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Getting a warm sound? (with simulations) |
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hi grade 
Young Croc 
Joined: 18 June 2008 Location: manchester Status: Offline Points: 965 |
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 Posted: 28 December 2022 at 9:01am |
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I think jon from rc1 on this forum might have some ca18 for sale if you send him a message
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bob4
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Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1843 |
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Posted: 28 December 2022 at 10:24am |
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Axel, you need to put things into perspective. There is no single best amplifier. On speakerplans there has been a constant 20 year banter going on about which amps are best for subs. Every commercially available amplifier has been tried and discussed.
Cost, weight, reliability are the main factors in the discussion. Any of the suggested amps will do a decent job for you. You have to realize that the field being discussed here is the equivalent of formula1/drag racing. Past what most people would consider satisfying and strong sub and bass. Eye wobbling, dust stirring, concrete cracking at its worst/best. Wolf of blackwood sound for example has six 1852 loaded full scoops on a 20 sqm room, and spanks them all night long on a bunch of chevin amps, until the ceiling cracks or a driver dies. (Many of his patrons prefer to hang outside the venue because its too damn intense  )It all gets a bit silly when you consider that people used to drive one or two double 18" reflex boxes per channel on a CA18 (dub bassline from 8×jbl double18s on 2x CA18 made me dance and skank for the first time, before that i was a headbanger ).Now people bridge the damn things to spank just two drivers  Edited by bob4 - 28 December 2022 at 10:25am |
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levyte357-
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Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Posted: 28 December 2022 at 10:42am |
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Global Depopulation - Alive and Killing.
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Twinkle
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Joined: 08 December 2022 Status: Offline Points: 36 |
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Posted: 28 December 2022 at 9:44pm |
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That's great news.
Thank you very much. I will ask him.
It's difficult to guess for me what will give us the most rounded and musical tone. My friends and me are not about extreme volume. We'll be happy if we find some sweet-sounding speakers and an amp that won't emphasize harshness that's in the music or in the speakers. When you slowly turn up the volume, there's a point when a scoop will change its tone. Not clipping but it sounds like somebody's humming along above the bass. Probably some kind of driver nonlinearity. Does this happen with the PD1852 in a medium chamber scoop before it reaches xmax? Can you run four PD1852s at a sensible volume before it happens? There are some words used on this forum I haven't understood yet. What do people mean with "grunt"? Could you describe it to me? I often hear scoops that sound like a revving engine is playing the bassline. Sometimes the effect is more intense, sometimes it's less. Is that what grunt means? Best wishes Axel Edited by Twinkle - 29 December 2022 at 10:35am |
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KidCreole
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Joined: 06 November 2013 Location: London (East) Status: Offline Points: 3600 |
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Posted: 29 December 2022 at 7:07pm |
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The flatter response (second graph) is the warmer sounding The first graph with the two ''DOGS EARS'' is your more aggressive driver, a driver to clash with that will sound less warm. Edited by KidCreole - 30 December 2022 at 10:52pm |
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Mykey Wattco
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Twinkle
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Posted: 30 December 2022 at 8:49pm |
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Ah, thank you for your explanation. I'm trying to piece together the sounds I hear with what people describe and with anything I read. I'm trying to learn what Thiele/Small parameters do to frequency response now. I did some more reading on this forum. Is "grunt" a peak at low frequencies? Best wishes Axel
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bob4
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Joined: 29 February 2004 Location: Finland/Germany Status: Offline Points: 1843 |
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Posted: 30 December 2022 at 10:20pm |
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Looking at the current offerings of PD Inoticed a new driver in their 18" range
PD.185C003Am I missing something, or does it look better on paper than the 1852? 185c003 has Lower reso (33 vs 41,8) Lower qts (0,24 vs 0,33) Higher BL (31 vs 30) Higher ebp (144 vs 122) Both 5" VC Ferrite vs ceramic VAS is double that of the 1852 though...... Shouldnt this be better suited for horn loading? Its a few quid cheaper than the 1852 too...... .....and still, the big boy B&C drivers would probably outrun it, except price wise  |
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levyte357-
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Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Posted: 31 December 2022 at 11:15am |
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PD.185C003, will need larger chamber to play warm.
1852 designed to play low and warm, in small chamber Scoops. PauliePaul was instrumental in design of the 1851/1852. EDIT:But as in all things, proof is in the pudding..
Edited by levyte357- - 31 December 2022 at 1:13pm |
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Global Depopulation - Alive and Killing.
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turbo7
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Posted: 17 January 2023 at 10:51am |
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The only reason that hornresponse simulations do not seem to correlate with measurements is: People can´t do proper groundplane measurements. The hornresponse simulations are very accurate if you manage to get the dimensions and espansions in your final scoop. Edited by turbo7 - 17 January 2023 at 12:49pm |
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S&P
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Posted: 25 May 2023 at 9:46am |
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It’s been a long time since I’ve posted on speakerplans. Saw this thread and subject title is interesting.
Typical simulation tools that predict speaker response over a wide frequency range will not help with this. This is because warmness is nothing to do with SPL etc. It is to do with the introduction of harmonics, which these tools do not predict. You will need a simulation tool that enables you to predict the frequency response of a speaker with a single tone input signal. Ideally the simulation tool will enable at least 2D simulation, because the simplification that many tools assume of plane wave propagation (1D) does not capture the pressure wave interactions that introduce harmonics. Most of the simulation tools people are using were written years ago, based on acoustic theory. Necessary because of lack of computing power. You’re really looking at using CFD tools nowadays to predict what you want, and with the availability of open source codes, anyone with a decent level of engineering training should be able to get their heads round it. I used to do this stuff in Star-CD when I used to work for the man. Interesting topic though. Sounds & Pressure Audio
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Sounds and Pressure Lo Fi Sound - Ska, Rocksteady, Reggae
http://www.facebook.com/events/412323448834558/432237103509859/?comment_id=432362186830684¬if_t=event_mall_reply#!/groups/75371249167/ |
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bob4 wrote: