The Chainlink


Bike Sound

Dingy bells, squealing brakes, air hissing out of tires . . . no wait, this group is about mobile sound systems.

Members: 45
Latest Activity: Jun 11, 2019

Discussion Forum

Wanted to buy - sound system that fits in milk crate 3 Replies

Started by willow naeco. Last reply by Dean Bekken Apr 7, 2015.

Boom Bike 4.0 Shopping List 31 Replies

Started by Spencer "Thunderball" Thayer!. Last reply by Jimmy Miller Oct 16, 2013.

Shorai Batteries 1 Reply

Started by Matt. Last reply by h' Zerocats Jul 5, 2013.

Boom Cases 4 Replies

Started by Matt. Last reply by Gort 12-mile Pinklegneep May 18, 2012.

Syncing mobile sound systems-- best solution yet 17 Replies

Started by h' Zerocats. Last reply by h' Zerocats Jun 28, 2011.

Bike sound component givaway

Started by Brendan May 30, 2011.

Power Is Out? 11 Replies

Started by Matt. Last reply by Matt May 23, 2011.

Speakers? 12 Replies

Started by Matt. Last reply by Matt May 10, 2011.

Any reasonably affordable way to get into lithium batteries? 7 Replies

Started by h' Zerocats. Last reply by Spencer "Thunderball" Thayer! May 5, 2011.

building a bike sound system.... 4 Replies

Started by Josh. Last reply by Fat Tire Frank Apr 7, 2011.

Comment Wall


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Comment by Todd Allen on June 25, 2011 at 10:15pm

Matt, batteries of differing voltages and differing capacities may be used without trouble in series so long as one stops as soon as the lowest capacity battery is discharged.


In parallel batteries of differing capacities can be used together so long as they are all of the same voltage and of an appropriate chemistry.  Don't parallel connect batteries types that exhibit a voltage drop at the end of the charge curve such as nimh or nicad. 


And it's not just the faceplate voltage, but the actual state of charge which should match.  ie, don't connect a fully charged 12 volt battery to a significantly discharged one or you might get fireworks.


Once slight downside of parallel connected batteries is that if one goes bad it will likely destroy all the connected batteries. Thus it is usually recommended to use batteries of a similar age or at least not connect a very old battery on its last legs to several fairly new ones.


Finally some lithium batteries contain integrated electronic BMS units.  The BMS must be designed for parallel connections or you may have trouble such as one or more BMS's going up in smoke when approaching full charge or full discharge.

Comment by Matt on June 24, 2011 at 10:23pm
I get that it is bad to run batteries of differing voltages in series or parallel, but would there be consequences to running batteries of different amp hour ratings in parallel? 

For my purposes, I managed to come across a second Shorai 12V/7Ah battery that I would be interested in running in parallel with my 12V/18Ah battery. Would this be a terrible idea?
Comment by h' Zerocats on June 15, 2011 at 3:03pm

I read those. Different application, small sample.

Ask Alex. I like 'em in principal because they're so compact.  They pretty much have to be class D at that size, meaning they'll have a good run time as well. I would not expect to get even 1/5 of the advertised output though.

Comment by Spencer "Thunderball" Thayer! on June 15, 2011 at 1:29pm
Terrible user rating. Why use it?
Comment by Matt on June 15, 2011 at 10:45am
Thanks H and Alex. Looks nice and light, but is it class D?
Comment by h' Zerocats on June 15, 2011 at 8:34am
Comment by Matt on June 14, 2011 at 3:45pm

They sounded great! Since I was standing near Todd prior to the ride, I was wondering if that was you. :)

Comment by Spencer "Thunderball" Thayer! on June 14, 2011 at 12:02pm
I'm just the trailer away from being finished. Matt, the PA speakers I was rocking the lot during the Pre/Post Naked Ride are the ones going on the trailer.
Comment by h' Zerocats on June 14, 2011 at 12:39am

Sorry, I can't figure out which one it is. I thought he posted it here.

It was cheap ($80?)  and very compact.

Comment by Matt on June 14, 2011 at 12:20am
I also had the Shorai at the Memorial Day ride. I recall showing it to you. I keep it in a small rubbermaid container that I used to store rye bread in.

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