I've got a pair of pa speakers which have [4] 3 inch diameter holes in the baffle.Two either side of the bass driver at the bottom,two either side of the bass driver at the middle.
The baffle is made of plywood,and is 1 inch thick,so is the rest of the speaker cabinet made of 1 inch thick plywood.
The cabinets are trapazoidal shape measuring 630 mm height x 480mm wide x 380mm deep.
The drivers are 1x Eminence Beta 15 rated 350w rms [15 inch],
15 inch x 5 inch horn made my CTS, and CTS KSN1142 powerline piezo horn driver rated 400w.
I don't see why the manufactor has used a Eminence beta 15 with a sensitivity of 98 db,and a CTS piezo of 92 db,because the
bass driver is 6 db louder.Because of that problem,i had to go out and buy a graphic equaliser to boost the lack of treble.
I'm thinking of replacing the piezo with either an Eminence PSD2002 or APT50 comp driver plus Eminence crossover,would either of these fit on a plastic horn with a plastic 3/4 inch thread.
Also the one of the cabinets is missing a crossbrace,how easy is it to fit one,since i didn't make the cabinets.Also there is no wadding on the back panel,nor is there any ports,just 4 holes cut in the baffle.
The only thing i like about the speakers is the bass,the midrange and treble if not heavily boosted with the graphic equaliser is muffled and in the background,but if you reduce the bass[kill or cut it] it becomes weak.
i paid £300 pair new for these speakers,and i'm outraged that the manufactor,could be so stupid and forget to add a wooden crossbrace to one of the cabinets,and the moody people at the shop where i bought them,don't want anything to do with it.Are speakers supposed to come with a guarntee when new.
I know the drivers would never be covered,but manufactoring defects should be covered.I'm sick of that shop,because every thing i buy there breaks down within a few years,and the staff are very moody,crude and have very negative attutudes to make you buy something you don't really want to buy.By telling lies,saying that the speakers,have a compression driver and crossover,when it's actually a piezo and no crossover.All the mistakes are hidden inside the cabinet,i only opened the cabinet because it sounded rather dull and one baffle buzzed in a time to the bass[cos of missing centre crossbrace].
Could someone help me the best they can,I think i might as well just sell them,but i don't want to to get peanuts for them.
I paid £300, i want £100 min for them only 4 months old.Not crappy peanuts amount like £20,thats what most awful shops give ,one tenth of the price you paid.If anyone knows Cash Convertors i realy hate that shop,and they charge new prices for second hand stuff.And what puzzles me is ,how many morons buy stuff from there,when they can get the same product not much more,brand new.
The baffle is made of plywood,and is 1 inch thick,so is the rest of the speaker cabinet made of 1 inch thick plywood.
The cabinets are trapazoidal shape measuring 630 mm height x 480mm wide x 380mm deep.
The drivers are 1x Eminence Beta 15 rated 350w rms [15 inch],
15 inch x 5 inch horn made my CTS, and CTS KSN1142 powerline piezo horn driver rated 400w.
I don't see why the manufactor has used a Eminence beta 15 with a sensitivity of 98 db,and a CTS piezo of 92 db,because the
bass driver is 6 db louder.Because of that problem,i had to go out and buy a graphic equaliser to boost the lack of treble.
I'm thinking of replacing the piezo with either an Eminence PSD2002 or APT50 comp driver plus Eminence crossover,would either of these fit on a plastic horn with a plastic 3/4 inch thread.
Also the one of the cabinets is missing a crossbrace,how easy is it to fit one,since i didn't make the cabinets.Also there is no wadding on the back panel,nor is there any ports,just 4 holes cut in the baffle.
The only thing i like about the speakers is the bass,the midrange and treble if not heavily boosted with the graphic equaliser is muffled and in the background,but if you reduce the bass[kill or cut it] it becomes weak.
i paid £300 pair new for these speakers,and i'm outraged that the manufactor,could be so stupid and forget to add a wooden crossbrace to one of the cabinets,and the moody people at the shop where i bought them,don't want anything to do with it.Are speakers supposed to come with a guarntee when new.
I know the drivers would never be covered,but manufactoring defects should be covered.I'm sick of that shop,because every thing i buy there breaks down within a few years,and the staff are very moody,crude and have very negative attutudes to make you buy something you don't really want to buy.By telling lies,saying that the speakers,have a compression driver and crossover,when it's actually a piezo and no crossover.All the mistakes are hidden inside the cabinet,i only opened the cabinet because it sounded rather dull and one baffle buzzed in a time to the bass[cos of missing centre crossbrace].
Could someone help me the best they can,I think i might as well just sell them,but i don't want to to get peanuts for them.
I paid £300, i want £100 min for them only 4 months old.Not crappy peanuts amount like £20,thats what most awful shops give ,one tenth of the price you paid.If anyone knows Cash Convertors i realy hate that shop,and they charge new prices for second hand stuff.And what puzzles me is ,how many morons buy stuff from there,when they can get the same product not much more,brand new.
Hi Bull
I can't really offer you much help - I'm just posting to warn people about the alarming number of really poor quality and overpriced loudspeakers on sale in London. I have heard so many people complain about no-name loudspeakers bought from small "DJ" shops in London - someone in halls even bought a set of "studio monitors" from a man driving around in a van! When looking at these speakers, I have seen some with really serious defects like you describe, or just a general lack of quality.
In future, buy branded gear from a well established retailer, units aimed at professional use as opposed to "DJ" use will in general be a better bet.
See ya,
Tim.
I can't really offer you much help - I'm just posting to warn people about the alarming number of really poor quality and overpriced loudspeakers on sale in London. I have heard so many people complain about no-name loudspeakers bought from small "DJ" shops in London - someone in halls even bought a set of "studio monitors" from a man driving around in a van! When looking at these speakers, I have seen some with really serious defects like you describe, or just a general lack of quality.
In future, buy branded gear from a well established retailer, units aimed at professional use as opposed to "DJ" use will in general be a better bet.
See ya,
Tim.
That's what's going on all over with very cheaply made speakers being pawned off as Mid-fi or high end.I'm in the states and I see this online at diffrent sites even ebay has tons of faux speakers for sale.At least with the guys in the white vans the van is a tip that something may be off.But you have big companies making these crappy speakers and they will have websites and brochures proclaiming how wonderful they are!You really have to read up on speakers to spot the phonies.If not then go a shop with a better reputation.
Second opinion
The found out the make printed in small print at the back of the box.
AC EURO AC115 made by Audio Concepts,rated 250w rms,8 ohm.
At least the bass drivers are Eminence Beta 15 inch,and the cabinet is made out of 1 inch thick plywood.[I can tell it's plywood cos when i removed a woofer,the wood looks like a thin strip,then a thick strip,then a thin strip and so on[sandwiched together].
Also many cabinets costing under a grand,don't have titanium comp drivers,just phonlic ones instead.Are manufactors try to make people pay more by over pricing their speakers in their shops.
Well at least it the speakers are much better compaired to by first pair i every had.My first pair were ment to look like disco speakers,but used a 12 inch woofer without a make or vented pole piece,the midrange and tweeter were the same.
They were so crappy,when i took them to a local church hall to try them loud,they started to smell of burning material,and shortly after blew completely up.
I saw some cheap-ish speakers today in the DJ MAG, pretty good ones. JBL SF-15 rated 250w rms each,with 1 inch titanium comp driver, for £650 pair.Although the wattage is a bit low for the cost,but they must be decent quality.So i'd rather have very good quality speakers with high-ish wattage, than okay quality with very high wattage.Quality as for build,design,pure sound that comes from the drivers,how detailed is the treble,and how deep and tight is the bass,and how clear and transparent is the mid.
Of course the pa/disco have to be built rugged and havea good relyibility used at high volume with a poweramp once or twice the rms wattage of the speaker,not less than the speaker,as clipping really distorts the sound,and any clipping than 'soft clipping' should be avoided.
The found out the make printed in small print at the back of the box.
AC EURO AC115 made by Audio Concepts,rated 250w rms,8 ohm.
At least the bass drivers are Eminence Beta 15 inch,and the cabinet is made out of 1 inch thick plywood.[I can tell it's plywood cos when i removed a woofer,the wood looks like a thin strip,then a thick strip,then a thin strip and so on[sandwiched together].
Also many cabinets costing under a grand,don't have titanium comp drivers,just phonlic ones instead.Are manufactors try to make people pay more by over pricing their speakers in their shops.
Well at least it the speakers are much better compaired to by first pair i every had.My first pair were ment to look like disco speakers,but used a 12 inch woofer without a make or vented pole piece,the midrange and tweeter were the same.
They were so crappy,when i took them to a local church hall to try them loud,they started to smell of burning material,and shortly after blew completely up.
I saw some cheap-ish speakers today in the DJ MAG, pretty good ones. JBL SF-15 rated 250w rms each,with 1 inch titanium comp driver, for £650 pair.Although the wattage is a bit low for the cost,but they must be decent quality.So i'd rather have very good quality speakers with high-ish wattage, than okay quality with very high wattage.Quality as for build,design,pure sound that comes from the drivers,how detailed is the treble,and how deep and tight is the bass,and how clear and transparent is the mid.
Of course the pa/disco have to be built rugged and havea good relyibility used at high volume with a poweramp once or twice the rms wattage of the speaker,not less than the speaker,as clipping really distorts the sound,and any clipping than 'soft clipping' should be avoided.
I think you are right. Those 15" drivers aren't that bad from what I've heard, and the cabinets seem to be a good starting point if they are trap shaped and really as thick as they appear.
I think you are on the right track replacing the high freq driver with something better.
I really don't have advice on what to use though!
I think you are on the right track replacing the high freq driver with something better.
I really don't have advice on what to use though!
ok, I'm a bit puzzled......
The Eminence beta 15 usually requires a BIG box.
(download WinIsd and you will see what I mean)
Also is it the new version (350w) or the old version (150w), (doesn't make any real diff to box volume) ??
very strange ! seems to be a very "lossy" box design with all those holes !!
A question though: is there any sort of cross-over inside the box.
I use the KSN1142 with a several of the of the Eminence drivers, usually 12", in small PA boxes, and have always had to damp it down a bit, its sensitivity seems to be way more than the 93 given in literature. If there is a cross-over, please try to describe it to me or even better make a diagram of it. The Ksn1142 or its big brother the 1188 (which I would use matched with a 15" woofer) work very nicely if handled properly.
The Eminence beta 15 usually requires a BIG box.
(download WinIsd and you will see what I mean)
Also is it the new version (350w) or the old version (150w), (doesn't make any real diff to box volume) ??
very strange ! seems to be a very "lossy" box design with all those holes !!
A question though: is there any sort of cross-over inside the box.
I use the KSN1142 with a several of the of the Eminence drivers, usually 12", in small PA boxes, and have always had to damp it down a bit, its sensitivity seems to be way more than the 93 given in literature. If there is a cross-over, please try to describe it to me or even better make a diagram of it. The Ksn1142 or its big brother the 1188 (which I would use matched with a 15" woofer) work very nicely if handled properly.
ps:
I have graphic eq on both my FOH and fold-backs, and generally run them pretty much dead flat unless the room has some odd quirks.. or I'm just running vocals, then I take some bass out.
I have graphic eq on both my FOH and fold-backs, and generally run them pretty much dead flat unless the room has some odd quirks.. or I'm just running vocals, then I take some bass out.
my goodness.........
I just spent some time in BB6 trying to run the box size and porting they have. Are they designed for disco or something????
there is a 6db lift in the 75-150 hz range from that box design, and if there is no x-o you have even more problems because there is a nasty peak of some 9dB at 2k.
With some work we can fix this though, but please bear with me,
I must have the circuit diagram for any cross-over they have put in please.
I just spent some time in BB6 trying to run the box size and porting they have. Are they designed for disco or something????
there is a 6db lift in the 75-150 hz range from that box design, and if there is no x-o you have even more problems because there is a nasty peak of some 9dB at 2k.
With some work we can fix this though, but please bear with me,
I must have the circuit diagram for any cross-over they have put in please.
reply
They are the old version of Eminence Beta 15, 150 Watt rms.
The new version of Eminence Beta 15 have 3 differences; 350w rms,longer voice coil,and different look to the paper cone.
The old version is made of corragated paper,dark grey in colour,the new ones are non corragated ,with black paper cone and slightly thicker paper also.
I have the old version[150w rms]
They are the old version of Eminence Beta 15, 150 Watt rms.
The new version of Eminence Beta 15 have 3 differences; 350w rms,longer voice coil,and different look to the paper cone.
The old version is made of corragated paper,dark grey in colour,the new ones are non corragated ,with black paper cone and slightly thicker paper also.
I have the old version[150w rms]
As suspected......
I didn't think there would be many commercial speakers out there yet using the new drivers.
OK, here is something you can try for a start. seal off all the vent holes, (maybe screw some squares of ply to the back of them?) and use some poly wadding or similar to about 1/2 fill the box. ie make the box into a sealed cabinet.
This will flatten out that low end peak.
See if it helps !
I didn't think there would be many commercial speakers out there yet using the new drivers.
OK, here is something you can try for a start. seal off all the vent holes, (maybe screw some squares of ply to the back of them?) and use some poly wadding or similar to about 1/2 fill the box. ie make the box into a sealed cabinet.
This will flatten out that low end peak.
See if it helps !
reply
As the piezo is a powerline driver it has an in built PTC resisitor and Tungsten bulb.
The only crossover is a 2 Watt 22 ohm resistor wired in series with the piezo.
It's real strange ,good box[18mm 13 ply plywood],good bass [Eminence Beta 15]driver.But okay-ish tweeter,no crossover,no wadding,crap damping on box,one is missing centre crossbrace,awful holes instead of ports.,Awful thin white bell wire of about 22 gauge,inside box.I guess the manufactors just bunged anything in a box,without checking it first.
I'll definatly replace the internal wire to 12 gauge ofc for the bass,16 gauge ofc for the treble.
As the piezo is a powerline driver it has an in built PTC resisitor and Tungsten bulb.
The only crossover is a 2 Watt 22 ohm resistor wired in series with the piezo.
It's real strange ,good box[18mm 13 ply plywood],good bass [Eminence Beta 15]driver.But okay-ish tweeter,no crossover,no wadding,crap damping on box,one is missing centre crossbrace,awful holes instead of ports.,Awful thin white bell wire of about 22 gauge,inside box.I guess the manufactors just bunged anything in a box,without checking it first.
I'll definatly replace the internal wire to 12 gauge ofc for the bass,16 gauge ofc for the treble.
piezo x-o for that one.....
if you go to http://home.iprimus.com.au/gradds/piezos.htm
you will find a simple but effective cross-over.
Seems someone read some notes and forgot half of it !!!
if you go to http://home.iprimus.com.au/gradds/piezos.htm
you will find a simple but effective cross-over.
Seems someone read some notes and forgot half of it !!!
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