Jamo Concert 9 Series C 91 II is a 2-way Passive Bass Reflex Bookshelf speaker by Jamo. It features a 1" Soft-Dome Tweeter and 1 x 4" Composite Woofer. The speaker has a frequency range of 65-24k Hz and a sensitivity of 86 dB. Jamo C 91 II has an MSRP of 459$ per pair but can often be found around 199$ per pair.
Room Size Suitability
The size of the room where you plan to use the Jamo C 91 II is a crucial factor in your decision. We have assessed its suitability for various room sizes based on its dimensions and maximum power output:
| Listening Environment* |
Suitability |
| Near-field | Average |
| Small Room | Good |
| Mid-size Room | Average |
| Large Room | Poor |
| Very Large Room | Bad |
(* Approximate Room sizes: Small < 100sq. ft / 9 m2, Mid-size: 100-220 sq. ft / 9-20 m2, Large 220-400 sq. ft / 20-36 m2, Very Large: > 400 sq. ft / 36 m2.
Average Floor Height: 9" / 2.7m. Typical room sizes differ from country to country, and the actual listening experience changes depending on floor height, room shape, surface materials, listening position, speaker locations, etc.)
Jamo C 91 II Lifestyle
Jamo's Concert 9 Series of Loudspeakers
C 91 II is a member of Jamo's Concert 9 series of Passive speakers. Below you can see the main specs of these speakers.
Jamo Concert 9 Series Speakers
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Frequency Response of the Jamo C 91 II Speaker
Jamo C 91 II has a Frequency response range of 65-24k Hz at ±3dB and Power Range of 50-100 watts. With a minimum frequency of 65 Hz, it is hard to expect a strong bass response from C 91 II so depending on your use case, using a subwoofer will significantly help to widen the response range.
To focus on the subwoofers that are in a similar price range with Jamo C 91 II, check out the Powered Subwoofers under $500. Alternatively, find the Full list of Powered Subwoofers regardless of the price.
Here we have a comparison of how C 91 II's Low and High frequency values compare with the average, max and min Low and High frequency values in its class.
Low Frequency
Bookshelf Speakers
High Frequency
Bookshelf Speakers
Jamo C 91 II's Composite Woofer
Jamo C 91 II's Soft-Dome Tweeter
Impedance and Sensitivity
Jamo C 91 II's nominal impedance level is
6 ohms and has a sensitivity of
86 dB.
Sensitivity
Bookshelf Speakers
Nominal Impedance of the 6 Ohms makes the Jamo Concert 9 Series C 91 II a relatively difficult to drive speaker compared to more frequently found 8 ohms speakers from nominal Impedance perspective.
Sensitivity
With a sensitivity level of only 86 dB, Jamo Concert 9 Series C 91 II is a difficult to drive speaker from Sensitivity perspective, make sure to choose an amplifier with a high output if you like listening to your music at high volume levels. You may especially have a hard time using Tube amplifiers which are traditionally very low power compared to Class A/B or Class D amps.
Check the amplifiers that are in a similar price range to the Jamo C 91 II:
Input Type
C 91 II features 5-way post type connectors. Bi-amping and Bi-wiring are not possible.
Jamo C 91 II Back View
Jamo C 91 II External Dimensions and Weight
Jamo C 91 II has external dimensions of (Height x Width x Depth) 10.4 x 6.7 x 7.5inch (265.0 x 171.0 x 191.0mm ).
Base Surface Area
Base surface area of a loudspeaker may become a determining factor when the space in your room or desk is limited.
The base area of Jamo C 91 II is approximately 326.6cm2 / 50.6inch2.
To get a better perspective on the real life size of Jamo C 91 II, let's compare it with a standard size Compact Disc which has a diameter of 4.7inch (120mm).
Jamo C 91 II Speaker Size Compared to a Compact Disc
Here we place the Jamo C 91 II virtually next to a standard width amplifier and turntable on a BDI Octave Media Cabinet to get a better idea about the size.
Jamo C 91 II Speaker next to an amplifier and turntable
WeightThe Jamo C 91 II weighs 4.10kg / 9lbs per piece. Here is a comparison of how C 91 II's weight compares with the average, max and min weights in its class.
Weight
All Bookshelf Speakers
Weight
Bookshelf Speakers under $500
How does the Jamo C 91 II compare to the Jamo Concert 9 Series C 93 II?
One of the natural alternative to the Jamo C 91 II is the C 93 II which is located one step higher in Jamo's Passive Bookshelf selection.
Here is a scaled size comparison of these two speakers to give you an idea how their external dimensions compare:
Comparison image of Jamo C 91 II and Jamo C 93 II Size and External Dimensions
Check the Detailed Comparison of Jamo C 91 II vs C 93 II for more details.
Cabinet type and Materials
Jamo C 91 II has a
Bass Reflex type cabinet and a MDF/Wood-grain finish. Bass Reflex type loudspeakers (aka Ported, Vented or Reflex Port) have enclosures that uses a port, hole or vent cut into the cabinet. Ported designs are generally more efficient than the Sealed designs.
Speaker Feet
Jamo C 91 II comes with
8 Self-adhesive rubber feet which you can use to secure your loudspeaker on the surface that you are putting on. It is always recommended to use some kind of feet under all types of speakers. Besides limiting the movement of the speakers, it also compensates for non-flat surfaces and limits the contact surface area of the speaker. Rubber based feet also help isolating the vibrations within certain frequency ranges.
Port Position
Jamo C 91 II is a rear-firing port speaker so you have to make sure you leave enough space between the back of the speaker and wall or bookshelf so that it has room to breathe.
Available colors
Jamo C 91 II is available in White Oak and Black Ash.
Wall Mounting
C 91 II has Keyhole mounting bracket that makes it possible to mount on walls and similar surfaces easily.
Does the Jamo C 91 II come with a Grille?
C 91 II comes with magnetic grilles. The purpose of the grille is to protect the delicate driver elements from external impacts while still allowing the sound to pass as clearly as possible. Since the included grille of the C 91 II is magnetic type, it is very easy to put it on and off.
Jamo C 91 II with Grille
What's in the Box of Jamo C 91 II?
Here are the items that are included inside the box of C 91 II:
2 Bookshelf loudspeakers 2 Grilles 8 Self-adhesive rubber feet 4 Self-adhesive rubber bumpers User Manual Important Safety Instructions Warranty Information
Recommended Accessories
Here is a list of accessories that we think you may need for the Jamo Concert 9 Series C 91 II.
- Speaker Cable and Connectors
- Vibration Isolators: IsoAcoustics isolators more affordable options too.
- Acoustic Panels and Treatments: Your room is as important as your stereo equipment so acoustic treatments goes a long way in improving the overall performance.
- Speaker Stands: Stands bring your bookshelf speakers to ideal height (rule of thumb is to have the tweeter level with your ear in your listening position), helps stability and acoustical isolation.
Official Brochure
Here is a link to download the official brochure for the Jamo Concert 9 Series C 91 II speaker:
Official Brochure for Jamo C 91 II
Official Product Page
Official manufacturer's product page for the Jamo Concert 9 Series C 91 II speaker can be found below:
Official Product Page for Jamo C 91 II
Warranty
5 Years of parts warranty and 5 Years of labor warranty is generally provided by the manufacturer.