to the Ortofon not-SPU model and consequentially people might use the default Ortofon step-up transformers. Probably it is too much for a conspiracy theorists and particularly form me – the person who it not well familiar with Ortofons.
Here is how I see it is and I do not think that it is very far from what it is. Ortofon SPU Mono is very atypically high impedance (DCR) cartridge with a lot wire inside – it is 100Ohm. The MC cartridges usually should be loaded into 2-3 times of their DCR. This would make 200R-300R an optimum impedance for SPU Mono. I ended up running it into 26dB transformer and 90K load that end up with 90K/676=133R. It is at the lower side but as I said I like to overload the cartridges and it sounds very fine to me now.
Still, despite of the “loading secrecy” that Ortofon looks like spared around this needle I very glad that I unrolled into this projects.
Rgs,
The Cat
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