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| Re: Did Martin King do something with those? [message #20937 is a reply to message #20933] |
Wed, 25 May 2005 17:30   |
Martin
Messages: 220
Registered: May 2009
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I have ten Radio Shack 1197 (blue and black boxes each marked FE 103) that I have played with a little. I have not built any formal project with them. I have a back loaded horn design for the Lowthers worked out. I upgraded my advanced MathCad worksheets to account for the real wall reflection and also front or rear firing mouth location. The paper design has a fairly flat SPL down to 40 Hz with an efficiency of 95+ dB, depending on Lowther driver, without any BSC circuit. I am working on the folding scheme now so that it fits in a reasonable enclosure. Progress on the Lowther designs has slowed some as I look into upgrading my amp and preamp. My old reliable Adcom preamp is not doing well and I am long overdue for an upgrade anyway. Martin
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| Re: Did Martin King do something with those? [message #20939 is a reply to message #20938] |
Wed, 25 May 2005 18:05 |
Martin
Messages: 220
Registered: May 2009
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Right now I am considering Bryston and Odyssey Audio. If I go Bryston, it would be most likely a BP-20 preamp and a 3BSST or 4BSST amp. If I go Odyssey, it would be a Tempest extreme preamp and a pair of Stratos monoblock extreme amps. I just need to get motivated to move towards a decision and place the order. Things have been busy at work and at home this month. Martin
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| Re: Did Martin King do something with those? [message #20941 is a reply to message #20940] |
Thu, 26 May 2005 05:05 |
Martin
Messages: 220
Registered: May 2009
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OK, lets say we start with a 200 watt amp (for 8 ohms as stated by manufacturer) into one of my 8 ohm Lowther speakers. I add a BSC circuit with an elevated parallel resistance to balance the SPL response and now the resistive load is approaching 16 - 20 ohms. If you ratio to get the power the amp will deliver, assuming that it is linear with resistance, then my 200 watt amp into 8 ohms is now an 80 watt amp into 20 ohms. This amp works well with the Lowther but suppose I am not using such an efficient driver ..... I want to be able to drive any speaker load. I like having extra power, it gives me great flexibility in my speaker designs. I am also really interested in the monoblocks since this will allow me to put the amp right next to the speaker and have a very short speaker cable. Those are some of my thoughts, Martin
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