All in 1 portable(ish) speaker

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   I want to build a 'all in one' portable speaker using a 1 channel wondom amplifier board, a 8" or 10" speaker and a 1" tweeter, using a passive crossover. And power it with a 20ah 12v lithium battery.

The wondom amplifier board im looking at says 300w @ 40v @ 3ohm. And it says it runs from 15v-40v.  (can always change what board i use, just read good reviews on these wondom boards)

So on the dc-dc converter i assume the higher i turn up the voltage, the more power i will get out of it, but also the quicker the battery would drain. Is this correct?

If so, is there a calculation i can use to work out a good middle ground, for power to battery time ratio?

Cheers 🙂👍🏼

Edited by Jack1991 - 25 February 2022 at 6:17pm

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Jack1991 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495	Post Options Post Reply Quote Jack1991 Report Post Thanks(0) Quote Reply Topic: All in 1 portable(ish) speaker Posted: 25 February 2022 at 6:11pm
	I want to build a 'all in one' portable speaker using a 1 channel wondom amplifier board, a 8" or 10" speaker and a 1" tweeter, using a passive crossover. And power it with a 20ah 12v lithium battery. The wondom amplifier board im looking at says 300w @ 40v @ 3ohm. And it says it runs from 15v-40v. (can always change what board i use, just read good reviews on these wondom boards) So on the dc-dc converter i assume the higher i turn up the voltage, the more power i will get out of it, but also the quicker the battery would drain. Is this correct? If so, is there a calculation i can use to work out a good middle ground, for power to battery time ratio? Cheers 🙂👍🏼 Edited by Jack1991 - 25 February 2022 at 6:17pm

mr. doom Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 08 September 2010 Status: Offline Points: 266	Post Options Post Reply Quote mr. doom Report Post Thanks(0) Quote Reply Posted: 13 April 2022 at 2:23pm
	The amp will have to do "work" to consume more watts. It may make a bit more heat at idle but that should not be much. The buck convertor will consume power and waste some as heat. Depends on the converters efficiency. An amplifiers efficiency seems to be related to the load it given. Efficiency goes down with lower impedance on these chip amps when tested. Could be 85% efficient at 8oms and 70% at 2ohms. Edited by mr. doom - 13 April 2022 at 2:25pm

Jack1991 Members Profile Send Private Message Find Members Posts Add to Buddy List Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495	Post Options Post Reply Quote Jack1991 Report Post Thanks(0) Quote Reply Posted: 13 April 2022 at 6:08pm
	Cool thats interesting to know cheers man. I actually started building it. Well the speaker itself is built now, im just waiting for some other bits to arrive to test it out then fit it all inside the speaker casing. I have changed a few things since this post. Be good to get your view on it, or advice or opinions on maybe what to change or that. https://forum.speakerplans.com/portable-battery-2-way-speaker_topic106952.html Edited by Jack1991 - 13 April 2022 at 6:09pm