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Lucky s.o.b.- dls accident
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<blockquote data-quote="mile098" data-source="post: 3726177" data-attributes="member: 578145"><p>ok so heres the deal, back in my country a guy wired a DLS A3 amp into a 1 ohm bridge, and it worked like that 4 about 5 months....well after that check the link as to what hapened</p><p></p><p><a href="http://www.cice.com.hr/forum/showpost.php?p=206560&amp;postcount=1" target="_blank">just look at the pics</a></p><p></p><p>so he emails dls about it and this is the email he gets back from them(if u dont feel like reading all of it just read the last paragraph)</p><p></p><p>------------I am really sorry to hear about this accident. I have studied your excellent photo documentation and I think I understand why this has happened.</p><p></p><p>- The A3 is a 1 ohm stable amplifier, or actually 0,75 ohm stable, but we normally dont recommend to load the amp so low because of the heat that this will generate. As I can guess from your photos you have connected the voice coils on each sub in parallel and then in parallel to the amplifier in bridge mode. This bridged 1 ohm load is actually a 0,5 ohm load to the amplifier. If you connect in stereo mode it is OK but bridge mode connection divides the impedance to half, meaning 0,5 ohm amplifier load. The amplifier can handle this without breaking for a short period but it will generate a lot of heat both inside the amp, and on the heatsink.</p><p></p><p>- Next problem is the placement of the amplifier between the rear seat and the sub box. The heat generated by the amp will not be able to dissapear in a correct way. Installations in narrow spaces requires external cooling by fans. I can not see that on your photos.</p><p></p><p>- I can see that the power cables are burned, this is very strange. Did you install a fuse close to the battery? This fuse has one task and that is to protect the power cables running from the battery back to the amplifier. If you have a fuse but if the value is too high, the cable can still burn without breaking the fuse. This is only a guess from my side becuse I have not seen any photo of the main fuse.</p><p></p><p>My final guess of what caused this fire is that the amplifier has been overheated inside for a long period causing the capacitors in the power supply to start to leak, and this has started the fire. It should not have happened if the amplifier was run under normal conditions, or better cooled. In the manual we have stated "Choose a location where air can circulate freely"</p><p></p><p>Regarding amplifier load we write in the manual "DLS A3 is 1 ohm stable. This means that you can connect two 4 ohm subwoofers in parallel without damaging the amplifier. Two 4 ohm subwoofers connected in parallel results in a 2 ohm load which the amplifier sees as a 1 ohm load".</p><p></p><p>To help you in the situation that has occoured we ant to send you a brand new A3 amplifier free of charge. You must promise to follow the advices regarding installation and connection in the manual</p><p></p><p>We hope that you will be satisfied with this solution -------------------------</p><p></p><p>no fail BS cuz as far as i know this shit is for real...lucky sob<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /></p></blockquote><p></p>
[QUOTE="mile098, post: 3726177, member: 578145"] ok so heres the deal, back in my country a guy wired a DLS A3 amp into a 1 ohm bridge, and it worked like that 4 about 5 months....well after that check the link as to what hapened [URL="http://www.cice.com.hr/forum/showpost.php?p=206560&postcount=1"]just look at the pics[/URL] so he emails dls about it and this is the email he gets back from them(if u dont feel like reading all of it just read the last paragraph) ------------I am really sorry to hear about this accident. I have studied your excellent photo documentation and I think I understand why this has happened. - The A3 is a 1 ohm stable amplifier, or actually 0,75 ohm stable, but we normally dont recommend to load the amp so low because of the heat that this will generate. As I can guess from your photos you have connected the voice coils on each sub in parallel and then in parallel to the amplifier in bridge mode. This bridged 1 ohm load is actually a 0,5 ohm load to the amplifier. If you connect in stereo mode it is OK but bridge mode connection divides the impedance to half, meaning 0,5 ohm amplifier load. The amplifier can handle this without breaking for a short period but it will generate a lot of heat both inside the amp, and on the heatsink. - Next problem is the placement of the amplifier between the rear seat and the sub box. The heat generated by the amp will not be able to dissapear in a correct way. Installations in narrow spaces requires external cooling by fans. I can not see that on your photos. - I can see that the power cables are burned, this is very strange. Did you install a fuse close to the battery? This fuse has one task and that is to protect the power cables running from the battery back to the amplifier. If you have a fuse but if the value is too high, the cable can still burn without breaking the fuse. This is only a guess from my side becuse I have not seen any photo of the main fuse. My final guess of what caused this fire is that the amplifier has been overheated inside for a long period causing the capacitors in the power supply to start to leak, and this has started the fire. It should not have happened if the amplifier was run under normal conditions, or better cooled. In the manual we have stated "Choose a location where air can circulate freely" Regarding amplifier load we write in the manual "DLS A3 is 1 ohm stable. This means that you can connect two 4 ohm subwoofers in parallel without damaging the amplifier. Two 4 ohm subwoofers connected in parallel results in a 2 ohm load which the amplifier sees as a 1 ohm load". To help you in the situation that has occoured we ant to send you a brand new A3 amplifier free of charge. You must promise to follow the advices regarding installation and connection in the manual We hope that you will be satisfied with this solution ------------------------- no fail BS cuz as far as i know this shit is for real...lucky sob:D [/QUOTE]
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