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what do you think of my Prototype ?

May 9, 2005
190
24
This Cab goes down to 65 Hz pretty much straight, then its starts to roll of. -3 dB point is around 60 Hz

That means it is also working with a 6 string.
well i have one, and it surely works =)
now if you thinks you need a box doing 32 Hz you re qute wrong actually you dont want to have 32 hz =) unless you have a 3Kwatt Amp and a couple of 18 Drivers handy and want to make some sensuround in da house. its going to be a earth quake.
the actual tone wich we hear as a pitch from a low B ia great part of it is around 120 Hz. 64 makes it fatter, 32 Hz makes a very low biiig Rumble.

Usually the dBs in the specs are measured at 1 Khz.
In my case this speaker has 103 dB with one watt

No Tweeter is needet unless you really want a super bright tweeter sound.
I think it sounds bright enough in flat position, I usually even lower it a litle.

The most positive point about a one-way speaker is, there is no Crossover network involved, a crossover networks allways diminishes punch dynamics and if you ask me also the sound.
I have not heard one passive crossover network wich doesent lessens the original signal or has phaseshifting of some sort.
many crossovers i heard sound dull.
Sometimes the negative sides of a Crossover are covered very well, but if you have experience you still can hear it.

The cabs I made here dont seem to be loud, I think its because of the clear sound with no distortion produced by the Chassis.
this makes you think its not loud, but you can feel the sound pressure in yout ears. and the best part is you dont really need to screw open the Volume you can hear it very well in a loud Band.
its also very percussive you have a nice strong low frequency attack wich really pushes air.

This stack of 2*12s can deliver 126 db before reaching Xmax.
and also because the driver couples it will throw the sound farther than just one Cab.
Xmax means there is absolutely no audible distortion up to 126 dB.
im not sure if you call that distortion in english. sometimes its referred to as K2 K3.
You can go quite a bit over that before you hear any distortion.
Im pretty its probabbly over 130 dB.

Drivers with that kind of parameters are quite expensive because of the large magnet needet. its sad zthat many comanys save on that point and often put drivers wich seem to be loud but actualy its distortion because the magnet is to small.there is also other tricks like bumps around a certain area in the ferquency spectrum.

I made the resonse of the cab as flat as possible and I took the bigges Magnet lenght i could find and is stull affordable because I dont like bumps i can add bumps if i need it =)

Well lots of technical talk, i know, but these are real important points in order to get a clear sound out of a Cab.

Of course you also need also a good Amp wich can deliver the Ampere for those 130 dB other wise it will distort, but not from the Speaker =)

1 cab can take 300 Watts Rms 600 watts peak

2 cabs can take 600 watts Rms 1200 watts peak

3 cabs ...... well i think you re deaf or had enough any way by then =)


In a simple Example:
2 of these 12" cabs are almost as loud as a 4-10 Eden I tryed that side by side. I dint measure it but im Guessing its about 1to max 2 dB difference.

that means:

2*12 = 1000cm2 membrane suface
4*10 = 1400cm2 membrane suface

4*10s have 30-40 % more membrane surface depends on the model.

My Cab soundet a lot warmer, fuller and clearer, and thats not only to my ears. the owner of the Eden was quite surprised.

The Eden was more agressive in the mids, wich tells me that it isnt a flat response cab. In general the Eden has a rougher sound.
I have to say that doesent has to be a bad thing. its a question of taste.my Cabs character is closer to a recent Markbass Cab, but quite fatter and a lot warmer and not harsh like those.
well I have to say I was very sceptical how that is going to sound and i was very much surprised on the result.
Looks lke its true that some times also a blind chickn finds a corn.
I guess i have to go to stores and ask more bassists to try it and see what they say =)


The amp I use is a Demeter HB 600 flat response amp very clear sound, with a good EQ wich allows to shape the sound very well if you need to adjust to a room. I dont use the EQ normally with this Cab. maybe some low cut becaus it really goes almost to Low,
but rather cut than boost ; )
I could try a Eden WT1000 with a very old Demeter Pre and see how that does but I guess thats not that much of a difference.

I make Speakers for over 20 years, now I made this mostly because I could not find something I really liked.
My next project is a 4 -10. and a Tube OTL power amp.

And of course I play Bass =)

Cheers Lemon

oups forgot the Dimensions...

its 54cm wide like a rack 38 cm deep and 46 cm high
 

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Aside from a bit of rambling and mis-spellings it was an interesting post, although it seems you went on quite a bit about a simple head and speakers. I have a system not far removed from a large PA system (without the highs) which sounds incredible (at least to me), to explain it is sort of simple-(Upper bass/mids) ADA pre driving a behringer eq driving a Crest FA-1201 driving an upright 4x12 with Eminence Swamp Thangs,the lows are also fed from the ADA pre and feed straight to a Carvin R600 bridged in mono that feeds a large Mesa single 18 cab with an Eminence Omega pro(8 ohms) and also feeds a small 20"x20" single 15 cab with an Eminence Magnum (also 8 ohms)... by the way,I've always thought xmax was the shorter version of the term "maximum excursion", I've always thought that going beyond xmax would cause the speaker former to hit the back plate of the magnet assembly which I guess you can say is a form of distortion however if you drive a speaker with constant mid frequencies(for example) far above its RMS power rating you'll typically hear traditional distortion before the voice coil burns out but you're probably right and I'm probably wrong.
 
Thursday said:
Can someone explain what does dB, Hz, Rms, means?
dB = deciBells. A system of measurement. The Bell is named for Alexander Graham Bell and was first used by the phone company when they needed a way to measure signals when running lines across the US. The decibell is one tenth of a Bell. (We don't really use Bells in audio.) They are a ratio of something to something else and don't really mean anything without a reference like dBVU or something. In these specs, we can assume that it's deciBells of Sound Pressure Level - dB SPL.

Hz = Hertz, where you rent cars. :smug: Hertz means cycles per second.

RMS = Root Means Square. It's a way of standardizing amplifier output ratings. It's sort of an average. I forget just exactly how it's figured.
 
Thursday said:
Ok, so all of that is used to measure an amp\cab? Can you just say I like the way it sounds?

You might still want to know the other statistics. If your poweramp puts out 1,000 watts and your cab can only handle 200 watts RMS (or vice versa), you want to know about it.

The F3 point (-3dB@60Hz) is useful as it gives you a clue as to how deep the cab is. The sensitivity (95dB@1W/1M) will give a clue as to how efficient the cab is. Both of these statistics may be fudged a great deal, so you still want to hear the cab. But if the manufacturer isn't lying, such as in the case of Acme, you can tell that: A Low B-2 has an F3 of 41Hz (PERFECT if you play a 4 string, VERY respectable if you play with a low B) and a sensitivity of 93dB (not very loud; will require a lot of power/speakers to be heard).
 
Mighty Saturn 5 said:
Aside from a bit of rambling and mis-spellings it was an interesting post, although it seems you went on quite a bit about a simple head and speakers. I have a system not far removed from a large PA system (without the highs) which sounds incredible (at least to me), to explain it is sort of simple-(Upper bass/mids) ADA pre driving a behringer eq driving a Crest FA-1201 driving an upright 4x12 with Eminence Swamp Thangs,the lows are also fed from the ADA pre and feed straight to a Carvin R600 bridged in mono that feeds a large Mesa single 18 cab with an Eminence Omega pro(8 ohms) and also feeds a small 20"x20" single 15 cab with an Eminence Magnum (also 8 ohms)... by the way,I've always thought xmax was the shorter version of the term "maximum excursion", I've always thought that going beyond xmax would cause the speaker former to hit the back plate of the magnet assembly which I guess you can say is a form of distortion however if you drive a speaker with constant mid frequencies(for example) far above its RMS power rating you'll typically hear traditional distortion before the voice coil burns out but you're probably right and I'm probably wrong.


sorry about the miss spelling but english isnt my first language.

The Xmax is when the end of the voicecoil leaves the center of magnet field thats where the disortion starts, but that distortion isnt audible if you go over it a bit especially in low frequencys like a Bass puts out you really dont hear it. but it increases very quickly after that point, in a way it increases exponentially. because as farther as the coil is away from the strongest point of the magnet as less the coil is controlled by the magnet
and as you all know if you take 2 magents and try to squeeze it thogether
positive side faced as closer as you get to touchdown as more you have to push it thogether.

What you mean is Xd = Xdamage, that means the driver is taking a leap out of the chassis, or the voice-coil former wich the voice coil is windet on, is bent or cracked, Then it fries, because it touched the Pol and the magnet.

If the coil would hit the Polplate on Xmax, you would get a loud bang not K2 and K3 distortion wich actually called Harmonic distortion.
Most likely you kill the driver with this kind of force.
Usually its a to weak amp wich causes the coil to uncontrolled move inside the airgap, at some point it burns the coil because it touched the Magnet in
many cases of damaged drivers that happens

I dont know Xd on this one but on a good driver I thinks its usually about double the Xmax.

Yes the setup is simple but pretty strong for the size and mostly important it has no Harmonic distortion at high volumes bexause Xmax is big.
As a monitor its perfect and super clear.
the rest can be taken out of the DI fed in to the PA.
I think its clear that this is not meant to fill a 30000 seat auditorium with 130 DB sound pressure and no PA support, most likely you wont need that unless your name is for example Tony Levin.

If i need something like that I can make X*15, X*12" and X*10" with X of those new Crown iTech Digital 4kWatt amps, the DSP programmed with some fitting Crossoves. =)

About no Tweeter,
I meant that I not have seen many high power bass drivers with such good response all the way up to 5k.

Im sure your rig sounds good
what I meant is passive crossovers, yours looks like its active filtered on wich you have also a straight to the Cab connection from the amp, and you dont go first through 30 foot wire on a spool wich in the worst case is made of ferrite. and if that would not be enough the signal has to also squeeze itself through the windings of capacitors to loose some edge on the way.

what I have made here is good for Club size and if I need more power I hook a Crown Poweramp, with DSP to the Preout and stack for example 1 more 12* cab wich makes 3 cabs running at 2 ohms and a couple of 15"
hooked up with the Crown.

the whole post was intendet to clear some miss conceptions and understandings about Cabs. and I admit also to show of one of my best sounding creations so far, but also to find out what other bassistst think of it.

I made a Fullrange speaker for a Rhodes with short Xmax and i can tell you that thing has Harmonic distortion way before you reach the max Wattage
it hurts the ears.

Cheers Lemon.
 
This Cab goes down to 65 Hz pretty much straight, then its starts to roll of. -3 dB point is around 60 Hz

That means it is also working with a 6 string.
well i have one, and it surely works =)
now if you thinks you need a box doing 32 Hz you re qute wrong actually you dont want to have 32 hz =) unless you have a 3Kwatt Amp and a couple of 18 Drivers handy and want to make some sensuround in da house. its going to be a earth quake.
the actual tone wich we hear as a pitch from a low B ia great part of it is around 120 Hz. 64 makes it fatter, 32 Hz makes a very low biiig Rumble.

Usually the dBs in the specs are measured at 1 Khz.
In my case this speaker has 103 dB with one watt

No Tweeter is needet unless you really want a super bright tweeter sound.
I think it sounds bright enough in flat position, I usually even lower it a litle.

The most positive point about a one-way speaker is, there is no Crossover network involved, a crossover networks allways diminishes punch dynamics and if you ask me also the sound.
I have not heard one passive crossover network wich doesent lessens the original signal or has phaseshifting of some sort.
many crossovers i heard sound dull.
Sometimes the negative sides of a Crossover are covered very well, but if you have experience you still can hear it.

The cabs I made here dont seem to be loud, I think its because of the clear sound with no distortion produced by the Chassis.
this makes you think its not loud, but you can feel the sound pressure in yout ears. and the best part is you dont really need to screw open the Volume you can hear it very well in a loud Band.
its also very percussive you have a nice strong low frequency attack wich really pushes air.

This stack of 2*12s can deliver 126 db before reaching Xmax.
and also because the driver couples it will throw the sound farther than just one Cab.
Xmax means there is absolutely no audible distortion up to 126 dB.
im not sure if you call that distortion in english. sometimes its referred to as K2 K3.
You can go quite a bit over that before you hear any distortion.
Im pretty its probabbly over 130 dB.

Drivers with that kind of parameters are quite expensive because of the large magnet needet. its sad zthat many comanys save on that point and often put drivers wich seem to be loud but actualy its distortion because the magnet is to small.there is also other tricks like bumps around a certain area in the ferquency spectrum.

I made the resonse of the cab as flat as possible and I took the bigges Magnet lenght i could find and is stull affordable because I dont like bumps i can add bumps if i need it =)

Well lots of technical talk, i know, but these are real important points in order to get a clear sound out of a Cab.

Of course you also need also a good Amp wich can deliver the Ampere for those 130 dB other wise it will distort, but not from the Speaker =)

1 cab can take 300 Watts Rms 600 watts peak

2 cabs can take 600 watts Rms 1200 watts peak

3 cabs ...... well i think you re deaf or had enough any way by then =)


In a simple Example:
2 of these 12" cabs are almost as loud as a 4-10 Eden I tryed that side by side. I dint measure it but im Guessing its about 1to max 2 dB difference.

that means:

2*12 = 1000cm2 membrane suface
4*10 = 1400cm2 membrane suface

4*10s have 30-40 % more membrane surface depends on the model.

My Cab soundet a lot warmer, fuller and clearer, and thats not only to my ears. the owner of the Eden was quite surprised.

The Eden was more agressive in the mids, wich tells me that it isnt a flat response cab. In general the Eden has a rougher sound.
I have to say that doesent has to be a bad thing. its a question of taste.my Cabs character is closer to a recent Markbass Cab, but quite fatter and a lot warmer and not harsh like those.
well I have to say I was very sceptical how that is going to sound and i was very much surprised on the result.
Looks lke its true that some times also a blind chickn finds a corn.
I guess i have to go to stores and ask more bassists to try it and see what they say =)


The amp I use is a Demeter HB 600 flat response amp very clear sound, with a good EQ wich allows to shape the sound very well if you need to adjust to a room. I dont use the EQ normally with this Cab. maybe some low cut becaus it really goes almost to Low,
but rather cut than boost ; )
I could try a Eden WT1000 with a very old Demeter Pre and see how that does but I guess thats not that much of a difference.

I make Speakers for over 20 years, now I made this mostly because I could not find something I really liked.
My next project is a 4 -10. and a Tube OTL power amp.

And of course I play Bass =)

Cheers Lemon

oups forgot the Dimensions...

its 54cm wide like a rack 38 cm deep and 46 cm high

soon I will do some measurements with professional Neutrik Measurement gear.
This software showed so far pretty close what the neutrik A2 measured.
 

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mgood said:
Absolutely. Specs are great. They can tell you a lot. But the final measurement, and really the only measurement that matters, is how it sounds to YOU.
thats true too i

It has a HIFi like sound because the response is very flat.
from there you can cut or boost with the EQ, the way you like


I can only say it sounds very clear like if you plug you bass through a Preamp in a studio console and listen through the speakers.
that is only the case if every thing is set flat on the Bass and the Amp.

if you play fingerstyle you can have that very strong and fat popping sound before the tone similar as if you hit the string with the thumb ( slap & pop style ) with out the fret clonk soundin other words articulation is coming through very easy.

It depends also on the bass im sure (mostly pickups) and amp too. I mean if you play a chinese 150 dollar bass with crappy pickups and a $100 bass amp from a mail order store, wich has underware as the main business.......

well maybe it even sounds good with that =) I didnt try
I could try my first amp a 50 watts KMD and see how it sounds like.

I think it just puts out, what goes in in because the response is flat and neutral. If you go to the High end HIFI shop and listen to some speakers, known to have a flat response you will know what im talking about. Its basically the same just bigger and louder. Flat response speakers sound very similar. There is of course differences on the sound due to the diaphragm materiai used. Polypropylene has a different sound than Paper more dull and dead less dynamic Glassfibre sounds different from Carbonfibre, carbon is simmilar to polypropylene just less dead.

The chassis I used i has a Paper diaphragm. In my oppinion, the best material to get a alive and real sound.

Lemon