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nilspixel
Registered User Joined: 02 March 2021 Status: Offline Points: 77 |
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Posted: 23 August 2021 at 5:03pm |
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Some time has passed since i started my 12v project. Afterall it's an ongoing constant learning process :) What i came up with so far: 2x THAM15 with PD 15.50 8Ω 600W RMS 2x Self-designed 12" Cabinets with Emince Delta Pro 12A 8Ω 300W RMS 2x Fairly Cheap Sica z009442 +Q07032B in self built cabinets AES Power 16 W above 3 kHz Program Power 32 W above 3 kHz Sensitivity 105.5 dB (Q07020A) Frequency Range 1000 Hz ÷ 19 kHz (Q07020A) Recomm. Xover Frequency above 2500 Hz 1x GreenCeel 12V 90AH AGM Battery 1x Pioneer GMD 8740 4x100W Rms 4Ω 2x300W RMS 4Ω 1x 4x4 DSP t.rack The setup looks something like that. every speaker is wired in parallel so they are 4Ω. Watts: Thams get 150W each Mids get 50W each Highs also 50W each Pro:
Con:
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Edited by nilspixel - 27 August 2021 at 2:53pm |
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 495 |
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Looking good mate! How do you find towing it by bicycle is it hard work?
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nilspixel
Registered User Joined: 02 March 2021 Status: Offline Points: 77 |
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thanks mate! Its fine on flat streets. When it comes to hills its quit hard without ebike power. Fortunately i have a motor on my cycle ;)
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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Given you achieve 150W out of your current amplifier then the increase to 450W is a decent 5dB more. You'll be much closer to justifying such a chonky driver at that point.
There's another 4dB available if you had a horn extension, equivalent to a 1100W amplifier at that point, without the extra power consumption. Could fold it up and 'deploy' when wanted. Also, I'm sure you've checked - but given the overlap currently between your mids and the Thams, the phase is well worth getting dialled in. Given the SPL you'll be at, the 4554 is likely overkill - but it sounds great!
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nilspixel
Registered User Joined: 02 March 2021 Status: Offline Points: 77 |
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Yes, i think i go for this Eton Amp. Does someone has experience on running two amps from one battery?
Horn extension sounds good, is there any information to be found?
yeah, thats back from when i was doing some weird experiences... :D
You mean smaller ones fit better? Edited by nilspixel - 26 August 2021 at 4:03pm |
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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Tapped horns (and other horns) need some consideration for a horn extension to ensure the internal flare rate is maintained, and the driver offset created isn’t going to cause a horrible notch in the response by pushing it out of 1/4 lambda. You can however get a fairly good ~3 dB broadband increase with any stack of subwoofers by making a portable baffle extension that increases the cabinets’ combined frontal area to 3 times the original value. Some flat pieces of 18 mm or greater thickness wood with fold-out outriggers do the job just fine, especially if they’re braced at the back to reduce resonance. https://www.diyaudio.com/forums/subwoofers/184986-horn-extender-wave-guide-th.html This is, of course, at the expense of omnidirectional bass coverage - may or may not be a good thing for a portable battery system. You can even put a logo or some art on them. Edited by toastyghost - 26 August 2021 at 3:55pm |
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Phil B
Old Croc Joined: 21 November 2004 Location: Melbourne Status: Offline Points: 2328 |
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Horn extensions on TH.... yep...
https://forum.speakerplans.com/th-unity-horn-24v-solar-sound-system_topic63191.html .p. |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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I tried tempting Jack quite a bit in this thread! http://https://forum.speakerplans.com/lockdown-audio-a-12v-3way-small-rig-build_topic105202_page1.html
I would be happy to strap together a basic sim to show the size with an extension, but I am far from an acoustic engineer. I'd be more than happy to help with the mechanical design though. Re. 4554 - it's a 1.4" designed to do 1kHz+ at high SPL (which you will never reach, being heavily limited by the THAMs) Better IMO to go with a 1" driver such as BMS 5530ND mated to a PH-3220. Cheaper drivers are available such as B&Cs 1"ers. That combo is both cheaper, sweeter in the HF, better horizontal dispersion and over 2Kg lighter
Edited by infrasound - 27 August 2021 at 3:52pm |
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nilspixel
Registered User Joined: 02 March 2021 Status: Offline Points: 77 |
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thanks for your explanation ;) i will consider it for my future plans! can someone say something about Stetsom preamps? they seem to be fairly cheap for a lot of power.. i don't trust them for now.. what they state: Power @ 12.6V Bridge 4 Ohms1 x 1000W RMS Harmonic Distortion 0,4%... quit high isn't it? another one, perfectly matches my 600W RMS Power @ 12.6V Bridge 4 Ohms2 x 600W RMS Harmonic Distortion 0,9%.....(???) Edited by nilspixel - 27 August 2021 at 3:03pm |
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infrasound
Old Croc Joined: 13 May 2011 Location: Brizzle Status: Offline Points: 2276 |
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I only know a little of car amplifiers, but those small Brazilian amps (don't know why specifically Brazil) have a particular reputation (I hear) for over-inflating their specifications. If you can find someone who's actually benched some, might be your best bet. Perhaps trawling some car audio forums / YT. Although, arguably efficiency is just as important - but that data is far harder to come by. Maybe the only thorough approach here could be to buy a few, run 1/6 pink noise through them to match SPL and measure their power consumption. Not a quick answer though.
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nilspixel
Registered User Joined: 02 March 2021 Status: Offline Points: 77 |
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yesterday evening i realized that at a higher volume you hardly feel bass anymore. do the thams get outplayed? is it a power problem? i forgot to mention that for now i only have one 15" installed because of delivery delays... --------------------------------------------------------------------- Found some nice informative videos for calculating all that power needs within a system... its really basic but i needed someone to explain it to me :P So idealy lets say i run on 14,4 Volts (maybe with some power adapter in the future). Lets say i use a Rage 1200.2 and my Pioneer 8704: 1200W/14,4V = 83,34A/0,8 =104,2A 600W/14,4V = 41,7A/0,8 = 52,1A Both 1200Watts RMS + 600Watts Rms at 14,4V = 1800W 1800W/14,4V = 125 A 125A/0,8 = 156,26 ASo my powersurce should be able to do that.. Edited by nilspixel - 28 August 2021 at 1:19pm |
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bob4
Old Croc Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1843 |
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The empty cab might eat some of your output......
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