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24V amp with MaxxBass + MiniDSP build |
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RockBottom 
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Joined: 09 February 2018 Location: az Status: Offline Points: 3 |
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 Topic: 24V amp with MaxxBass + MiniDSP buildPosted: 12 February 2018 at 1:58am |
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I'm not interested in a 107, just the 103. I have a MaxxBass BCL which is a real monster. This is for my car and a 107 wouldn't work for me. Let me know.
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snowflake
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Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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Posted: 11 February 2018 at 7:46pm |
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I've got Maxxbass 103 and several 107. Need to check this on the 103 but one thing I noticed on the 107 is that it behaves very differntly depending on the input signal. At low volumes it acts as an eq and adds a lot of LF signal. Only at high volumes does it cut the low frequencies and add lots of harmonics. So you need to make sure that you gain structure is set up so that at high volumes the signal through the Maxxbass is at maximum level.
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bitSmasher
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Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2295 |
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Posted: 11 February 2018 at 10:35am |
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A bit embarrassing to see this thread again, knowing I haven't gone near this project
 That said I have decided to stick with straight 24v from battery to amp, reason being is I've picked up a few solar panels and 12/24v charger... so a simple, efficient and light system will be the goal And sorry, not selling the MaxxBass any time soon! |
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https://www.instagram.com/batteryacidsoundsystem/
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studio45
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Joined: 16 October 2007 Location: United Kingdom Status: Offline Points: 3864 |
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Posted: 10 February 2018 at 4:24pm |
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I've been running a system using Sure 2x300w modules and 500w boost converters for a couple of years now without any problems. I boost up to +48v. The boost converters are very well built and don't seem to have any problem being permanently wired to the amp module, no issues with inrush current.
I know Doppler also used that system once upon a time and gave it many "hot suppers", leading to the discovery that although the switching MOSFET can blow, it is easily and cheaply repairable, and doesn't tend to take the controller IC with it ;) They do however have a low voltage cutoff at about 11v, which means that if you are using lead acid batteries on any reasonable length of cable you can have problems getting the last few % out of the battery, since any appreciable voltage drop in the cable can make the boost converter shut down even if the battery voltage is still over 11.8v. Ditto if your batteries are tired and suffering from increased internal resistance, leading to voltage sags. I run 4s Lipo packs now so my voltage window is 16.2 --> 12v, so the supply never sees less than 12v. |
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Studio45 - Repairs & Building Commotion Soundsystem -Mobile PA
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RockBottom
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Posted: 09 February 2018 at 8:11pm |
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If you still have a MaxxBass 103 available I want one.
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RockBottom
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Posted: 09 February 2018 at 8:11pm |
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Do you still have a MaxxBass 103 available? If so I want one.
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slaz
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Joined: 27 November 2009 Location: London E2 Status: Offline Points: 2713 |
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Posted: 19 January 2017 at 12:04pm |
DC-DC converters like this can maybe work well, but can also cause complications. Unless there's some kind of soft-start going on, it can draw really high inrush current ar startup. One I had would go into protect/shutdown straightaway if the load (amplifier) was connected (as the amplifier itself itself also draws inrush current). I favour keeping things simple as possible .... I'd vote for using the 2 x 12V in series and maybe using another battery to power your "outboard" gear. I've used the naff "CCTV LiPo batteries" to power a small 12V DC DJ mixer (200mA or so) and sometimes a car 7-band equalizer (another CCTV battery) - also about 200mA - lasts the whole day with zero problems. a) It takes a bit of load off main batteries b) It neatly sidesteps any earth-loop type problems and any other hard-to-diagnose issues. c) Really minimal size/weight OK - it means remembering to charge em etc. .... but I reckon its worth it. |
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REMEMBER....POLITICIANS AND DIAPERS SHOULD BE CHANGED OFTEN AND FOR THE SAME REASON
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bitSmasher
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Joined: 23 June 2012 Location: Melbourne Status: Offline Points: 2295 |
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Posted: 19 January 2017 at 11:36am |
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I'm pretty sure that style of "Bass Boost" is just a big parametric bump in the bottom end
The MaxxBass actually high passes, and creates fundamentals - different approach, more more speaker and power friendly When I eventually get time to start playing around and posting a blog, measuring the MaxxBass will be one of the first things I do. Will be interesting to see the result
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https://www.instagram.com/batteryacidsoundsystem/
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_djk_
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Joined: 23 November 2004 Location: United States Status: Offline Points: 6002 |
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Posted: 18 January 2017 at 7:21pm |
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djk
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bitSmasher
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Posted: 18 January 2017 at 8:45am |
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Thanks for reviving the thread! This project has stalled, work and life went a bit silly over Christmas  The more I think about it, this make more sense, and I've already checked out the Sure option: 500W BOOST Converter for CAR Audio - TL494 Losing a bit of efficiency is OK, when it keeps things flexible Will buy one and see how long it takes for me to get this together |
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https://www.instagram.com/batteryacidsoundsystem/
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jerronimo
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Posted: 17 January 2017 at 1:13pm |
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Maybe it's a good idea to use a step-up converter for the Sure amp, as ideal input voltage for full power is 30V.
Your batteries will have a nominal voltage of 23,76 volts when ''empty'' and 25,8 volts when fully charged, so the Sure amp will never ''see'' the full 30V on it's input rail. Another option would be to run the batteries in parallel on 12 volts, so no need for a step-down converter and only use the step-up converter for the Sure amp.
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Sapro2
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Posted: 05 December 2016 at 3:51pm |
I too can vouch for that. I use one in Baby Sham. Mine doesn't squeek when i turn it on though. |
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Splat Soundsystem
Baby Sham pram Soundsystem Sapro - SoundCloud https://soundcloud.com/sapro DJ Sapro. West country free party DJ and Producer. |
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bitSmasher wrote: