Up for sale: I have fourteen pairs of brand-new-in-box Mark Audio (Markaudio) CHP-70 Gen.2 wideband drive units with the charcoal black paper cone. I mentioned these in my charcoal / black colour cone CHP sale thread here: FS Mark Audio (Markaudio) CHP-70 Gen.2 drive units (charcoal black cone) They are the same unit, the only difference being the black / charcoal colour cone.
For background interest the CHP-70 Gen.2 was developed by Markaudio in conjunction with their Japanese distributor and a number of his jazz / small club playing and listening enthusiasts. Their object was to create a 4in wideband driver with a semi 'vintage tone' that captured some of the characteristics of classic wideband units, with a lightly shelved down top end and smooth / natural midrange tone. Between the original unit and the gen.2 MA changed its graphing scales &c.: the drivers actually have similar responses, but the Gen.2 models introduced a raft of upgrades: an improved basket, a new central cap, Japanese designed low-mass coil and a new spider design providing a 12% reduction in moving mass.
Main CHP-70 Gen. 2 features:
-Usual Markaudio shallow-profile cone for consistent off-axis response
-Reinforced self-damping polymer basket
-Long-throw suspension
-Well balanced Fs, Qt, Vas to suit different types of load (works well in sealed, vented, horn & QW -two examples below in resistive vent marKen standmounts, and used as wideband midbass drivers in a pair of compact floorstanders)
-Black (charcoal colour) paper cone
-Supplied with factory gaskets and connecting hardware
I'm asking £30 per pair plus shipping (less than half normal retail)
All drivers are packaged in their original Markaudio boxes. I use sustainable FSC rated outer cardboard boxes fastened with heavy-duty packing tape. These are reinforced inside with recycled heavy-duty cardboard and packed with recycled brown / grey packing paper and high quality bubble-insulation.
Thanks as always for looking, and if you have any questions, please don't hesitate to ask.
For background interest the CHP-70 Gen.2 was developed by Markaudio in conjunction with their Japanese distributor and a number of his jazz / small club playing and listening enthusiasts. Their object was to create a 4in wideband driver with a semi 'vintage tone' that captured some of the characteristics of classic wideband units, with a lightly shelved down top end and smooth / natural midrange tone. Between the original unit and the gen.2 MA changed its graphing scales &c.: the drivers actually have similar responses, but the Gen.2 models introduced a raft of upgrades: an improved basket, a new central cap, Japanese designed low-mass coil and a new spider design providing a 12% reduction in moving mass.
Main CHP-70 Gen. 2 features:
-Usual Markaudio shallow-profile cone for consistent off-axis response
-Reinforced self-damping polymer basket
-Long-throw suspension
-Well balanced Fs, Qt, Vas to suit different types of load (works well in sealed, vented, horn & QW -two examples below in resistive vent marKen standmounts, and used as wideband midbass drivers in a pair of compact floorstanders)
-Black (charcoal colour) paper cone
-Supplied with factory gaskets and connecting hardware
I'm asking £30 per pair plus shipping (less than half normal retail)
All drivers are packaged in their original Markaudio boxes. I use sustainable FSC rated outer cardboard boxes fastened with heavy-duty packing tape. These are reinforced inside with recycled heavy-duty cardboard and packed with recycled brown / grey packing paper and high quality bubble-insulation.
Thanks as always for looking, and if you have any questions, please don't hesitate to ask.
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In terms of use, being functionally identical to the natural / parchment colour CHP-70 Gen.2, these are quite a flexible little unit, and as noted suit a range of enclosure types.
Frugel-horn Mk3 is a popular choice, as is the Pensil CHP. They'll go happily in other horn & QW variations of course. In terms of smaller bookshelf / standmount cabinets, as noted on the other thread, for vented boxes, 6 litres tuned to 65Hz gives a nicely usable, lightly damped response. If a little more size is available, 8 litres to 55Hz also works well; very good for a 4in driver. Butterworth sealed is approximately 5 litres. Dave has his marKen resistive vent designs also which work nicely.
Frugel-horn Mk3 is a popular choice, as is the Pensil CHP. They'll go happily in other horn & QW variations of course. In terms of smaller bookshelf / standmount cabinets, as noted on the other thread, for vented boxes, 6 litres tuned to 65Hz gives a nicely usable, lightly damped response. If a little more size is available, 8 litres to 55Hz also works well; very good for a 4in driver. Butterworth sealed is approximately 5 litres. Dave has his marKen resistive vent designs also which work nicely.
Depends on the preferred courier & delivery schedule. I'll fire you a PM; please forgive me if it takes a couple of hours, I had the joys of the emergency out-of-hours dentist yesterday & I need to get an appointment this morning with my regular one for some X-rays etc. which might slow me up a mite.
All the best & apologies for any short delay again
Scott
All the best & apologies for any short delay again
Scott
Another pair sold. 
Here's another pair of floorstanders that used 4 of the CHPs (interchangeable with the CHBW sister model). In this case, they were run with a simple planar super-tweeter with adjustable L-pad. Gives an idea of some of the different things that can be done with these units.
Here's another pair of floorstanders that used 4 of the CHPs (interchangeable with the CHBW sister model). In this case, they were run with a simple planar super-tweeter with adjustable L-pad. Gives an idea of some of the different things that can be done with these units.
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As mentioned above, I've dug out the box I did for these units a little while ago. Compact ML quarter-wave. Gets a little lower than the pensils, different alignment (the latter has slightly boosted midbass) & a more conventional impedance load than the near-flat TL style impedance of the pensil. But it's not shabby for a small box; Fb in the high 40Hz regions & useful output to the low 40s.
Edit: I note that the plan looks to be missing one non-critical depth dimension for the plinth. It'll be 10 1/4in.
Edit: I note that the plan looks to be missing one non-critical depth dimension for the plinth. It'll be 10 1/4in.
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1 more pair sold.
I've just dug through my storage shelves and discovered a couple more pairs, so as of time of this post, I have a total of 13 pairs of these excellent units still available. I'll be going through a couple of old external hard-discs later so will see if I still have any more unpublished designs I can post; if so, will put them up here & on my misc. designs thread over on the full-range forum.
I've just dug through my storage shelves and discovered a couple more pairs, so as of time of this post, I have a total of 13 pairs of these excellent units still available. I'll be going through a couple of old external hard-discs later so will see if I still have any more unpublished designs I can post; if so, will put them up here & on my misc. designs thread over on the full-range forum.
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Great, glad they've arrived OK & you were happy with the packing.
Found one design I did; twin driver standmount. You can run them both wide open or with the lower unit low-passed as desired. Apologies for my lack of CAD skill but the dimensions are accurate.
Found one design I did; twin driver standmount. You can run them both wide open or with the lower unit low-passed as desired. Apologies for my lack of CAD skill but the dimensions are accurate.
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...and a compact single-unit standmount added to my misc. designs thread here: https://www.diyaudio.com/forums/ful...-fostex-tb-dayton-seas-etc-2.html#post6087504
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