The Boominator - another stab at the ultimate party machine

[Phaedras]

Originally Posted by Saturnus

Vb 25 liters (driver is smaller and takes up a lot less room) and Fs 82Hz.

How would you compare the Basslite s2010+pht407 to the SN10-MB+pht407?

Less sensitivity I reckon, but would the difference in quality be miniscule?

[Saturnus]

SNII10MB more detailed and more natural midrange. S2010 more warm but more pressed in upper midrange.

Sensitivity is more or less identical with 2dB more than the HP10W or GW1058.

[Phaedras]

Originally Posted by Saturnus

SNII10MB more detailed and more natural midrange. S2010 more warm but more pressed in upper midrange.

Sensitivity is more or less identical with 2dB more than the HP10W or GW1058.

Hmm, seems like its not a lot gained from the somewhat higher price of the SNII10MB over the basslite s2010.. I might consider using the Basslite if im building a signature sometime during the winter

Been looking in to the miniDSP aswell - what a cool little thing it is.. Can't wait to dig in and try it out!

And ofcourse, i'm going for some lifepo4 cells and 24v! I seem to recall you saying that the Amp9 used around 35w in 4ohm running at 24v? That would give me around 25-30 hours of playtime on a 24v 40Ah lifepo4 battery? Quite decent for the added spl and sound quality!

[Saturnus]

Originally Posted by Phaedras

And ofcourse, i'm going for some lifepo4 cells and 24v! I seem to recall you saying that the Amp9 used around 35w in 4ohm running at 24v? That would give me around 25-30 hours of playtime on a 24v 40Ah lifepo4 battery? Quite decent for the added spl and sound quality!

Probably less since the tweeter channels won't have nearly the same average output as the woofer channels, maybe around 28W total but probably even less than that because you also have to consider than the tweeter only needs half the output of the woofer channels (97dB sensitivity for the woofers and 100dB sensitivity for the tweeters). I'd actually estimate around 48 hours running time (at max volume).

[Campino Morten]

Originally Posted by Phaedras

Been looking in to the miniDSP aswell - what a cool little thing it is.. Can't wait to dig in and try it out!

And ofcourse, i'm going for some lifepo4 cells and 24v! I seem to recall you saying that the Amp9 used around 35w in 4ohm running at 24v? That would give me around 25-30 hours of playtime on a 24v 40Ah lifepo4 battery? Quite decent for the added spl and sound quality!

I'm also going to use AMP9B but with 2*12V and a switch to choose between 24V and 12V for power saving, when it's not necessary to play at max. I also think it's nice to have a 12V output for various chargers etc. And the option to "add a 12V external car battery if the internal batteries run low.

Have you found some LFP batteries that I haven't? If you can fit 2*12V 40Ah or 1*24V 40Ah into the middle compartment, your batteries got a way better size than mine, or just a much bigger compartment.

[Phaedras]

Originally Posted by Campino Morten

I'm also going to use AMP9B but with 2*12V and a switch to choose between 24V and 12V for power saving, when it's not necessary to play at max. I also think it's nice to have a 12V output for various chargers etc. And the option to "add a 12V external car battery if the internal batteries run low.

Have you found some LFP batteries that I haven't? If you can fit 2*12V 40Ah or 1*24V 40Ah into the middle compartment, your batteries got a way better size than mine, or just a much bigger compartment.

Im doing something like that aswell.. Its easy to make a switch to change from serial connected to parallel for more batterytime when not playing loud

I'm still in the early stages of my design, thinking about doing something completely different with the battery, but im still considering my options.. I did find a 24v 30Ah lifepo4 battery which is 300x105x150 mm in size.. not completely hopeless to fit in a middle compartment, however, not in the standard size

Edit: I discarded that battery as it was shipped from Hong Kong and with danish toll and tax i'd would be too expensive.. I might go with some 3.2v 40Ah cells from ev-power.eu.. But I havent settled on a design yet

[Campino Morten]

I would consider taking a step down in Ah. The price of 8*3,2V 40 Ah is 376 EUR without shipping. They are hard to stack unless you change the 300*300 design, and the weight will also be quite big.
I would like to know if you find a great solution that I can steal.

For now, my plans are to have below 20 Ah. I just want enough power for at least a day of music (not all time at max.) I don't want the weight to be to high for one man to carry.
If you are going to be away for longer than that, then it's likely that you have some kind of transport, where you can also store spare batteries.
If we are talking festival use, then we have an (almost) unlimited supply of 12V 60+Ah GEL batteries and a 70W solar-panel to power the camp/boominator.

I haven't settled on a type of batteries yet but they are definitely going to be sealed, and not standard lead batteries as in one of the first designs of the boominator. :P

Good night, sleep tight.

[Saturnus]

While not ideal. Li-ion packs could also be an idea. They hold a much higher capacity in a smaller package but there are some short-coming.

Firstly, they're 11.1V average (3x 3.7V Li-ion cells) and has to be charged with either a dedicated charger or constant voltage at 12.6V. Not higher under any circumstances, and lower means you won't get full capacity, so you can't connect them directly to solar cells for instance.

You could easily get 12V 72Ah or 24V 36Ah in the same volume as 2x 12V 7.2Ah SLA batteries. It'll weigh about the same though but it about 5 times the capacity in the same battery space.

4 of these 12V 18000mAh Super Rechargeable Lithium-ion Battery EMS | eBay would do it but it's gonna cost a pretty penny.

That's about 133 hours on max volume on 12V setting or 33 hours on max volume on 24V setting without any change in the original design.

[valtzu]

Originally Posted by Saturnus

4 of these 12V 18000mAh Super Rechargeable Lithium-ion Battery EMS | eBay

I'm sure that's not the real capacity. Maybe a half of it.

[Saturnus]

Originally Posted by valtzu

I'm sure that's not the real capacity. Maybe a half of it.

Yeah. It would be pretty incredible if they could go over the theoretical limit of li-ion's capacity. Li-ion's have at max 160wh/kg. This apparently has 205 wh/kg which is obviously not possible. 2/3rd is possible and likely though. Doubt it's down to half.