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SpeakerPower Torpedo SP1-4000 Plate Amp
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<blockquote data-quote="Langston Holland" data-source="post: 31778" data-attributes="member: 171"><p>Correction</p><p></p><p>It appears that I made two errors in the SP1-4000 scope measurement from the previous (3 of 3) post:</p><p></p><p>1. The bandpass filter was engaged.</p><p>2. The amp module itself has a problem* - the other one measures perfectly.</p><p></p><p>I should not have rushed things on my way out of town prior to posting. Not only was the data wrong, but it put a bad light on a very good product from a very smart guy that is busting his butt to do the same thing we're all doing - trying to run a viable business. I sincerely apologize and will not rush things again. If I make mistakes, it'll be on purpose or due to unhurried ignorance. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>The first thing I thought would be interesting was to generate what should happen to Keele's composite stimulus using mathematically perfect filters generated in software as a reference. In the following screenshot, the first tone burst is unfiltered and the second is filtered.</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/AmpTests3/SP1-4000_Composite_Burst_NoFilter_Filter.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Maximum peak to peak voltage output of the SP1-4000 into a 4Ω TH118 load, bandpass filter bypassed:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/AmpTests3/SP1-4000_BP_Bypassed.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Maximum peak to peak voltage output of the SP1-4000 into a 4Ω TH118 load, bandpass filter engaged:</p><p></p><p><img src="http://soundscapesweb.com/files/PSW/AmpTests3/SP1-4000_BP_Engaged.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>*<em>Tried the "defective" amp today and it's fine. I think I needed to unplug it from power longer than I did yesterday (less than a minute) in order to clear the error.</em></p></blockquote><p></p>
[QUOTE="Langston Holland, post: 31778, member: 171"] Correction It appears that I made two errors in the SP1-4000 scope measurement from the previous (3 of 3) post: 1. The bandpass filter was engaged. 2. The amp module itself has a problem* - the other one measures perfectly. I should not have rushed things on my way out of town prior to posting. Not only was the data wrong, but it put a bad light on a very good product from a very smart guy that is busting his butt to do the same thing we're all doing - trying to run a viable business. I sincerely apologize and will not rush things again. If I make mistakes, it'll be on purpose or due to unhurried ignorance. :) The first thing I thought would be interesting was to generate what should happen to Keele's composite stimulus using mathematically perfect filters generated in software as a reference. In the following screenshot, the first tone burst is unfiltered and the second is filtered. [IMG]http://soundscapesweb.com/files/PSW/AmpTests3/SP1-4000_Composite_Burst_NoFilter_Filter.png[/IMG] Maximum peak to peak voltage output of the SP1-4000 into a 4Ω TH118 load, bandpass filter bypassed: [IMG]http://soundscapesweb.com/files/PSW/AmpTests3/SP1-4000_BP_Bypassed.png[/IMG] Maximum peak to peak voltage output of the SP1-4000 into a 4Ω TH118 load, bandpass filter engaged: [IMG]http://soundscapesweb.com/files/PSW/AmpTests3/SP1-4000_BP_Engaged.png[/IMG] *[I]Tried the "defective" amp today and it's fine. I think I needed to unplug it from power longer than I did yesterday (less than a minute) in order to clear the error.[/I] [/QUOTE]
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