First 12v sound system plans |
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 491 |
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Posted: 08 February 2020 at 8:39pm |
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What im planning so far: Tham12 loaded with; 1x 12" the box speaker 12-280/8W Power capacity: 280 W RMS Impedance: 8 Ohm Mid/Top: Mid = 1x 10" the box speaker 10-250/8-A Power rating: 250 W RMS Impedance: 8 Ohm SPL: 94 dB (1W/m) Top = 1x Eminence ASD1001 RMS: 50W Usable Frequency Range 2.5 kHz - 20 kHz Recommended Crossover 2.5 kHz / 18 dB SPL: 104 dB Passive Crossover = Eminence PXB2-2K5CX Amplifier: 1x Pioneer GM-D8704 Class-D 1200w 4-Channel bridgeable Bridged = 2x 300w rms @ 4ohm I was thinking of bridging 2x channels for the Sub and bridging 2x channels for the Mid/Top too. Look forward to any advice, thanks! š
Edited by Jack1991 - 28 February 2020 at 5:41pm |
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Xoc1
Registered User Joined: 15 October 2012 Location: Devon UK Status: Offline Points: 397 |
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The Box Speaker 12 looks good in a Tham 12 sim. If the parameters I found can be trusted Midrange efficiency will be important. Maybe consider a 12" mid for better efficiency. If you are thinking of sticking with the Eminence APT then the crossover frequency is 3.5K. The Eminence 3.5K crossover is a reasonable match.
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 491 |
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Yes ive heard on another forum a good few people said it works great in there tham12.
Okay cool ill check out the Eminence crossover now thanks! I do like the look of the Eminence top so would like to use it yeh. I was leaning more towards the fane 8" more than the 10" but you think i should go 12" mid instead? With passive crossovers are they litterally "plug and play" as in solder Mid and Top to it and then connect the crossover to the amp. Or do they need tuning and stuff to get them right? Im new to all this so trying to get the correct info before i begin.
Edited by Jack1991 - 09 February 2020 at 4:56pm |
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APW
Young Croc Joined: 13 November 2012 Location: Kent, UK Status: Offline Points: 1173 |
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The Fane Sov 8-225 is fairly efficient (@ 97db/w) and in the right box can meet the Tham, I have a friend who has a couple of fanes in the 18-sound 8ā suggested designs āapplication noteā enclosures that he uses with a couple of Thams, the whole thing sounds quite sweet. The Eminence crossover is OK, however you are going to need an 7-8db l-pad between the crossover and APT150s due to the difference in sensitivities. FYI: http://www.eighteensound.com/en/resources/suggested-designs/ |
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 491 |
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Ah right cool thats good to hear! Ill check that out now as im still stuck with enclosure choice.
Oh okay i didnt know you should match the sensitivitys of each speaker too. Should i be matching the sensitivity of the Sub, Mid and Top really? Or just the mid top as they are linked together via crossover and in the same box. Also why do the sensitivities need to be matched? Is it so they all sound equal i assume? Thankyou! ššš¼
Edited by Jack1991 - 09 February 2020 at 9:14pm |
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Mikkel
Young Croc Joined: 17 May 2013 Location: Huddersfield Status: Offline Points: 549 |
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Hey. i dont know about what youve seen online but the sim im getting for the 12-280/8-w in tham12 doesnt look so good to me. theres a 3dB drop from 60hz hump down to ~100hz. Dont have computer connected to internet so cant post up sim, will do later in week when get home if your interested.
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concept-10
Young Croc Joined: 17 May 2016 Status: Offline Points: 1292 |
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Nothing is very flat from 60-100 in the tham 12 when simmed, in the real world that driver is ok with some slight eq if need be, for a 12volt system it will be fine.
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Mikkel
Young Croc Joined: 17 May 2013 Location: Huddersfield Status: Offline Points: 549 |
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Fair enough, reason is ive been designing my own tapped pipe for that driver for my own 12v idea and the tham was an obvious candidate but was put off by poor performance. Good to know anyway.
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concept-10
Young Croc Joined: 17 May 2016 Status: Offline Points: 1292 |
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It works well in the MTH-30 and some BFM designs as well, for the money you can't go wrong, good luck with your project
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Mikkel
Young Croc Joined: 17 May 2013 Location: Huddersfield Status: Offline Points: 549 |
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Nice one, cheers.
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Jack1991
Registered User Joined: 05 February 2020 Location: Bristol Status: Offline Points: 491 |
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Any advice on the reducing tweeters sensitivity db? I dont really get the L-pad idea. Is this a crucial step or something only a "audiophile" would pick up on. Tweeter: 107db Mid: 95db
Edited by Jack1991 - 10 February 2020 at 11:10am |
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APW
Young Croc Joined: 13 November 2012 Location: Kent, UK Status: Offline Points: 1173 |
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I wouldnāt worry about having higher sensitivity on the bass; you are bi-amping so you can turn the bass down slightly on the amp if itās too muchā¦ however the system will sound āfullerā having a 3 to 6db extra on the bass. If you are using DSP you CAN EQ the HF out and/or using separate
amps to drive the comp/tweeter, however as you are going to use a passive crossover
itās better to use an l-padā¦ The l-pad is simply two large resistors that
reduce the tweeters output but maintain the correct impedance that the
crossover sees, without it you will have way to much HF from the tweeter, the
result will be a speaker system that you can cut peopleās heads off with!! L-Pad calculator: http://www.mh-audio.nl/Calculators/att.html Depending on your MF driver you may also need a Zobel network; however I seem to remember the 8-225 doesnāt need one to sound OK. A zobel is a RC network that is placed across the woofer, this corrects for the rising impedance with frequency curve that a woofer has due to the VC inductance, in some instances this messes with the crossover point as passive crossovers are designed to work in to a specific impedance. Edited by APW - 10 February 2020 at 11:12am |
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