The DSP itself may be cheaper than a good DAC you would need to go with it.
Good DACs are cheap too. But when DSP, DAC and monster amp are in in one box you can charge a premium. esp with the proprietary software.
Looking online looks like the amp combos are around 7k of the 20k price, so nice little extra. And 7k for 4x2.5kw... That can't sound good that cheap
EDIT: looking at UK prices, a pair of speakers is £8840 and the amps £7600. Of course not clear if they will sell you just the speakers, but £15k, whilst a lot is low for the a big active system.
Looking online looks like the amp combos are around 7k of the 20k price, so nice little extra. And 7k for 4x2.5kw... That can't sound good that cheap
EDIT: looking at UK prices, a pair of speakers is £8840 and the amps £7600. Of course not clear if they will sell you just the speakers, but £15k, whilst a lot is low for the a big active system.
Last edited:
You are welcome.
Fifteen EQ. Filters most probably can (>edit: could) do this.
A 2x4MiniDSP HD with it’s 20 EQ. Filter bank per channel can do it.
This is what is achievable using the old 2x4MiniDSP with it’s limited 12 EQ. Filter bank per channel.
Three more EQ. Filters are needed for to emulate the original DSP electrical output of the High Channel.
(I’ve implemented these three filters individually and they match the original electric output curve fine).
There is also a 10% frequency misplacement of the original data set in these attached graphs.
George
Attachments
Did I see 20 dB of HF boost in the DSP curve for the JBL? That can play havoc with the dynamic range of the DSP and associated amp. Not to mention the voice coil of the tweeter. And the horn has an acoustic peak at 3 KHz, something that really pushes the perceived "clarity" a lot. Its eq'ed in the frequency domain but I would like to see a waterfall plot and off axis to see if its uniform and doesn't have any "hangover".
Good DACs are cheap too. But when DSP, DAC and monster amp are in in one box you can charge a premium. esp with the proprietary software.
Looking online looks like the amp combos are around 7k of the 20k price, so nice little extra. And 7k for 4x2.5kw... That can't sound good that cheap
EDIT: looking at UK prices, a pair of speakers is £8840 and the amps £7600. Of course not clear if they will sell you just the speakers, but £15k, whilst a lot is low for the a big active system.
For a chip cost less than a modest dinner you can get a TI or ST DSP+amp at 250W. With discrete devices probably breakfast and dinner out to get much higher power. TI has a smart amp technology that predicts the voice coil temperature and actively limits the drive as the voice coil gets hotter. I think there are others doing it as well in the high volume audio amp biz.
This high end stuff seems so ancient by comparison.
This is not so different from what people are doing with other kinds of electric motors. It can get pretty sophisticated, sometimes only using voltage and current sensing to infer quite a bit about the state of a system.
You can. I was pointing out a clever marketing model from JBL not the fact that the DIY'er can knock up something with 10th of the power for a few quid. Or like Richard something 10th of the power and (if he paid retail) several times the cost.
The 2x4HD in addition also has about 2k taps per channel of FIR eq available, for still more filter shaping; or for near-arbitray phase response correction. A rather amazing little gizmo, actually.
I have the miniDSP HD for this and the new amps are still being built a.t.t.
But, it sounds really great as it is.... I think it is a combination of things.... but flat response isnt one of them. The speakers I have used in the past had flat response also. The QUAD ESL 989 are very flat and low distortion also. It then is the dynamic range without compression. The ESL are very compressed sounding. Until now, I thought it was the CD's. Combined with very low distortion and it's directionality, flat power response, gives a very good and detailed sound. Imaging is superb, as well. Oh, and no sub-woofer will be needed. Can't wait for the miniDSP and uber amps are in place. Once again, the JBL-Pro M2 Master Reference Monitor for mastering really, really shows the importance of the speaker in the whole process.
Got to go put on some RR recordings and Sheffield Lab Drum Record (CD) and music from various Test Discs.
THx-RNMarsh
Last edited:
Yeah, there's something to be said for looking at reducing HOM's and other forms of distortion, directivity and spectral decay/ringing, all of which aren't going to be as easy to control as phase/magnitude.
Richard, I auditioned your speakers just once, and brifely, a late friend purchased them. I was properly stunned with them, I have never before heard such sound from a passive speaker with no electronic crossovers followed by biamping of some quality.
I understand your curiosity about them, but for the time being, why don't you just relax and listen to them before ruching into tweaking.
Please, you're asking the most ridiculous thing. No, that's a question as if I couldn't even tell you what direction electrons flow.
Horns prevent the muddling of the music from interaction with the room. Non-horn speakers do not. So if the electronics don't put out a high quality distinct signal because they're low noise, then without horns you have muddled music getting muddled more.
It's not overly complicated. But I've found with a lot of treatment for noise within and before the electronics gives such more district sound that room-treatment and type of speakers becomes less of concern. It's still beneficial, but perhaps not necessary as some would say. Obviously speaker enclosure plays a big factor, since ones that vibrate a lot are just as bad for the music's definition.
- Status
- Not open for further replies.