Hemp vs. Hammer
Hi Intraman,
I just noticed that you wrote a review of The Hammerdynamics 12
in the year 2000.
Meanwhile you write a lot about the Hemp. Did you switch or do you still use the Hammer as well?
What is the sonic differnce?
I have a large (38 sqm) and very high (2.20m to 4 m) room so I need a lot of driver surface to get decent sound. Minimonitors like reference 3a just die in this room.
I use Yamaha NS 1000 m and Tannoys 385. The Tannoys are just right, the Yamahas have to be used nearly as nearfield monitors.
I also don't like the fashionable slim colums. No body to the instruments and voices!
The Hammers cost me significant morer than the Hemps, esp. as the Hammers must be imported and the Hemps are available here(means Thailand). Anyway we are neighbors!
What is your experience?
I listen mostly to Jazz (traditional, accustic form the 50is and 60is) but also to modern electronix and rap, Madonna and classic rock like Stones, Springsteen, etc. Also all kind of classic.
My single driver experience is only bases on Fostex, they defenitely don't rock!!!
Looking forward to hear from you.
Best wishes
Heiner
i
Hi Intraman,
I just noticed that you wrote a review of The Hammerdynamics 12
in the year 2000.
Meanwhile you write a lot about the Hemp. Did you switch or do you still use the Hammer as well?
What is the sonic differnce?
I have a large (38 sqm) and very high (2.20m to 4 m) room so I need a lot of driver surface to get decent sound. Minimonitors like reference 3a just die in this room.
I use Yamaha NS 1000 m and Tannoys 385. The Tannoys are just right, the Yamahas have to be used nearly as nearfield monitors.
I also don't like the fashionable slim colums. No body to the instruments and voices!
The Hammers cost me significant morer than the Hemps, esp. as the Hammers must be imported and the Hemps are available here(means Thailand). Anyway we are neighbors!
What is your experience?
I listen mostly to Jazz (traditional, accustic form the 50is and 60is) but also to modern electronix and rap, Madonna and classic rock like Stones, Springsteen, etc. Also all kind of classic.
My single driver experience is only bases on Fostex, they defenitely don't rock!!!
Looking forward to hear from you.
Best wishes
Heiner
i
Heiner,
I feel the fr8 is a much better driver than the Hammerdynamics. They also do rock very well... in fact I would say that is their strength. They seem to me to be part of a new breed that borrows much from pro-sound technology... they have excellent dynamic range for an 8" full-ranger. It is difficult to compare the Hammers, they are a modified pro sound driver that require both a notch and a helper tweeter to sound decent. The fr8, on the other hand, is a true full range driver. (lacking only the bottom octave or so) With a few modifications, they sound very good without even a notch filter in the path.
Tim
I feel the fr8 is a much better driver than the Hammerdynamics. They also do rock very well... in fact I would say that is their strength. They seem to me to be part of a new breed that borrows much from pro-sound technology... they have excellent dynamic range for an 8" full-ranger. It is difficult to compare the Hammers, they are a modified pro sound driver that require both a notch and a helper tweeter to sound decent. The fr8, on the other hand, is a true full range driver. (lacking only the bottom octave or so) With a few modifications, they sound very good without even a notch filter in the path.
Tim
Cabinet Suggestion for FR8C?
Hi Gurus,
Can anyone recommend to me a simple to build cabinet for the FR8C? I would appreciate if anyone can share with me on their experience of the cabinet design for the FR8C.
I will probably not venture into Open Baffle design due to space constraint.....
Thanks in advance!
Hi Gurus,
Can anyone recommend to me a simple to build cabinet for the FR8C? I would appreciate if anyone can share with me on their experience of the cabinet design for the FR8C.
I will probably not venture into Open Baffle design due to space constraint.....
Thanks in advance!
Re: Cabinet Suggestion for FR8C?
If you mean you won't be able to put them out into the room away from the walls......you should still try a cheap driver or one you may have lying about in an ob. Experiment, by damping the wall and/or the back of the driver and baffle one can often get good sound even with the baffles fairly close to the wall.
Lin🙂
cjctan said:
If you mean you won't be able to put them out into the room away from the walls......you should still try a cheap driver or one you may have lying about in an ob. Experiment, by damping the wall and/or the back of the driver and baffle one can often get good sound even with the baffles fairly close to the wall.
Lin🙂
Re: Cabinet Suggestion for FR8C?
A bass reflex box is about as simple as it gets (short of OB). The Hemp Acoustics site has detailed plans for two sizes of BR cabinet for the FR8C. I'd expect the larger one to give a flatter response. The FR8C is pretty similar to its predecessor the FR810HQ, which is what I have. I originally had mine in an 82 liter cabinet tuned to 41 Hz.
I later built a pair of Metronome cabinets for mine, and I think they work quite well. Trickier to build than a square box, but the Metronomes are nicer looking and I think they sound better too.
Bill
cjctan said:
A bass reflex box is about as simple as it gets (short of OB). The Hemp Acoustics site has detailed plans for two sizes of BR cabinet for the FR8C. I'd expect the larger one to give a flatter response. The FR8C is pretty similar to its predecessor the FR810HQ, which is what I have. I originally had mine in an 82 liter cabinet tuned to 41 Hz.
I later built a pair of Metronome cabinets for mine, and I think they work quite well. Trickier to build than a square box, but the Metronomes are nicer looking and I think they sound better too.
Bill
Thanks Lin and Tim for your reply.
I am aware of the 2 box design provided by Hemp Acoustic which i will probably choose 1 of them. However, I will like to explore for any other alternatives .
Anyone have any idea whether the mini-onken works well with the FR8C? Just wondering whether the design in the attached file is suitable......
I am aware of the 2 box design provided by Hemp Acoustic which i will probably choose 1 of them. However, I will like to explore for any other alternatives .
Anyone have any idea whether the mini-onken works well with the FR8C? Just wondering whether the design in the attached file is suitable......
Attachments
FYI, Tone Tubby has just released a new 8 inch HempTone sub driver, which looks interesting. Specs to follow...
www.abrown.com
Now, you can build full range hemp flavored systems. I think this thing might be the missing link for lower register augmentation in a hemp tone OB system, and add another in a sealed little sub for low bass. I have been mulling it over this morning, and I think it could work well. Sorry if this is a threadjack. Consider it a public service announcement.
www.abrown.com
Now, you can build full range hemp flavored systems. I think this thing might be the missing link for lower register augmentation in a hemp tone OB system, and add another in a sealed little sub for low bass. I have been mulling it over this morning, and I think it could work well. Sorry if this is a threadjack. Consider it a public service announcement.
Re: Did anyone use the matrix yet?
I have a pair of the new matrix FR8C, just like in your photo.
Don't have old ones to compare to, tho.
They will be going on OB, with powered subs. Hemps to be powered by T-Amps, of course!
salas said:
I have a pair of the new matrix FR8C, just like in your photo.
Don't have old ones to compare to, tho.
They will be going on OB, with powered subs. Hemps to be powered by T-Amps, of course!
So I'm thinking of doing a FR8C project as my entry into a local(Iowa) DIY speaker competition this fall. Any chance a Hemp dipole could compete with the value based Dayton 2-way projects. I know its going to be a different sound. And the DIY will mean the speaker will be required to play at a sound level that're 80bs's at 14 rows back distance in an auditorium.
The Modula M/T was about the same price to construct as a FR8C setup. Would it do well up against that kind of competition?
The Modula M/T was about the same price to construct as a FR8C setup. Would it do well up against that kind of competition?
A Hemp in a bass reflex or mass loaded TL cabinet has a big sensitivity advantage over small 2 ways. So its going to be competitive enough. But if you use it open baffle as you suggested, you must cut the Hemp at 400Hz with at least a 12dB cross and hand over to some bass enclosure. That is for achieving SPL the way you asked for.
hempa fr 8
Hi guys,
again me asking about recent developmaents or enlightments about this driver.
I found a new cabinet on the net, app. 142 cm hugh with the driver in the middle of the height.
I read a lot about the rise in frequency from 1-10khz, is it dramatic??
Is the correction suggested by lousymusician still the best?
Intraman, do you use a correction?
Best regards
Heiner
Hi guys,
again me asking about recent developmaents or enlightments about this driver.
I found a new cabinet on the net, app. 142 cm hugh with the driver in the middle of the height.
I read a lot about the rise in frequency from 1-10khz, is it dramatic??
Is the correction suggested by lousymusician still the best?
Intraman, do you use a correction?
Best regards
Heiner
I like this driver. It works well in the Planet-10 Demetri design. Said to be very nice in the Metronome, too. Can work on open baffle if you add bass support.
It does respond well to the EnABL treatment.
That rise in the midband response does not show in any of my measurements, so I don't understand it. The driver can sound too bright if you don't manage the bass properly - but that is true of most drivers.
It does respond well to the EnABL treatment.
That rise in the midband response does not show in any of my measurements, so I don't understand it. The driver can sound too bright if you don't manage the bass properly - but that is true of most drivers.
Something that I am finding at least as interesting as the FR8 is the new-ish, and obscure Tone Tubby Guitar 8 cone. The more I look at it the more I like the combination of Fs/50, Qts/.7, SPL/93.5, and VERY good right out to 9KHz, with some rising response, but likely pretty durn flat 15' off axis. This one will handle some power without choking, and on a small scale, could wrench abit of "bass" out of, using active DEQ.
I personally wouldnt need any tweeter with this one. Alnico magnet would be nice, but Charlie told me that there just isnt the market in 8's there is in 10/12" cones.
www.tonetubby.com You need Excel to download the specs table.
I personally wouldnt need any tweeter with this one. Alnico magnet would be nice, but Charlie told me that there just isnt the market in 8's there is in 10/12" cones.
www.tonetubby.com You need Excel to download the specs table.
Re: hempa fr 8
Look at the graphs of assorted 8" fullrange drivers. They all exhibit a similar rising response on axis (those with shorting rings display about twice the rise as those without). The fr8 has a very similar response to the fe207.
The rise is good (at least the 5dbish rise of the fr8). Any 8" fullrange will have increasingly limited dispersion as you ascend from 1.5k on up (beaming). The rise offsets that to acheive a decent in-room balance. Most people prefer to listen a little off axis, too. I personally prefer the drivers axis to cross a foot or two in front of me. The imaging is not only great, but it more balanced outside the sweetspot. You can certainly aim them to cross behind you, but other listeners will get a rather unbalanced sound. The narrow dispersion sounds like a pain, and it kind of is. However, it means that the room affects the high frequencies much less, which is also a good thing, IMHO.
I haven't seen the cabinet you mention, but I'd stick with something either well tested or at least designed with Martin's software. I, of course, like the BIB, but it won't work for all. The demetri would be great. If it is too big, look at the Metronome or one of the MLTL's GM or ScottMoose have posted. They'll all give predictable results.
pj
heinermoessing said:
Look at the graphs of assorted 8" fullrange drivers. They all exhibit a similar rising response on axis (those with shorting rings display about twice the rise as those without). The fr8 has a very similar response to the fe207.
The rise is good (at least the 5dbish rise of the fr8). Any 8" fullrange will have increasingly limited dispersion as you ascend from 1.5k on up (beaming). The rise offsets that to acheive a decent in-room balance. Most people prefer to listen a little off axis, too. I personally prefer the drivers axis to cross a foot or two in front of me. The imaging is not only great, but it more balanced outside the sweetspot. You can certainly aim them to cross behind you, but other listeners will get a rather unbalanced sound. The narrow dispersion sounds like a pain, and it kind of is. However, it means that the room affects the high frequencies much less, which is also a good thing, IMHO.
I haven't seen the cabinet you mention, but I'd stick with something either well tested or at least designed with Martin's software. I, of course, like the BIB, but it won't work for all. The demetri would be great. If it is too big, look at the Metronome or one of the MLTL's GM or ScottMoose have posted. They'll all give predictable results.
pj
To avoid confusion, if you build anything but the BIB, you'll probably need to add BSC (a circuit). You might avoid it with something wide, like the demitri, right against a wall. But, this isn't specific to any driver. You'll need BSC with any speaker you build. Some are happy to go without, but you'll get a "lean" response. If you're confused, you can search for BSC (baffle step compensation or correction) here, or via google.
pj
pj
planetx... 🙂....
can you send me the sketchup file for the HempFR8/Fostex 167/207 Demetri enclosures? Seems like I'll be building a set tomorrow and it would save me a fair bit of time, redrawing the plans and calculating the finished dims for the parts🙂
or if you have a cut list😉
can you send me the sketchup file for the HempFR8/Fostex 167/207 Demetri enclosures? Seems like I'll be building a set tomorrow and it would save me a fair bit of time, redrawing the plans and calculating the finished dims for the parts🙂
or if you have a cut list😉
Re: planetx... 🙂....
Can you open a vectorworks or DXF or DWG... that would be more useful for planning parts... i'll dig out the SketchUp and make sure it is posted in the warehouse (and mail it to you)
If you do a cut-pist plan, mail it to me, i'll add it to the plans.
dave
Nanook said:
Can you open a vectorworks or DXF or DWG... that would be more useful for planning parts... i'll dig out the SketchUp and make sure it is posted in the warehouse (and mail it to you)
If you do a cut-pist plan, mail it to me, i'll add it to the plans.
dave
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