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Multi-Way Conventional loudspeakers with crossovers

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Old 4th April 2007, 04:16 PM   #71
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Default More Hemp

I do not work for Hemp Acoustics. I have no affiliation with them at all. I can say that they have been extremely responsive to my inquiries about their product via phone and email. Regardless of what product/pricing is available on distributors websites, I have been able to get pricing and product information directly from Hemp Acoustics when I asked for it. This does not mean that I can buy direct from them, just that they were willing to provide ballpark retail figures. As far as I know the new drivers are available, so if you are so inclined, order them.

It is always a surprise to me when OEM manufacturers take time out of their day to address inquiries from the DIY community. In my opinion, we are not their market. I would be surprised if the total $'s we diy'ers comprise totals more than 1-2% of an OEM driver manufacturers' annual revenue.

My comments earlier about published specs finally being available on their site was simply to share with the group that they are there. I had been waiting for their site to be updated and thought others might be too.

Best,
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Old 4th April 2007, 05:17 PM   #72
jzagaja is offline jzagaja  Poland
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Because I'm experimenting with binaural recordings it is good to cite here the story about Blumelin:

"Many of us have, however, heard recordings of stereo systems that do sometimes produce images that come from beyond the speakers and some audiophiles believe that if they could only get perfect recordings, speakers, cables and electronics, the image would open out. Blumlein was also loath to admit defeat on this point. He writes "but if it is desired to convey the impression that the sound source has moved to a position beyond the space between the loudspeakers the modifying networks may be arranged to reverse the phase of that loudspeaker remote from which the source is desired to appear, and this will suffice to convey the desired impression for the low frequency sound." (hang on to that word "low".) This suggestion makes sense in a particular movie scene where you could briefly reverse the phase of one speaker to move dialog or a sound effect off screen, but we know that leaving one speaker out-of-phase all the time does not work for music reproduction via the stereo triangle. What Blumlein was suggesting is a primitive form of logic steering thus foreshadowing Dolby Pro-Logic. But he has explained why sometimes images do appear beyond the position of the loudspeakers. Any inadvertent phase reversal of a spot microphone in recording or an out-of-phase driver, or a large phase shift in the crossover network of a three or four way loudspeaker system or a reflection from the wall behind a dipole loudspeaker can convince even experienced listeners that wider stages can be achieved, somehow, using normal stereo technology. Unfortunately, logic steering, surround coding and even multi-channel recording methods cannot achieve the binaural ideal that Blumlein was striving for."

Source:
http://www.ambiophonics.org/blumlein_conspiracy.htm
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Old 4th April 2007, 05:39 PM   #73
peufeu is offline peufeu  France
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Quote:
One of the nicest things about being an old fart is I no longer feel a need to defend my tastes in music and hifi. During the time I was doing reviews for Positive Feedback magazine, I discovered my tastes align with only about 2 to 5% of audiophiles, and I was most certainly out of sync with all the mainstream magazine reviews.
Well, I'm 30 and I don't really like modern hi-fi either... Last time I went in the shop to listen to stuff I was like "ergh. bleh !". Then I heard the kits. There was a nice lushy AMT tweeter paired with a 12" woofer. I told the guy the crossover was too high and the breakup modes made me want to cry blood from the ears. He told me that yeah, but people like the sound. Ha ! I don't.

Anyway, I experimented with dipoles myself and liked what I heard...

It was just a quick experiment, so I used a PC with digital crossover, a 8 way gainclone (since then it burnt) and the drivers I had lying around for other past projects that didn't work out :

- 15" pro sound from TVM acoustics (eastern europe) in H dipole baffles
- 14cm SEAS CB17/RCYP midranges
- Unnamed chinese ribbon tweeters

The really nice thing about digital crossover is that you can measure stuff and input your crossover curves in the computer at will, so it really is "rapid prototyping".
In about 2 hours I got something that was not perfect, but it was promising and had the characteristics of dipole sound :

- amazing clarity and punch in the bass (no room modes !), although a bit dry
- no box sound in the midrange, very lively and enjoyable
- really good dynamics (active system with digital crossover...)

So the experment was a success. However :

- Size of the midrange driver is a problem ; the H baffle for woofers has a large resonance peak above the usable bandwidth so you must use a rather steep lowpass. This means the midrange driver must also double as a midbass driver ; for a dipole this means you need surface and displacement, or a very large panel. These 14 cm drivers were too small, so they were never able to really meet the woofers, and male singers voices sucked. I also tried them in sealed enclosures, well, I prefer dipoles.
- It looked too messy with all the wires so it had to go out of my living room

For the midrange panel I used plywood ; this vibrates nicely as the panel edges flap like wings. Then I tried a sandwich of roof tar between two sheets of 10mm MDF : very dead, no resonances.

I'll try to rebuild these someday, but first I have other stuff (http://audio.peufeu.com).

Anyway, please consider active crossover for the woofer. It's worth it, especially for a dipole.
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Old 4th April 2007, 07:11 PM   #74
agent.5 is offline agent.5  United States
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Default Re: More Hemp

Quote:
Originally posted by chrismercurio
[B]I do not work for Hemp Acoustics. I have no affiliation with them at all.

Neither do I. Looking at the graphs, the FR6.5C looks pretty good, especially at >10K Hz, comparing to the 8" model.

I think a FR6.5C with one or two 15" pro drivers for the bass may work.
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Old 4th April 2007, 07:55 PM   #75
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Default Re: More Hemp

Quote:
Originally posted by chrismercurio
As far as I know the new drivers are available, so if you are so inclined, order them.
I went to order some 4.5s yesterday -- they won't be in till later in the month. This one is interesting as it looks to be a drop-in replacement for the FE127e which has lots of existing enclosure designs (and to stay on topic) would work fine in an OB with a helper woof (might not have the dynamic capability of some of the larger drivers, but i bet, better mids and no need for a tweeter.

dave
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Old 4th April 2007, 08:44 PM   #76
agent.5 is offline agent.5  United States
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Default Re: Re: More Hemp

Quote:
Originally posted by planet10
[B]

I went to order some 4.5s yesterday -- they won't be in till later in the month. T

How much?
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Old 4th April 2007, 09:16 PM   #77
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Default Re: Re: Re: More Hemp

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Originally posted by agent.5
How much?

Mail me.

dave
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Old 4th April 2007, 10:29 PM   #78
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Lynn and others,

The Tone Tubby alnico drivers were mentioned. They look like great drivers and I have heard wonderful things about alnico drivers, but my understanding is that anlico drivers will distort at lower spls than ceramic. I may have read the information wrong. I believe Lynn mentioned liking the higher spl capabilities of pro drivers. Would the TT alnico drivers be able to reach spls close to where Hemp Acoustic's new coaxial drivers can reach?

Recently I have been listening to my system at higher spls, or trying to atleast. And the drivers distort easily with so little power. So I am now leaning more towards pro driver for my next project.

Thanks,

Josh
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Old 5th April 2007, 01:19 AM   #79
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Quote:
Originally posted by Lynn Olson
In terms of gizmos I'm researching in the immediate future, I'm going to be mentioning this and that bone-regrowth devices to my surgeon on May 1st. These aren't made by New Age electronic-gizmo companies - they also make this and that charming implements that are in my leg right now. So my attention isn't 100% on hifi right now.
Hi Lynn,

I sort of recognise the plate and the screws, as I got something of that sort to hold my humerus together while it was healing back in 1993. And, no, it was not humerous ! 4 months in plaster from fingers to shoulder and then learning how to do everything except wiggle my fingers all over again.

I figure the CIA hire their torturers from the ranks of the rehabilitation therapists. I'm sure they love the screams as you learn how to use your muscles all over again. Not dissing the job that they do though - I have had full movement in my arm since about 8 months after the accident.

I don't envy you for this next period. But it will give you a chance to reflect and write, so some good may come of it... Just remember the phrase: "Please {sir/madam}, may I have another..."
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Old 5th April 2007, 09:36 AM   #80
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Quote:
Originally posted by Cloth Ears


Hi Lynn,

I sort of recognise the plate and the screws, as I got something of that sort to hold my humerus together while it was healing back in 1993. And, no, it was not humerous ! 4 months in plaster from fingers to shoulder and then learning how to do everything except wiggle my fingers all over again.

I figure the CIA hire their torturers from the ranks of the rehabilitation therapists. I'm sure they love the screams as you learn how to use your muscles all over again. Not dissing the job that they do though - I have had full movement in my arm since about 8 months after the accident.

I don't envy you for this next period. But it will give you a chance to reflect and write, so some good may come of it... Just remember the phrase: "Please {sir/madam}, may I have another..."
The original experience of crawling up a frozen driveway with a leg broken in several places (both tibia and fibula were broken, and the tibia was in several pieces) recalibrated my experience of pain permanently. I've had kidney stones once before, but this was beyond all description - I was cycling in and out of shock every few minutes until the EMTs got me hooked to an IV line in the ambulance. I didn't even feel the IV line going in, nor did I feel it for the next three days at the hospital.

I'm quite sure that if the EMTs hadn't got there in the first few minutes, I could easily have died of shock and exposure on that sub-freezing day. If I was living alone on some country road, didn't have Karna looking out the window, seeing the whole thing, and calling 911, it could have turned out differently.

By comparison, the post-surgical pain was quite modest, and by the 3rd day, I discontinued taking the oral painkillers (a version of OxyContin as it turned out).

I've already gone through 4 weeks of physical therapy - it's demanding and reaches my physical limits, but my power of will has grown along with greatly improved balance and strength. I've also been gently stretching the leg, massaging the muscle to improve blood flow (fun tingling sensation), and doing the range-of-motion exercises recommended by the therapists.

Day-to-day life has me exercising at a demanding level, working up a sweat for even simple activities. Something as simple as going up and down stairs is a whole different experience doing it on your backside using both arms and one leg to hoist yourself up, while managing a collapsed walker at the same time. Although it's nicer to sleep with the velcro-attached boot off, it goes on any time I need to move, and that's 5 straps in all, some a rather long reach on the far side of the leg. All activities require careful planning on the best method to accomplish the goal - it certainly makes you physically focussed, that's for sure.

The intensity of this experience, and the different quality of day-to-day life, has led to a personality change - everything looks and feels a little different now. I'm sure as my recovery continues, the personality changes will also continue.

Dream life has become much more vivid, although that might partly be due to elevated doses of B-complex and calcium I'm taking now. It's a real shock to go from a colorful 3D flying dream on Parallel Earth to this reality, with the muscular push-up from the bed to the clunk-thud of the walker to get from one side of the room to the other.

The first week after the return from the hospital was especially weird, since my sense of taste was grossly altered - there were entire flavors that simply disappeared. I later found out that it takes about a week or so to completely sweep the anesthetics out of the body, and the full sense of taste gradually returned. For the first two or three weeks, there were big day-to-day mood swings - which you can see in the Clarisonus blog posting - but now things have smoothed out a bit.

I'm more mobile now, and can get around a bit more easily as I master the walker, crutches, driving the car, and using the wheelchair. Even driving the car feels different, I can't describe it, but I'm much more aware of everything around me, and everything looks and feels sharper and crisper.
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