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Strange frequency behavior of new installation
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<blockquote data-quote="cartraveller" data-source="post: 8711423" data-attributes="member: 680513"><p>Okay, I have made some progress! And some new questions <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><strong>The progress: I can do input summing!</strong></p><p>I'm a lucky guy! My Mosconi has also the capability to sum signals. They call it 'input mixer'. Unfortunately, no input EQ (I should have bought the more advanced model for that). I have tested it, and it works! <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><strong>The new problem</strong></p><p>But it seems that I have also found a new problem. The original tweeters had a very simple filter attached to it (a single capacitor). It seems that the new tweeters have no filter at all. So the tweeters are now without any form of filtering / protection. After summing the two input signals, more bass will be directed to the mid unit (and thus also to the tweeter). As a short recap: my system is a combi of active / passive. The lows have separate amplifier and the mid/high have a separate amplifier (4 channels in total): </p><ul> <li data-xf-list-type="ul">Low signal from head unit >>>>> Mosconi input channel 3+4 >>>> output channel 1+2+3+4 (with input summing)</li> <li data-xf-list-type="ul">Mid/low signal from head unit >>>>> Mosconi input channel 1+2 >>>>> output channel 1+2+3+4 (with input summing)</li> </ul><p>So my questions:</p><ul> <li data-xf-list-type="ul">I know that exposing the tweeters to a full range signal can result in blown up tweeters. If I would filter the mid/high signal in the amplifier and set the crossover to 250 Hz, would that be safe for the tweeters?</li> <li data-xf-list-type="ul">I think not having a filter between mid range and tweeter will not result in good sound quality?</li> </ul><p>I have attached the original input signal after summing. The mid range is Gladen Zero Pro 80 - not the 130 as I thought! - (<a href="https://www.hifimotive.nl/files/products/f85454e8279be180185cac7d243c5eb3.pdf" target="_blank">https://www.hifimotive.nl/files/products/f85454e8279be180185cac7d243c5eb3.pdf</a>) and the tweeters are Exact HX 20 (<a href="https://www.hifimotive.nl/files/products/f73b76ce8949fe29bf2a537cfa420e8f.pdf" target="_blank">https://www.hifimotive.nl/files/products/f73b76ce8949fe29bf2a537cfa420e8f.pdf</a> .... unfortunatly, not in English)</p><p></p><p>My last questions: </p><ul> <li data-xf-list-type="ul">Two very strange dips in the profile. Is this also filtering from the head unit, the acoustics of the car of something else that is going on?</li> <li data-xf-list-type="ul">What would be the logical crossover point between low and mid/high in your view? </li> </ul><p>Thanks for your support and knowledge sharing!!! So much appreciated!!</p></blockquote><p></p>
[QUOTE="cartraveller, post: 8711423, member: 680513"] Okay, I have made some progress! And some new questions :) [B]The progress: I can do input summing![/B] I'm a lucky guy! My Mosconi has also the capability to sum signals. They call it 'input mixer'. Unfortunately, no input EQ (I should have bought the more advanced model for that). I have tested it, and it works! :) [B]The new problem[/B] But it seems that I have also found a new problem. The original tweeters had a very simple filter attached to it (a single capacitor). It seems that the new tweeters have no filter at all. So the tweeters are now without any form of filtering / protection. After summing the two input signals, more bass will be directed to the mid unit (and thus also to the tweeter). As a short recap: my system is a combi of active / passive. The lows have separate amplifier and the mid/high have a separate amplifier (4 channels in total): [LIST] [*]Low signal from head unit >>>>> Mosconi input channel 3+4 >>>> output channel 1+2+3+4 (with input summing) [*]Mid/low signal from head unit >>>>> Mosconi input channel 1+2 >>>>> output channel 1+2+3+4 (with input summing) [/LIST] So my questions: [LIST] [*]I know that exposing the tweeters to a full range signal can result in blown up tweeters. If I would filter the mid/high signal in the amplifier and set the crossover to 250 Hz, would that be safe for the tweeters? [*]I think not having a filter between mid range and tweeter will not result in good sound quality? [/LIST] I have attached the original input signal after summing. The mid range is Gladen Zero Pro 80 - not the 130 as I thought! - ([URL]https://www.hifimotive.nl/files/products/f85454e8279be180185cac7d243c5eb3.pdf[/URL]) and the tweeters are Exact HX 20 ([URL]https://www.hifimotive.nl/files/products/f73b76ce8949fe29bf2a537cfa420e8f.pdf[/URL] .... unfortunatly, not in English) My last questions: [LIST] [*]Two very strange dips in the profile. Is this also filtering from the head unit, the acoustics of the car of something else that is going on? [*]What would be the logical crossover point between low and mid/high in your view? [/LIST] Thanks for your support and knowledge sharing!!! So much appreciated!! [/QUOTE]
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