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<blockquote data-quote="Robert Baverstock" data-source="post: 55739" data-attributes="member: 1738">Re: Uli Behringer of The Music Group Q&amp;AHi Bennet, I guess you shot me down in flames, thanks for the insight, Ive never done these types of calculations before. You say this but some people say how much better the bass sounds comparing one amp to another, maybe some of it&#039;s the front end, some the output stage and some is the power supply, which to me would be the most important thing to consider - the stiffness and filtering of the power supply seams to be the most important factor. I&#039;ve never got around to using them but a few years ago I bought some Yamaha subwoofer speaker processors using their YST system for some double 18&quot; subwoofers they made years ago ( I don&#039;t exactly remember the model number but YST30 rings a bell). I think it involves using a low value resistor in series with the subwoofer ground side and some filtering and negative feedback, as far as I know it negates cable resistance and provides better control over the voice coil. I remember a similar idea being published in an electronics magazine many years ago. I realise the filters and maybe gains would need to be changed in these processors to make them work properly, maybe I&#039;ll get around to experimenting with them someday. I beleive Nexo and one or two others have use a similar system. Unfortunately as far as I know it&#039;s one amp one speaker with the system so with the two Ive got I&#039;d be able to run a pair of double 18&#039;s. From what I know the drivers would have to have a low Qts value, ie 0.26 or lower to work at it&#039;s best. Regards, Rob</blockquote>

[QUOTE="Robert Baverstock, post: 55739, member: 1738"] Re: Uli Behringer of The Music Group Q&A Hi Bennet, I guess you shot me down in flames, thanks for the insight, Ive never done these types of calculations before. You say this but some people say how much better the bass sounds comparing one amp to another, maybe some of it's the front end, some the output stage and some is the power supply, which to me would be the most important thing to consider - the stiffness and filtering of the power supply seams to be the most important factor. I've never got around to using them but a few years ago I bought some Yamaha subwoofer speaker processors using their YST system for some double 18" subwoofers they made years ago ( I don't exactly remember the model number but YST30 rings a bell). I think it involves using a low value resistor in series with the subwoofer ground side and some filtering and negative feedback, as far as I know it negates cable resistance and provides better control over the voice coil. I remember a similar idea being published in an electronics magazine many years ago. I realise the filters and maybe gains would need to be changed in these processors to make them work properly, maybe I'll get around to experimenting with them someday. I beleive Nexo and one or two others have use a similar system. Unfortunately as far as I know it's one amp one speaker with the system so with the two Ive got I'd be able to run a pair of double 18's. From what I know the drivers would have to have a low Qts value, ie 0.26 or lower to work at it's best. Regards, Rob [/QUOTE]

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